Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allows a user to cause a denial of service (Qemu process crash).

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4289 advisory.

  - An out-of-bounds memory access issue was found in Quick Emulator (QEMU) before 1.7.2 in the VNC display     driver. This flaw could occur while refreshing the VNC display surface area in the     'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process.
    (CVE-2017-2633)

  - Integer overflow in the load_multiboot function in hw/i386/multiboot.c in QEMU (aka Quick Emulator) allows     local guest OS users to execute arbitrary code on the host via crafted multiboot header address values,     which trigger an out-of-bounds write. (CVE-2017-14167)

  - The mode4and5 write functions in hw/display/cirrus_vga.c in Qemu allow local OS guest privileged users to     cause a denial of service (out-of-bounds write access and Qemu process crash) via vectors related to dst     calculation. (CVE-2017-15289)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5715)

  - Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized     disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5753)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis     of the data cache. (CVE-2017-5754)

  - The vga_draw_text function in Qemu allows local OS guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation.
    (CVE-2018-5683)

  - QEMU (aka Quick Emulator), when built with the VGA display emulator support, allows local guest OS     privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) via vectors     involving display update. (CVE-2017-13672)

  - Use-after-free vulnerability in the sofree function in slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance crash) by leveraging failure to properly clear     ifq_so from pending packets. (CVE-2017-13711)

  - VNC server implementation in Quick Emulator (QEMU) 2.11.0 and older was found to be vulnerable to an     unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause DoS to the server host. (CVE-2017-15124)

  - Qemu through 2.10.0 allows remote attackers to cause a memory leak by triggering slow data-channel read     operations, related to io/channel-websock.c. (CVE-2017-15268)

  - Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest     OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by     leveraging incorrect region calculation when updating VGA display. (CVE-2018-7858)

  - Systems with microprocessors utilizing speculative execution and speculative execution of memory reads     before the addresses of all prior memory writes are known may allow unauthorized disclosure of information     to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB),     Variant 4. (CVE-2018-3639)

  - The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS     users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than     mh_bss_end_addr, which triggers an out-of-bounds read or write memory access. (CVE-2018-7550)

  - m_cat in slirp/mbuf.c in Qemu has a heap-based buffer overflow via incoming fragmented datagrams.
    (CVE-2018-11806)

  - qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent) in     QEMU 2.12.50 has an integer overflow causing a g_malloc0() call to trigger a segmentation fault when     trying to allocate a large memory chunk. The vulnerability can be exploited by sending a crafted QMP     command (including guest-file-read with a large count value) to the agent via the listening socket.
    (CVE-2018-12617)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing files on a shared host     directory. A privileged user inside guest could use this flaw to access host file system beyond the shared     folder and potentially escalating their privileges on a host. (CVE-2017-7471)

  - A stack buffer overflow flaw was found in the Quick Emulator (QEMU) before 2.9 built with the Network     Block Device (NBD) client support. The flaw could occur while processing server's response to a     'NBD_OPT_LIST' request. A malicious NBD server could use this issue to crash a remote NBD client resulting     in DoS or potentially execute arbitrary code on client host with privileges of the QEMU process.
    (CVE-2017-2630)

  - Stack-based buffer overflow in hw/usb/redirect.c in QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via vectors related to logging debug messages.
    (CVE-2017-10806)

  - The address_space_write_continue function in exec.c in QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (out-of-bounds access and guest instance crash) by     leveraging use of qemu_map_ram_ptr to access guest ram block area. (CVE-2017-11334)

  - The Virtio Vring implementation in QEMU allows local OS guest users to cause a denial of service (divide-     by-zero error and QEMU process crash) by unsetting vring alignment while updating Virtio rings.
    (CVE-2017-17381)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in     mapped-file security mode. A guest user could use this flaw to escalate their privileges inside guest.
    (CVE-2017-7493)

  - hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial     of service (infinite loop and CPU consumption) via the message ring page count. (CVE-2017-8112)

  - QEMU (aka Quick Emulator), when built with MegaRAID SAS 8708EM2 Host Bus Adapter emulation support, allows     local guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process     crash) via vectors involving megasas command processing. (CVE-2017-9503)

  - QEMU (aka Quick Emulator), when built with the IDE disk and CD/DVD-ROM Emulator support, allows local     guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process crash)     by flushing an empty CDROM device drive. (CVE-2017-12809)

  - Race condition in the v9fs_xattrwalk function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local     guest OS users to obtain sensitive information from host heap memory via vectors related to reading     extended attributes. (CVE-2017-15038)

  - The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of     service issue. It could occur if a client sent large option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other     requests, resulting in DoS. (CVE-2017-15119)

  - hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-     of-bounds access. (CVE-2017-16845)

  - The cirrus_invalidate_region function in hw/display/cirrus_vga.c in Qemu allows local OS guest privileged     users to cause a denial of service (out-of-bounds array access and QEMU process crash) via vectors related     to negative pitch. (CVE-2017-18030)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash). (CVE-2017-18043)

  - Memory leak in the audio/audio.c in QEMU (aka Quick Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and stopping audio capture. (CVE-2017-8309)

  - Memory leak in the keyboard input event handlers support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host memory consumption) by rapidly generating large     keyboard events. (CVE-2017-8379)

  - Buffer overflow in the megasas_mmio_write function in Qemu 2.9.0 allows remote attackers to have     unspecified impact via unknown vectors. (CVE-2017-8380)

  - The vga display update in mis-calculated the region for the dirty bitmap snapshot in case split screen     mode is used causing a denial of service (assertion failure) in the cpu_physical_memory_snapshot_get_dirty     function. (CVE-2017-13673)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2018-4285 advisory.

  - An out-of-bounds memory access issue was found in Quick Emulator (QEMU) before 1.7.2 in the VNC display     driver. This flaw could occur while refreshing the VNC display surface area in the     'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process.
    (CVE-2017-2633)

  - Integer overflow in the load_multiboot function in hw/i386/multiboot.c in QEMU (aka Quick Emulator) allows     local guest OS users to execute arbitrary code on the host via crafted multiboot header address values,     which trigger an out-of-bounds write. (CVE-2017-14167)

  - The mode4and5 write functions in hw/display/cirrus_vga.c in Qemu allow local OS guest privileged users to     cause a denial of service (out-of-bounds write access and Qemu process crash) via vectors related to dst     calculation. (CVE-2017-15289)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5715)

  - Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized     disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5753)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis     of the data cache. (CVE-2017-5754)

  - The vga_draw_text function in Qemu allows local OS guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation.
    (CVE-2018-5683)

  - QEMU (aka Quick Emulator), when built with the VGA display emulator support, allows local guest OS     privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) via vectors     involving display update. (CVE-2017-13672)

  - Use-after-free vulnerability in the sofree function in slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance crash) by leveraging failure to properly clear     ifq_so from pending packets. (CVE-2017-13711)

  - VNC server implementation in Quick Emulator (QEMU) 2.11.0 and older was found to be vulnerable to an     unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause DoS to the server host. (CVE-2017-15124)

  - Qemu through 2.10.0 allows remote attackers to cause a memory leak by triggering slow data-channel read     operations, related to io/channel-websock.c. (CVE-2017-15268)

  - Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest     OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by     leveraging incorrect region calculation when updating VGA display. (CVE-2018-7858)

  - Systems with microprocessors utilizing speculative execution and speculative execution of memory reads     before the addresses of all prior memory writes are known may allow unauthorized disclosure of information     to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB),     Variant 4. (CVE-2018-3639)

  - The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS     users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than     mh_bss_end_addr, which triggers an out-of-bounds read or write memory access. (CVE-2018-7550)

  - m_cat in slirp/mbuf.c in Qemu has a heap-based buffer overflow via incoming fragmented datagrams.
    (CVE-2018-11806)

  - qemu-seccomp.c in QEMU might allow local OS guest users to cause a denial of service (guest crash) by     leveraging mishandling of the seccomp policy for threads other than the main thread. (CVE-2018-15746)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have unspecified other impact. (CVE-2018-17963)

  - Qemu has a Buffer Overflow in pcnet_receive in hw/net/pcnet.c because an incorrect integer data type is     used. (CVE-2018-17962)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in hw/net/rtl8139.c because an incorrect integer data     type is used. (CVE-2018-17958)

  - Qemu emulator <= 3.0.0 built with the NE2000 NIC emulation support is vulnerable to an integer overflow,     which could lead to buffer overflow issue. It could occur when receiving packets over the network. A user     inside guest could use this flaw to crash the Qemu process resulting in DoS. (CVE-2018-10839)

  - qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent) in     QEMU 2.12.50 has an integer overflow causing a g_malloc0() call to trigger a segmentation fault when     trying to allocate a large memory chunk. The vulnerability can be exploited by sending a crafted QMP     command (including guest-file-read with a large count value) to the agent via the listening socket.
    (CVE-2018-12617)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing files on a shared host     directory. A privileged user inside guest could use this flaw to access host file system beyond the shared     folder and potentially escalating their privileges on a host. (CVE-2017-7471)

  - A stack buffer overflow flaw was found in the Quick Emulator (QEMU) before 2.9 built with the Network     Block Device (NBD) client support. The flaw could occur while processing server's response to a     'NBD_OPT_LIST' request. A malicious NBD server could use this issue to crash a remote NBD client resulting     in DoS or potentially execute arbitrary code on client host with privileges of the QEMU process.
    (CVE-2017-2630)

  - Stack-based buffer overflow in hw/usb/redirect.c in QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via vectors related to logging debug messages.
    (CVE-2017-10806)

  - The address_space_write_continue function in exec.c in QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (out-of-bounds access and guest instance crash) by     leveraging use of qemu_map_ram_ptr to access guest ram block area. (CVE-2017-11334)

  - The Virtio Vring implementation in QEMU allows local OS guest users to cause a denial of service (divide-     by-zero error and QEMU process crash) by unsetting vring alignment while updating Virtio rings.
    (CVE-2017-17381)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in     mapped-file security mode. A guest user could use this flaw to escalate their privileges inside guest.
    (CVE-2017-7493)

  - hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial     of service (infinite loop and CPU consumption) via the message ring page count. (CVE-2017-8112)

  - QEMU (aka Quick Emulator), when built with MegaRAID SAS 8708EM2 Host Bus Adapter emulation support, allows     local guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process     crash) via vectors involving megasas command processing. (CVE-2017-9503)

  - QEMU (aka Quick Emulator), when built with the IDE disk and CD/DVD-ROM Emulator support, allows local     guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process crash)     by flushing an empty CDROM device drive. (CVE-2017-12809)

  - Race condition in the v9fs_xattrwalk function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local     guest OS users to obtain sensitive information from host heap memory via vectors related to reading     extended attributes. (CVE-2017-15038)

  - The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of     service issue. It could occur if a client sent large option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other     requests, resulting in DoS. (CVE-2017-15119)

  - hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-     of-bounds access. (CVE-2017-16845)

  - The cirrus_invalidate_region function in hw/display/cirrus_vga.c in Qemu allows local OS guest privileged     users to cause a denial of service (out-of-bounds array access and QEMU process crash) via vectors related     to negative pitch. (CVE-2017-18030)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash). (CVE-2017-18043)

  - Memory leak in the audio/audio.c in QEMU (aka Quick Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and stopping audio capture. (CVE-2017-8309)

  - Memory leak in the keyboard input event handlers support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host memory consumption) by rapidly generating large     keyboard events. (CVE-2017-8379)

  - Buffer overflow in the megasas_mmio_write function in Qemu 2.9.0 allows remote attackers to have     unspecified impact via unknown vectors. (CVE-2017-8380)

  - The vga display update in mis-calculated the region for the dirty bitmap snapshot in case split screen     mode is used causing a denial of service (assertion failure) in the cpu_physical_memory_snapshot_get_dirty     function. (CVE-2017-13673)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-4585 advisory.

  - An out-of-bounds memory access issue was found in Quick Emulator (QEMU) before 1.7.2 in the VNC display     driver. This flaw could occur while refreshing the VNC display surface area in the     'vnc_refresh_server_surface'. A user inside a guest could use this flaw to crash the QEMU process.
    (CVE-2017-2633)

  - Integer overflow in the load_multiboot function in hw/i386/multiboot.c in QEMU (aka Quick Emulator) allows     local guest OS users to execute arbitrary code on the host via crafted multiboot header address values,     which trigger an out-of-bounds write. (CVE-2017-14167)

  - The mode4and5 write functions in hw/display/cirrus_vga.c in Qemu allow local OS guest privileged users to     cause a denial of service (out-of-bounds write access and Qemu process crash) via vectors related to dst     calculation. (CVE-2017-15289)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5715)

  - Systems with microprocessors utilizing speculative execution and branch prediction may allow unauthorized     disclosure of information to an attacker with local user access via a side-channel analysis.
    (CVE-2017-5753)

  - Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow     unauthorized disclosure of information to an attacker with local user access via a side-channel analysis     of the data cache. (CVE-2017-5754)

  - The vga_draw_text function in Qemu allows local OS guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by leveraging improper memory address validation.
    (CVE-2018-5683)

  - QEMU (aka Quick Emulator), when built with the VGA display emulator support, allows local guest OS     privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) via vectors     involving display update. (CVE-2017-13672)

  - Use-after-free vulnerability in the sofree function in slirp/socket.c in QEMU (aka Quick Emulator) allows     attackers to cause a denial of service (QEMU instance crash) by leveraging failure to properly clear     ifq_so from pending packets. (CVE-2017-13711)

  - VNC server implementation in Quick Emulator (QEMU) 2.11.0 and older was found to be vulnerable to an     unbounded memory allocation issue, as it did not throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause DoS to the server host. (CVE-2017-15124)

  - Qemu through 2.10.0 allows remote attackers to cause a memory leak by triggering slow data-channel read     operations, related to io/channel-websock.c. (CVE-2017-15268)

  - Quick Emulator (aka QEMU), when built with the Cirrus CLGD 54xx VGA Emulator support, allows local guest     OS privileged users to cause a denial of service (out-of-bounds access and QEMU process crash) by     leveraging incorrect region calculation when updating VGA display. (CVE-2018-7858)

  - Systems with microprocessors utilizing speculative execution and speculative execution of memory reads     before the addresses of all prior memory writes are known may allow unauthorized disclosure of information     to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB),     Variant 4. (CVE-2018-3639)

  - The load_multiboot function in hw/i386/multiboot.c in Quick Emulator (aka QEMU) allows local guest OS     users to execute arbitrary code on the QEMU host via a mh_load_end_addr value greater than     mh_bss_end_addr, which triggers an out-of-bounds read or write memory access. (CVE-2018-7550)

  - m_cat in slirp/mbuf.c in Qemu has a heap-based buffer overflow via incoming fragmented datagrams.
    (CVE-2018-11806)

  - qemu-seccomp.c in QEMU might allow local OS guest users to cause a denial of service (guest crash) by     leveraging mishandling of the seccomp policy for threads other than the main thread. (CVE-2018-15746)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have unspecified other impact. (CVE-2018-17963)

  - Qemu has a Buffer Overflow in pcnet_receive in hw/net/pcnet.c because an incorrect integer data type is     used. (CVE-2018-17962)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in hw/net/rtl8139.c because an incorrect integer data     type is used. (CVE-2018-17958)

  - Qemu emulator <= 3.0.0 built with the NE2000 NIC emulation support is vulnerable to an integer overflow,     which could lead to buffer overflow issue. It could occur when receiving packets over the network. A user     inside guest could use this flaw to crash the Qemu process resulting in DoS. (CVE-2018-10839)

  - qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent) in     QEMU 2.12.50 has an integer overflow causing a g_malloc0() call to trigger a segmentation fault when     trying to allocate a large memory chunk. The vulnerability can be exploited by sending a crafted QMP     command (including guest-file-read with a large count value) to the agent via the listening socket.
    (CVE-2018-12617)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing files on a shared host     directory. A privileged user inside guest could use this flaw to access host file system beyond the shared     folder and potentially escalating their privileges on a host. (CVE-2017-7471)

  - A stack buffer overflow flaw was found in the Quick Emulator (QEMU) before 2.9 built with the Network     Block Device (NBD) client support. The flaw could occur while processing server's response to a     'NBD_OPT_LIST' request. A malicious NBD server could use this issue to crash a remote NBD client resulting     in DoS or potentially execute arbitrary code on client host with privileges of the QEMU process.
    (CVE-2017-2630)

  - Stack-based buffer overflow in hw/usb/redirect.c in QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via vectors related to logging debug messages.
    (CVE-2017-10806)

  - The address_space_write_continue function in exec.c in QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (out-of-bounds access and guest instance crash) by     leveraging use of qemu_map_ram_ptr to access guest ram block area. (CVE-2017-11334)

  - The Virtio Vring implementation in QEMU allows local OS guest users to cause a denial of service (divide-     by-zero error and QEMU process crash) by unsetting vring alignment while updating Virtio rings.
    (CVE-2017-17381)

  - Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support,     is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in     mapped-file security mode. A guest user could use this flaw to escalate their privileges inside guest.
    (CVE-2017-7493)

  - hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial     of service (infinite loop and CPU consumption) via the message ring page count. (CVE-2017-8112)

  - QEMU (aka Quick Emulator), when built with MegaRAID SAS 8708EM2 Host Bus Adapter emulation support, allows     local guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process     crash) via vectors involving megasas command processing. (CVE-2017-9503)

  - QEMU (aka Quick Emulator), when built with the IDE disk and CD/DVD-ROM Emulator support, allows local     guest OS privileged users to cause a denial of service (NULL pointer dereference and QEMU process crash)     by flushing an empty CDROM device drive. (CVE-2017-12809)

  - Race condition in the v9fs_xattrwalk function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local     guest OS users to obtain sensitive information from host heap memory via vectors related to reading     extended attributes. (CVE-2017-15038)

  - The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of     service issue. It could occur if a client sent large option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other     requests, resulting in DoS. (CVE-2017-15119)

  - hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during guest migration, leading to out-     of-bounds access. (CVE-2017-16845)

  - The cirrus_invalidate_region function in hw/display/cirrus_vga.c in Qemu allows local OS guest privileged     users to cause a denial of service (out-of-bounds array access and QEMU process crash) via vectors related     to negative pitch. (CVE-2017-18030)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash). (CVE-2017-18043)

  - Memory leak in the audio/audio.c in QEMU (aka Quick Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and stopping audio capture. (CVE-2017-8309)

  - Memory leak in the keyboard input event handlers support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host memory consumption) by rapidly generating large     keyboard events. (CVE-2017-8379)

  - Buffer overflow in the megasas_mmio_write function in Qemu 2.9.0 allows remote attackers to have     unspecified impact via unknown vectors. (CVE-2017-8380)

  - The vga display update in mis-calculated the region for the dirty bitmap snapshot in case split screen     mode is used causing a denial of service (assertion failure) in the cpu_physical_memory_snapshot_get_dirty     function. (CVE-2017-13673)

  - A flaw was found in qemu Media Transfer Protocol (MTP) before version 3.1.0. A path traversal in the in     usb_mtp_write_data function in hw/usb/dev-mtp.c due to an improper filename sanitization. When the guest     device is mounted in read-write mode, this allows to read/write arbitrary files which may lead do DoS     scenario OR possibly lead to code execution on the host. (CVE-2018-16867)

  - hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to     uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).
    (CVE-2018-20191)

  - A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and     usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying     filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical     TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this     property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU     process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS.
    (CVE-2018-16872)

  - hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe     ring element with a large num_sge value. (CVE-2018-20124)

  - QEMU can have an infinite loop in hw/rdma/vmw/pvrdma_dev_ring.c because return values are not checked (and
    -1 is mishandled). (CVE-2018-20216)

  - hw/rdma/vmw/pvrdma_cmd.c in QEMU allows attackers to cause a denial of service (NULL pointer dereference     or excessive memory allocation) in create_cq_ring or create_qp_rings. (CVE-2018-20125)

  - hw/rdma/vmw/pvrdma_cmd.c in QEMU allows create_cq and create_qp memory leaks because errors are     mishandled. (CVE-2018-20126)

  - In Qemu 3.0.0, lsi_do_msgin in hw/scsi/lsi53c895a.c allows out-of-bounds access by triggering an invalid     msg_len value. (CVE-2018-18849)

  - An OOB heap buffer r/w access issue was found in the NVM Express Controller emulation in QEMU. It could     occur in nvme_cmb_ops routines in nvme device. A guest user/process could use this flaw to crash the QEMU     process resulting in DoS or potentially run arbitrary code with privileges of the QEMU process.
    (CVE-2018-16847)

  - hw/9pfs/cofile.c and hw/9pfs/9p.c in QEMU can modify an fid path while it is being accessed by a second     thread, leading to (for example) a use-after-free outcome. (CVE-2018-19364)

  - v9fs_wstat in hw/9pfs/9p.c in QEMU allows guest OS users to cause a denial of service (crash) because of a     race condition during file renaming. (CVE-2018-19489)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the qemu-kvm packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - In libslirp 4.1.0, as used in QEMU 4.2.0, tcp_subr.c     misuses snprintf return values, leading to a buffer     overflow in later code.(CVE-2020-8608)

  - This vulnerability has been modified since it was last     analyzed by the NVD. It is awaiting reanalysis which     may result in further changes to the information     provided.(CVE-2019-11135)

  - tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in     QEMU 4.2.0, mismanages memory, as demonstrated by IRC     DCC commands in EMU_IRC. This can cause a heap-based     buffer overflow or other out-of-bounds access which can     lead to a DoS or potential execute arbitrary     code.(CVE-2020-7039)

  - ip_reass in ip_input.c in libslirp 4.0.0 has a     heap-based buffer overflow via a large packet because     it mishandles a case involving the first     fragment.(CVE-2019-14378)

  - Integer overflow in the VNC display driver in QEMU     before 2.1.0 allows attachers to cause a denial of     service (process crash) via a CLIENT_CUT_TEXT message,     which triggers an infinite loop.(CVE-2015-5239)

  - Buffer overflow in the send_control_msg function in     hw/char/virtio-serial-bus.c in QEMU before 2.4.0 allows     guest users to cause a denial of service (QEMU process     crash) via a crafted virtio control     message.(CVE-2015-5745)

  - The ne2000_receive function in hw/net/ne2000.c in QEMU     before 2.4.0.1 allows attackers to cause a denial of     service (infinite loop and instance crash) or possibly     execute arbitrary code via vectors related to receiving     packets.(CVE-2015-5278)

  - The process_tx_desc function in hw/net/e1000.c in QEMU     before 2.4.0.1 does not properly process transmit     descriptor data when sending a network packet, which     allows attackers to cause a denial of service (infinite     loop and guest crash) via unspecified     vectors.(CVE-2015-6815)

  - Heap-based buffer overflow in the ne2000_receive     function in hw/net/ne2000.c in QEMU before 2.4.0.1     allows guest OS users to cause a denial of service     (instance crash) or possibly execute arbitrary code via     vectors related to receiving packets.(CVE-2015-5279)

  - Heap-based buffer overflow in the .receive callback of     xlnx.xps-ethernetlite in QEMU (aka Quick Emulator)     allows attackers to execute arbitrary code on the QEMU     host via a large ethlite packet.(CVE-2016-7161)

  - hw/net/vmxnet3.c in QEMU 2.0.0-rc0, 1.7.1, and earlier     allows local guest users to cause a denial of service     or possibly execute arbitrary code via vectors related     to (1) RX or (2) TX queue numbers or (3) interrupt     indices. NOTE: some of these details are obtained from     third party information.(CVE-2013-4544)

  - The slirp_smb function in net/slirp.c in QEMU 2.3.0 and     earlier creates temporary files with predictable names,     which allows local users to cause a denial of service     (instantiation failure) by creating /tmp/qemu-smb.*-*     files before the program.(CVE-2015-4037)

  - hw/ide/core.c in QEMU does not properly restrict the     commands accepted by an ATAPI device, which allows     guest users to cause a denial of service or possibly     have unspecified other impact via certain IDE commands,     as demonstrated by a WIN_READ_NATIVE_MAX command to an     empty drive, which triggers a divide-by-zero error and     instance crash.(CVE-2015-6855)

  - hw/virtio/virtio.c in the Virtual Network Device     (virtio-net) support in QEMU, when big or mergeable     receive buffers are not supported, allows remote     attackers to cause a denial of service (guest network     consumption) via a flood of jumbo frames on the (1)     tuntap or (2) macvtap interface.(CVE-2015-7295)

  - The MSI-X MMIO support in hw/pci/msix.c in QEMU (aka     Quick Emulator) allows local guest OS privileged users     to cause a denial of service (NULL pointer dereference     and QEMU process crash) by leveraging failure to define     the .write method.(CVE-2015-7549)

  - The eepro100 emulator in QEMU qemu-kvm blank allows     local guest users to cause a denial of service     (application crash and infinite loop) via vectors     involving the command block list.(CVE-2015-8345)

  - Qemu, when built with VNC display driver support,     allows remote attackers to cause a denial of service     (arithmetic exception and application crash) via     crafted SetPixelFormat messages from a     client.(CVE-2015-8504)

  - The ehci_process_itd function in hw/usb/hcd-ehci.c in     QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and CPU consumption)     via a circular isochronous transfer descriptor (iTD)     list.(CVE-2015-8558)

  - Memory leak in net/vmxnet3.c in QEMU allows remote     attackers to cause a denial of service (memory     consumption).(CVE-2015-8567)

  - Memory leak in QEMU, when built with a VMWARE VMXNET3     paravirtual NIC emulator support, allows local guest     users to cause a denial of service (host memory     consumption) by trying to activate the vmxnet3 device     repeatedly.(CVE-2015-8568)

  - Stack-based buffer overflow in the     megasas_ctrl_get_info function in QEMU, when built with     SCSI MegaRAID SAS HBA emulation support, allows local     guest users to cause a denial of service (QEMU instance     crash) via a crafted SCSI controller CTRL_GET_INFO     command.(CVE-2015-8613)

  - Use-after-free vulnerability in hw/ide/ahci.c in QEMU,     when built with IDE AHCI Emulation support, allows     guest OS users to cause a denial of service (instance     crash) or possibly execute arbitrary code via an     invalid AHCI Native Command Queuing (NCQ) AIO     command.(CVE-2016-1568)

  - QEMU (aka Quick Emulator) built with the USB EHCI     emulation support is vulnerable to a null pointer     dereference flaw. It could occur when an application     attempts to write to EHCI capabilities registers. A     privileged user inside quest could use this flaw to     crash the QEMU process instance resulting in     DoS.(CVE-2016-2198)

  - The ohci_bus_start function in the USB OHCI emulation     support (hw/usb/hcd-ohci.c) in QEMU allows local guest     OS administrators to cause a denial of service (NULL     pointer dereference and QEMU process crash) via vectors     related to multiple eof_timers.(CVE-2016-2391)

  - The is_rndis function in the USB Net device emulator     (hw/usb/dev-network.c) in QEMU before 2.5.1 does not     properly validate USB configuration descriptor objects,     which allows local guest OS administrators to cause a     denial of service (NULL pointer dereference and QEMU     process crash) via vectors involving a remote NDIS     control message packet.(CVE-2016-2392)

  - Multiple integer overflows in the USB Net device     emulator (hw/usb/dev-network.c) in QEMU before 2.5.1     allow local guest OS administrators to cause a denial     of service (QEMU process crash) or obtain sensitive     host memory information via a remote NDIS control     message packet that is mishandled in the (1)     rndis_query_response, (2) rndis_set_response, or (3)     usb_net_handle_dataout function.(CVE-2016-2538)

  - The ne2000_receive function in the NE2000 NIC emulation     support (hw/net/ne2000.c) in QEMU before 2.5.1 allows     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via     crafted values for the PSTART and PSTOP registers,     involving ring buffer control.(CVE-2016-2841)

  - QEMU, when built with the Pseudo Random Number     Generator (PRNG) back-end support, allows local guest     OS users to cause a denial of service (process crash)     via an entropy request, which triggers arbitrary stack     based allocation and memory corruption.(CVE-2016-2858)

  - Buffer overflow in the stellaris_enet_receive function     in hw/net/stellaris_enet.c in QEMU, when the Stellaris     ethernet controller is configured to accept large     packets, allows remote attackers to cause a denial of     service (QEMU crash) via a large packet.(CVE-2016-4001)

  - Buffer overflow in the mipsnet_receive function in     hw/net/mipsnet.c in QEMU, when the guest NIC is     configured to accept large packets, allows remote     attackers to cause a denial of service (memory     corruption and QEMU crash) or possibly execute     arbitrary code via a packet larger than 1514     bytes.(CVE-2016-4002)

  - The ehci_advance_state function in hw/usb/hcd-ehci.c in     QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and CPU consumption)     via a circular split isochronous transfer descriptor     (siTD) list, a related issue to     CVE-2015-8558.(CVE-2016-4037)

  - The vmsvga_fifo_run function in hw/display/vmware_vga.c     in QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and QEMU process     crash) via a VGA command.(CVE-2016-4453)

  - The vmsvga_fifo_read_raw function in     hw/display/vmware_vga.c in QEMU allows local guest OS     administrators to obtain sensitive host memory     information or cause a denial of service (QEMU process     crash) by changing FIFO registers and issuing a VGA     command, which triggers an out-of-bounds     read.(CVE-2016-4454)

  - The net_tx_pkt_do_sw_fragmentation function in     hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via a     zero length for the current fragment     length.(CVE-2016-6834)

  - The vmxnet_tx_pkt_parse_headers function in     hw/net/vmxnet_tx_pkt.c in QEMU (aka Quick Emulator)     allows local guest OS administrators to cause a denial     of service (buffer over-read) by leveraging failure to     check IP header length.(CVE-2016-6835)

  - The vmxnet3_complete_packet function in     hw/net/vmxnet3.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to obtain sensitive host     memory information by leveraging failure to initialize     the txcq_descr object.(CVE-2016-6836)

  - Integer overflow in the net_tx_pkt_init function in     hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (QEMU process crash) via the maximum     fragmentation count, which triggers an unchecked     multiplication and NULL pointer     dereference.(CVE-2016-6888)

  - Directory traversal vulnerability in hw/9pfs/9p.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to access host files outside the export     path via a .. (dot dot) in an unspecified     string.(CVE-2016-7116)

  - The pvscsi_ring_pop_req_descr function in     hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator)     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) by     leveraging failure to limit process IO loop to the ring     size.(CVE-2016-7421)

  - The mcf_fec_do_tx function in hw/net/mcf_fec.c in QEMU     (aka Quick Emulator) does not properly limit the buffer     descriptor count when transmitting packets, which     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) via     vectors involving a buffer descriptor with a length of     0 and crafted values in bd.flags.(CVE-2016-7908)

  - The pcnet_rdra_addr function in hw/net/pcnet.c in QEMU     (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and QEMU process crash) by setting the (1) receive     or (2) transmit descriptor ring length to     0.(CVE-2016-7909)

  - The xhci_ring_fetch function in hw/usb/hcd-xhci.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and QEMU process crash) by leveraging failure to     limit the number of link Transfer Request Blocks (TRB)     to process.(CVE-2016-8576)

  - The serial_update_parameters function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (divide-by-zero error and QEMU process crash)     via vectors involving a value of divider greater than     baud base.(CVE-2016-8669)

  - The intel_hda_xfer function in hw/audio/intel-hda.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and CPU consumption) via an entry with the same     value for buffer length and pointer     position.(CVE-2016-8909)

  - The rtl8139_cplus_transmit function in hw/net/rtl8139.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and CPU consumption) by leveraging failure to     limit the ring descriptor count.(CVE-2016-8910)

  - Memory leak in the v9fs_xattrcreate function in     hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local     guest OS administrators to cause a denial of service     (memory consumption and QEMU process crash) via a large     number of Txattrcreate messages with the same fid     number.(CVE-2016-9102)

  - The v9fs_xattrcreate function in hw/9pfs/9p.c in QEMU     (aka Quick Emulator) allows local guest OS     administrators to obtain sensitive host heap memory     information by reading xattribute values before writing     to them.(CVE-2016-9103)

  - Multiple integer overflows in the (1) v9fs_xattr_read     and (2) v9fs_xattr_write functions in hw/9pfs/9p.c in     QEMU (aka Quick Emulator) allow local guest OS     administrators to cause a denial of service (QEMU     process crash) via a crafted offset, which triggers an     out-of-bounds access.(CVE-2016-9104)

  - Memory leak in the v9fs_link function in hw/9pfs/9p.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (memory     consumption) via vectors involving a reference to the     source fid object.(CVE-2016-9105)

  - Memory leak in the v9fs_write function in hw/9pfs/9p.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (memory     consumption) by leveraging failure to free an IO     vector.(CVE-2016-9106)

  - Race condition in QEMU in Xen allows local x86 HVM     guest OS administrators to gain privileges by changing     certain data on shared rings, aka a 'double fetch'     vulnerability.(CVE-2016-9381)

  - Quick Emulator (Qemu) built with the USB redirector     usb-guest support is vulnerable to a memory leakage     flaw. It could occur while destroying the USB     redirector in 'usbredir_handle_destroy'. A guest     user/process could use this issue to leak host memory,     resulting in DoS for a host.(CVE-2016-9907)

  - Quick Emulator (Qemu) built with the USB EHCI Emulation     support is vulnerable to a memory leakage issue. It     could occur while processing packet data in     'ehci_init_transfer'. A guest user/process could use     this issue to leak host memory, resulting in DoS for a     host.(CVE-2016-9911)

  - Stack-based buffer overflow in hw/usb/redirect.c in     QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via     vectors related to logging debug     messages.(CVE-2017-10806)

  - The dhcp_decode function in slirp/bootp.c in QEMU (aka     Quick Emulator) allows local guest OS users to cause a     denial of service (out-of-bounds read and QEMU process     crash) via a crafted DHCP options     string.(CVE-2017-11434)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash).(CVE-2017-18043)

  - Memory leak in the serial_exit_core function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption and QEMU process     crash) via a large number of device unplug     operations.(CVE-2017-5579)

  - The xhci_kick_epctx function in hw/usb/hcd-xhci.c in     QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (infinite     loop and QEMU process crash) via vectors related to     control transfer descriptor sequence.(CVE-2017-5973)

  - Memory leak in the audio/audio.c in QEMU (aka Quick     Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and     stopping audio capture.(CVE-2017-8309)

  - Memory leak in QEMU (aka Quick Emulator), when built     with IDE AHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the AHCI     device.(CVE-2017-9373)

  - Memory leak in QEMU (aka Quick Emulator), when built     with USB EHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the     device.(CVE-2017-9374)

  - Qemu emulator <= 3.0.0 built with the NE2000 NIC     emulation support is vulnerable to an integer overflow,     which could lead to buffer overflow issue. It could     occur when receiving packets over the network. A user     inside guest could use this flaw to crash the Qemu     process resulting in DoS.(CVE-2018-10839)

  - qemu-seccomp.c in QEMU might allow local OS guest users     to cause a denial of service (guest crash) by     leveraging mishandling of the seccomp policy for     threads other than the main thread.(CVE-2018-15746)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in     hw/net/rtl8139.c because an incorrect integer data type     is used.(CVE-2018-17958)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts     packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have     unspecified other impact.(CVE-2018-17963)

  - In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a     heap-based buffer overflow.(CVE-2019-6778)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the qemu-kvm packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - Race condition in QEMU in Xen allows local x86 HVM     guest OS administrators to gain privileges by changing     certain data on shared rings, aka a 'double fetch'     vulnerability.(CVE-2016-9381)

  - The ohci_bus_start function in the USB OHCI emulation     support (hw/usb/hcd-ohci.c) in QEMU allows local guest     OS administrators to cause a denial of service (NULL     pointer dereference and QEMU process crash) via vectors     related to multiple eof_timers.(CVE-2016-2391)

  - qemu_deliver_packet_iov in net/net.c in Qemu accepts     packet sizes greater than INT_MAX, which allows     attackers to cause a denial of service or possibly have     unspecified other impact.(CVE-2018-17963)

  - Memory leak in the serial_exit_core function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption and QEMU process     crash) via a large number of device unplug     operations.(CVE-2017-5579)

  - Memory leak in QEMU (aka Quick Emulator), when built     with IDE AHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the AHCI     device.(CVE-2017-9373)

  - Microarchitectural Store Buffer Data Sampling (MSBDS):
    Store buffers on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12126)

  - Microarchitectural Data Sampling Uncacheable Memory     (MDSUM): Uncacheable memory on some microprocessors     utilizing speculative execution may allow an     authenticated user to potentially enable information     disclosure via a side channel with local access. A list     of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2019-11091)

  - Microarchitectural Fill Buffer Data Sampling (MFBDS):
    Fill buffers on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12130)

  - Microarchitectural Load Port Data Sampling (MLPDS):
    Load ports on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12127)

  - Directory traversal vulnerability in hw/9pfs/9p.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to access host files outside the export     path via a .. (dot dot) in an unspecified     string.(CVE-2016-7116)

  - QEMU, when built with the Pseudo Random Number     Generator (PRNG) back-end support, allows local guest     OS users to cause a denial of service (process crash)     via an entropy request, which triggers arbitrary stack     based allocation and memory corruption.(CVE-2016-2858)

  - hw/ide/core.c in QEMU does not properly restrict the     commands accepted by an ATAPI device, which allows     guest users to cause a denial of service or possibly     have unspecified other impact via certain IDE commands,     as demonstrated by a WIN_READ_NATIVE_MAX command to an     empty drive, which triggers a divide-by-zero error and     instance crash.(CVE-2015-6855)

  - The slirp_smb function in net/slirp.c in QEMU 2.3.0 and     earlier creates temporary files with predictable names,     which allows local users to cause a denial of service     (instantiation failure) by creating /tmp/qemu-smb.*-*     files before the program.(CVE-2015-4037)

  - The MSI-X MMIO support in hw/pci/msix.c in QEMU (aka     Quick Emulator) allows local guest OS privileged users     to cause a denial of service (NULL pointer dereference     and QEMU process crash) by leveraging failure to define     the .write method.(CVE-2015-7549)

  - The ne2000_receive function in the NE2000 NIC emulation     support (hw/net/ne2000.c) in QEMU before 2.5.1 allows     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via     crafted values for the PSTART and PSTOP registers,     involving ring buffer control.(CVE-2016-2841)

  - The mcf_fec_do_tx function in hw/net/mcf_fec.c in QEMU     (aka Quick Emulator) does not properly limit the buffer     descriptor count when transmitting packets, which     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) via     vectors involving a buffer descriptor with a length of     0 and crafted values in bd.flags.(CVE-2016-7908)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash).(CVE-2017-18043)

  - The xhci_kick_epctx function in hw/usb/hcd-xhci.c in     QEMU (aka Quick Emulator) allows local guest OS     privileged users to cause a denial of service (infinite     loop and QEMU process crash) via vectors related to     control transfer descriptor sequence.(CVE-2017-5973)

  - Memory leak in QEMU (aka Quick Emulator), when built     with USB EHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the     device.(CVE-2017-9374)

  - Use-after-free vulnerability in hw/ide/ahci.c in QEMU,     when built with IDE AHCI Emulation support, allows     guest OS users to cause a denial of service (instance     crash) or possibly execute arbitrary code via an     invalid AHCI Native Command Queuing (NCQ) AIO     command.(CVE-2016-1568)

  - Buffer overflow in the stellaris_enet_receive function     in hw/net/stellaris_enet.c in QEMU, when the Stellaris     ethernet controller is configured to accept large     packets, allows remote attackers to cause a denial of     service (QEMU crash) via a large packet.(CVE-2016-4001)

  - Buffer overflow in the mipsnet_receive function in     hw/net/mipsnet.c in QEMU, when the guest NIC is     configured to accept large packets, allows remote     attackers to cause a denial of service (memory     corruption and QEMU crash) or possibly execute     arbitrary code via a packet larger than 1514     bytes.(CVE-2016-4002)

  - The pvscsi_ring_pop_req_descr function in     hw/scsi/vmw_pvscsi.c in QEMU (aka Quick Emulator)     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) by     leveraging failure to limit process IO loop to the ring     size.(CVE-2016-7421)

  - Quick Emulator (Qemu) built with the USB redirector     usb-guest support is vulnerable to a memory leakage     flaw. It could occur while destroying the USB     redirector in 'usbredir_handle_destroy'. A guest     user/process could use this issue to leak host memory,     resulting in DoS for a host.(CVE-2016-9907)

  - qemu-seccomp.c in QEMU might allow local OS guest users     to cause a denial of service (guest crash) by     leveraging mishandling of the seccomp policy for     threads other than the main thread.(CVE-2018-15746)

  - Stack-based buffer overflow in hw/usb/redirect.c in     QEMU (aka Quick Emulator) allows local guest OS users     to cause a denial of service (QEMU process crash) via     vectors related to logging debug     messages.(CVE-2017-10806)

  - The dhcp_decode function in slirp/bootp.c in QEMU (aka     Quick Emulator) allows local guest OS users to cause a     denial of service (out-of-bounds read and QEMU process     crash) via a crafted DHCP options     string.(CVE-2017-11434)

  - Memory leak in the audio/audio.c in QEMU (aka Quick     Emulator) allows remote attackers to cause a denial of     service (memory consumption) by repeatedly starting and     stopping audio capture.(CVE-2017-8309)

  - Qemu emulator <= 3.0.0 built with the NE2000 NIC     emulation support is vulnerable to an integer overflow,     which could lead to buffer overflow issue. It could     occur when receiving packets over the network. A user     inside guest could use this flaw to crash the Qemu     process resulting in DoS.(CVE-2018-10839)

  - Qemu has a Buffer Overflow in rtl8139_do_receive in     hw/net/rtl8139.c because an incorrect integer data type     is used.(CVE-2018-17958)

  - In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a     heap-based buffer overflow.(CVE-2019-6778)

  - The vmxnet_tx_pkt_parse_headers function in     hw/net/vmxnet_tx_pkt.c in QEMU (aka Quick Emulator)     allows local guest OS administrators to cause a denial     of service (buffer over-read) by leveraging failure to     check IP header length.(CVE-2016-6835)

  - Memory leak in the v9fs_xattrcreate function in     hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local     guest OS administrators to cause a denial of service     (memory consumption and QEMU process crash) via a large     number of Txattrcreate messages with the same fid     number.(CVE-2016-9102)

  - The v9fs_xattrcreate function in hw/9pfs/9p.c in QEMU     (aka Quick Emulator) allows local guest OS     administrators to obtain sensitive host heap memory     information by reading xattribute values before writing     to them.(CVE-2016-9103)

  - Multiple integer overflows in the (1) v9fs_xattr_read     and (2) v9fs_xattr_write functions in hw/9pfs/9p.c in     QEMU (aka Quick Emulator) allow local guest OS     administrators to cause a denial of service (QEMU     process crash) via a crafted offset, which triggers an     out-of-bounds access.(CVE-2016-9104)

  - Memory leak in the v9fs_link function in hw/9pfs/9p.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (memory     consumption) via vectors involving a reference to the     source fid object.(CVE-2016-9105)

  - Memory leak in the v9fs_write function in hw/9pfs/9p.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (memory     consumption) by leveraging failure to free an IO     vector.(CVE-2016-9106)

  - Quick Emulator (Qemu) built with the USB EHCI Emulation     support is vulnerable to a memory leakage issue. It     could occur while processing packet data in     'ehci_init_transfer'. A guest user/process could use     this issue to leak host memory, resulting in DoS for a     host.(CVE-2016-9911)

  - The net_tx_pkt_do_sw_fragmentation function in     hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via a     zero length for the current fragment     length.(CVE-2016-6834)

  - The vmxnet3_complete_packet function in     hw/net/vmxnet3.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to obtain sensitive host     memory information by leveraging failure to initialize     the txcq_descr object.(CVE-2016-6836)

  - Integer overflow in the net_tx_pkt_init function in     hw/net/net_tx_pkt.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (QEMU process crash) via the maximum     fragmentation count, which triggers an unchecked     multiplication and NULL pointer     dereference.(CVE-2016-6888)

  - The pcnet_rdra_addr function in hw/net/pcnet.c in QEMU     (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and QEMU process crash) by setting the (1) receive     or (2) transmit descriptor ring length to     0.(CVE-2016-7909)

  - The xhci_ring_fetch function in hw/usb/hcd-xhci.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and QEMU process crash) by leveraging failure to     limit the number of link Transfer Request Blocks (TRB)     to process.(CVE-2016-8576)

  - The serial_update_parameters function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS administrators to cause a denial of     service (divide-by-zero error and QEMU process crash)     via vectors involving a value of divider greater than     baud base.(CVE-2016-8669)

  - The intel_hda_xfer function in hw/audio/intel-hda.c in     QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and CPU consumption) via an entry with the same     value for buffer length and pointer     position.(CVE-2016-8909)

  - The rtl8139_cplus_transmit function in hw/net/rtl8139.c     in QEMU (aka Quick Emulator) allows local guest OS     administrators to cause a denial of service (infinite     loop and CPU consumption) by leveraging failure to     limit the ring descriptor count.(CVE-2016-8910)

  - Stack-based buffer overflow in the     megasas_ctrl_get_info function in QEMU, when built with     SCSI MegaRAID SAS HBA emulation support, allows local     guest users to cause a denial of service (QEMU instance     crash) via a crafted SCSI controller CTRL_GET_INFO     command.(CVE-2015-8613)

  - QEMU (aka Quick Emulator) built with the USB EHCI     emulation support is vulnerable to a null pointer     dereference flaw. It could occur when an application     attempts to write to EHCI capabilities registers. A     privileged user inside quest could use this flaw to     crash the QEMU process instance resulting in     DoS.(CVE-2016-2198)

  - The is_rndis function in the USB Net device emulator     (hw/usb/dev-network.c) in QEMU before 2.5.1 does not     properly validate USB configuration descriptor objects,     which allows local guest OS administrators to cause a     denial of service (NULL pointer dereference and QEMU     process crash) via vectors involving a remote NDIS     control message packet.(CVE-2016-2392)

  - The ehci_advance_state function in hw/usb/hcd-ehci.c in     QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and CPU consumption)     via a circular split isochronous transfer descriptor     (siTD) list, a related issue to     CVE-2015-8558.(CVE-2016-4037)

  - The vmsvga_fifo_run function in hw/display/vmware_vga.c     in QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and QEMU process     crash) via a VGA command.(CVE-2016-4453)

  - The vmsvga_fifo_read_raw function in     hw/display/vmware_vga.c in QEMU allows local guest OS     administrators to obtain sensitive host memory     information or cause a denial of service (QEMU process     crash) by changing FIFO registers and issuing a VGA     command, which triggers an out-of-bounds     read.(CVE-2016-4454)

  - hw/virtio/virtio.c in the Virtual Network Device     (virtio-net) support in QEMU, when big or mergeable     receive buffers are not supported, allows remote     attackers to cause a denial of service (guest network     consumption) via a flood of jumbo frames on the (1)     tuntap or (2) macvtap interface.(CVE-2015-7295)

  - The eepro100 emulator in QEMU qemu-kvm blank allows     local guest users to cause a denial of service     (application crash and infinite loop) via vectors     involving the command block list.(CVE-2015-8345)

  - Qemu, when built with VNC display driver support,     allows remote attackers to cause a denial of service     (arithmetic exception and application crash) via     crafted SetPixelFormat messages from a     client.(CVE-2015-8504)

  - The ehci_process_itd function in hw/usb/hcd-ehci.c in     QEMU allows local guest OS administrators to cause a     denial of service (infinite loop and CPU consumption)     via a circular isochronous transfer descriptor (iTD)     list.(CVE-2015-8558)

  - Memory leak in net/vmxnet3.c in QEMU allows remote     attackers to cause a denial of service (memory     consumption).(CVE-2015-8567)

  - Memory leak in QEMU, when built with a VMWARE VMXNET3     paravirtual NIC emulator support, allows local guest     users to cause a denial of service (host memory     consumption) by trying to activate the vmxnet3 device     repeatedly.(CVE-2015-8568)

  - Buffer overflow in the pxa2xx_ssp_load function in     hw/arm/pxa2xx.c in QEMU before 1.7.2 allows remote     attackers to cause a denial of service or possibly     execute arbitrary code via a crafted s->rx_level value     in a savevm image.(CVE-2013-4533)

  - hw/net/vmxnet3.c in QEMU 2.0.0-rc0, 1.7.1, and earlier     allows local guest users to cause a denial of service     or possibly execute arbitrary code via vectors related     to (1) RX or (2) TX queue numbers or (3) interrupt     indices. NOTE: some of these details are obtained from     third party information.(CVE-2013-4544)

  - Multiple integer overflows in the USB Net device     emulator (hw/usb/dev-network.c) in QEMU before 2.5.1     allow local guest OS administrators to cause a denial     of service (QEMU process crash) or obtain sensitive     host memory information via a remote NDIS control     message packet that is mishandled in the (1)     rndis_query_response, (2) rndis_set_response, or (3)     usb_net_handle_dataout function.(CVE-2016-2538)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the qemu-kvm packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a     heap-based buffer overflow.(CVE-2019-6778)

  - The MSI-X MMIO support in hw/pci/msix.c in QEMU (aka     Quick Emulator) allows local guest OS privileged users     to cause a denial of service (NULL pointer dereference     and QEMU process crash) by leveraging failure to define     the .write method.(CVE-2015-7549)

  - The ne2000_receive function in the NE2000 NIC emulation     support (hw/net/ne2000.c) in QEMU before 2.5.1 allows     local guest OS administrators to cause a denial of     service (infinite loop and QEMU process crash) via     crafted values for the PSTART and PSTOP registers,     involving ring buffer control.(CVE-2016-2841)

  - Memory leak in QEMU (aka Quick Emulator), when built     with USB EHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the     device.(CVE-2017-9374)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash).(CVE-2017-18043)

  - Memory leak in the serial_exit_core function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption and QEMU process     crash) via a large number of device unplug     operations.(CVE-2017-5579)

  - The slirp_smb function in net/slirp.c in QEMU 2.3.0 and     earlier creates temporary files with predictable names,     which allows local users to cause a denial of service     (instantiation failure) by creating /tmp/qemu-smb.*-*     files before the program.(CVE-2015-4037)

  - The mcf_fec_do_tx function in hw/net/mcf_fec.c in QEMU     (aka Quick Emulator) does not properly limit the buffer     descriptor count when transmitting packets, which     allows local guest OS administrators to cause a denial     of service (infinite loop and QEMU process crash) via     vectors involving a buffer descriptor with a length of     0 and crafted values in bd.flags.(CVE-2016-7908)

  - hw/net/vmxnet3.c in QEMU 2.0.0-rc0, 1.7.1, and earlier     allows local guest users to cause a denial of service     or possibly execute arbitrary code via vectors related     to (1) RX or (2) TX queue numbers or (3) interrupt     indices. NOTE: some of these details are obtained from     third party information.(CVE-2013-4544)

  - Multiple integer overflows in the USB Net device     emulator (hw/usb/dev-network.c) in QEMU before 2.5.1     allow local guest OS administrators to cause a denial     of service (QEMU process crash) or obtain sensitive     host memory information via a remote NDIS control     message packet that is mishandled in the (1)     rndis_query_response, (2) rndis_set_response, or (3)     usb_net_handle_dataout function.(CVE-2016-2538)

  - Qemu emulator <= 3.0.0 built with the NE2000 NIC     emulation support is vulnerable to an integer overflow,     which could lead to buffer overflow issue. It could     occur when receiving packets over the network. A user     inside guest could use this flaw to crash the Qemu     process resulting in DoS.(CVE-2018-10839)

  - Memory leak in QEMU (aka Quick Emulator), when built     with IDE AHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the AHCI     device.(CVE-2017-9373)

  - tcp_emu in slirp/tcp_subr.c (aka slirp/src/tcp_subr.c)     in QEMU 3.0.0 uses uninitialized data in an snprintf     call, leading to Information disclosure.(CVE-2019-9824)

  - QEMU (aka Quick Emulator), when built with MegaRAID SAS     8708EM2 Host Bus Adapter emulation support, allows     local guest OS privileged users to cause a denial of     service (NULL pointer dereference and QEMU process     crash) via vectors involving megasas command     processing.(CVE-2017-9503)

  - Buffer overflow in hw/ide/ahci.c in QEMU before 1.7.2     allows remote attackers to cause a denial of service     and possibly execute arbitrary code via vectors related     to migrating ports.(CVE-2013-4526)

  - Buffer overflow in hw/ssi/pl022.c in QEMU before 1.7.2     allows remote attackers to cause a denial of service or     possibly execute arbitrary code via crafted     tx_fifo_head and rx_fifo_head values in a savevm     image.(CVE-2013-4530)

  - Multiple buffer overflows in the tsc210x_load function     in hw/input/tsc210x.c in QEMU before 1.7.2 might allow     remote attackers to execute arbitrary code via a     crafted (1) precision, (2) nextprecision, (3) function,     or (4) nextfunction value in a savevm     image.(CVE-2013-4539)

  - Buffer overflow in scoop_gpio_handler_update in QEMU     before 1.7.2 might allow remote attackers to execute     arbitrary code via a large (1) prev_level, (2)     gpio_level, or (3) gpio_dir value in a savevm     image.(CVE-2013-4540)

  - The sdhci_sdma_transfer_multi_blocks function in     hw/sd/sdhci.c in QEMU (aka Quick Emulator) allows local     OS guest privileged users to cause a denial of service     (infinite loop and QEMU process crash) via vectors     involving the transfer mode register during multi block     transfer.(CVE-2017-5987)

  - Microarchitectural Store Buffer Data Sampling (MSBDS):
    Store buffers on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12126)

  - Microarchitectural Load Port Data Sampling (MLPDS):
    Load ports on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12127)

  - Microarchitectural Fill Buffer Data Sampling (MFBDS):
    Fill buffers on some microprocessors utilizing     speculative execution may allow an authenticated user     to potentially enable information disclosure via a side     channel with local access. A list of impacted products     can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2018-12130)

  - Microarchitectural Data Sampling Uncacheable Memory     (MDSUM): Uncacheable memory on some microprocessors     utilizing speculative execution may allow an     authenticated user to potentially enable information     disclosure via a side channel with local access. A list     of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/docu     ments/corporate-information/SA00233-microcode-update-gu     idance_05132019.pdf(CVE-2019-11091)

  - interface_release_resource in hw/display/qxl.c in QEMU     4.0.0 has a NULL pointer dereference.(CVE-2019-12155)

  - Heap-based buffer overflow in the .receive callback of     xlnx.xps-ethernetlite in QEMU (aka Quick Emulator)     allows attackers to execute arbitrary code on the QEMU     host via a large ethlite packet.(CVE-2016-7161)

  - Heap-based buffer overflow in the ne2000_receive     function in hw/net/ne2000.c in QEMU before 2.4.0.1     allows guest OS users to cause a denial of service     (instance crash) or possibly execute arbitrary code via     vectors related to receiving packets.(CVE-2015-5279)

  - The sdhci_sdma_transfer_multi_blocks function in     hw/sd/sdhci.c in QEMU (aka Quick Emulator) allows local     guest OS privileged users to cause a denial of service     (out-of-bounds heap access and crash) or execute     arbitrary code on the QEMU host via vectors involving     the data transfer length.(CVE-2017-5667)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the qemu packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - An integer overflow issue was found in the NE200 NIC     emulation. It could occur while receiving packets from     the network, if the size value was greater than     INT_MAX. Such overflow would lead to stack buffer     overflow issue. A user inside guest could use this flaw     to crash the QEMU process, resulting in DoS scenario.
    (CVE-2018-10839)

  - qmp_guest_file_read in qga/commands-posix.c and     qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent)     in QEMU 2.12.50 has an integer overflow causing a     g_malloc0() call to trigger a segmentation fault when     trying to allocate a large memory chunk. The     vulnerability can be exploited by sending a crafted QMP     command (including guest-file-read with a large count     value) to the agent via the listening     socket.(CVE-2018-12617)

  - Qemu before version 2.9 is vulnerable to an improper     link following when built with the VirtFS. A privileged     user inside guest could use this flaw to access host     file system beyond the shared folder and potentially     escalating their privileges on a host. (CVE-2016-9602)

  - Quick Emulator (QEMU), compiled with the PC System     Emulator with multiboot feature support, is vulnerable     to an OOB r/w memory access issue. The issue could     occur while loading a kernel image during the guest     boot, if mh_load_end_addr address is greater than the     mh_bss_end_addr address. A user or process could use     this flaw to potentially achieve arbitrary code     execution on a host.(CVE-2018-7550)

  - An out-of-bounds read access issue was found in the VGA     display emulator built into the Quick emulator (QEMU).
    It could occur while reading VGA memory to update     graphics display. A privileged user/process inside     guest could use this flaw to crash the QEMU process on     the host resulting in denial of service     situation.(CVE-2017-13672)

  - An assert failure issue was found in the VGA display     emulator built into the Quick emulator (QEMU). It could     occur while updating graphics display, due to     miscalculating region for dirty bitmap snapshot in     split screen mode. A privileged user/process inside     guest could use this flaw to crash the QEMU process on     the host resulting in denial of service.
    (CVE-2017-13673)

  - The Network Block Device (NBD) server in Quick Emulator     (QEMU), is vulnerable to a denial of service issue. It     could occur if a client sent large option requests,     making the server waste CPU time on reading up to 4GB     per request. A client could use this flaw to keep the     NBD server from serving other requests, resulting in     DoS.(CVE-2017-15119)

  - QEMU (aka Quick Emulator) before 2.9.0, when built with     the USB OHCI Emulation support, allows local guest OS     users to cause a denial of service (infinite loop) by     leveraging an incorrect return value, a different     vulnerability than CVE-2017-6505.(CVE-2017-9330)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash). (CVE-2017-18043)

  - VNC server implementation in Quick Emulator (QEMU) was     found to be vulnerable to an unbounded memory     allocation issue, as it did not throttle the     framebuffer updates sent to its client. If the client     did not consume these updates, VNC server allocates     growing memory to hold onto this data. A malicious     remote VNC client could use this flaw to cause DoS to     the server host.(CVE-2017-15124)

  - A memory leakage issue was found in the I/O channels     websockets implementation of the Quick Emulator (QEMU).
    It could occur while sending screen updates to a     client, which is slow to read and process them further.
    A privileged guest user could use this flaw to cause a     denial of service on the host and/or potentially crash     the QEMU process instance on the host.(CVE-2017-15268)

  - Quick Emulator (QEMU), compiled with the PC System     Emulator with multiboot feature support, is vulnerable     to an OOB r/w memory access issue. The issue could     occur due to an integer overflow while loading a kernel     image during a guest boot. A user or process could use     this flaw to potentially achieve arbitrary code     execution on a host.(CVE-2017-14167)

  - Memory leak in QEMU (aka Quick Emulator), when built     with IDE AHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the AHCI     device.(CVE-2017-9373)

  - Memory leak in the serial_exit_core function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption and QEMU process     crash) via a large number of device unplug     operations.(CVE-2017-5579)

  - ** DISPUTED ** The disas_insn function in     target/i386/translate.c in QEMU before 2.9.0, when TCG     mode without hardware acceleration is used, does not     limit the instruction size, which allows local users to     gain privileges by creating a modified basic block that     injects code into a setuid program, as demonstrated by     procmail. NOTE: the vendor has stated 'this bug does     not violate any security guarantees QEMU     makes.'(CVE-2017-8284)

  - Memory leak in the keyboard input event handlers     support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host     memory consumption) by rapidly generating large     keyboard events.(CVE-2017-8379)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the qemu-kvm packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - An integer overflow issue was found in the NE200 NIC     emulation. It could occur while receiving packets from     the network, if the size value was greater than     INT_MAX. Such overflow would lead to stack buffer     overflow issue. A user inside guest could use this flaw     to crash the QEMU process, resulting in DoS scenario.
    (CVE-2018-10839)

  - qmp_guest_file_read in qga/commands-posix.c and     qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent)     in QEMU 2.12.50 has an integer overflow causing a     g_malloc0() call to trigger a segmentation fault when     trying to allocate a large memory chunk. The     vulnerability can be exploited by sending a crafted QMP     command (including guest-file-read with a large count     value) to the agent via the listening     socket.(CVE-2018-12617)

  - Qemu before version 2.9 is vulnerable to an improper     link following when built with the VirtFS. A privileged     user inside guest could use this flaw to access host     file system beyond the shared folder and potentially     escalating their privileges on a host. (CVE-2016-9602)

  - Quick Emulator (QEMU), compiled with the PC System     Emulator with multiboot feature support, is vulnerable     to an OOB r/w memory access issue. The issue could     occur while loading a kernel image during the guest     boot, if mh_load_end_addr address is greater than the     mh_bss_end_addr address. A user or process could use     this flaw to potentially achieve arbitrary code     execution on a host.(CVE-2018-7550)

  - An out-of-bounds read access issue was found in the VGA     display emulator built into the Quick emulator (QEMU).
    It could occur while reading VGA memory to update     graphics display. A privileged user/process inside     guest could use this flaw to crash the QEMU process on     the host resulting in denial of service     situation.(CVE-2017-13672)

  - An assert failure issue was found in the VGA display     emulator built into the Quick emulator (QEMU). It could     occur while updating graphics display, due to     miscalculating region for dirty bitmap snapshot in     split screen mode. A privileged user/process inside     guest could use this flaw to crash the QEMU process on     the host resulting in denial of service.
    (CVE-2017-13673)

  - The Network Block Device (NBD) server in Quick Emulator     (QEMU), is vulnerable to a denial of service issue. It     could occur if a client sent large option requests,     making the server waste CPU time on reading up to 4GB     per request. A client could use this flaw to keep the     NBD server from serving other requests, resulting in     DoS.(CVE-2017-15119)

  - QEMU (aka Quick Emulator) before 2.9.0, when built with     the USB OHCI Emulation support, allows local guest OS     users to cause a denial of service (infinite loop) by     leveraging an incorrect return value, a different     vulnerability than CVE-2017-6505.(CVE-2017-9330)

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash). (CVE-2017-18043)

  - VNC server implementation in Quick Emulator (QEMU) was     found to be vulnerable to an unbounded memory     allocation issue, as it did not throttle the     framebuffer updates sent to its client. If the client     did not consume these updates, VNC server allocates     growing memory to hold onto this data. A malicious     remote VNC client could use this flaw to cause DoS to     the server host.(CVE-2017-15124)

  - A memory leakage issue was found in the I/O channels     websockets implementation of the Quick Emulator (QEMU).
    It could occur while sending screen updates to a     client, which is slow to read and process them further.
    A privileged guest user could use this flaw to cause a     denial of service on the host and/or potentially crash     the QEMU process instance on the host.(CVE-2017-15268)

  - Quick Emulator (QEMU), compiled with the PC System     Emulator with multiboot feature support, is vulnerable     to an OOB r/w memory access issue. The issue could     occur due to an integer overflow while loading a kernel     image during a guest boot. A user or process could use     this flaw to potentially achieve arbitrary code     execution on a host.(CVE-2017-14167)

  - Memory leak in QEMU (aka Quick Emulator), when built     with IDE AHCI Emulation support, allows local guest OS     privileged users to cause a denial of service (memory     consumption) by repeatedly hot-unplugging the AHCI     device.(CVE-2017-9373)

  - Memory leak in the serial_exit_core function in     hw/char/serial.c in QEMU (aka Quick Emulator) allows     local guest OS privileged users to cause a denial of     service (host memory consumption and QEMU process     crash) via a large number of device unplug     operations.(CVE-2017-5579)

  - ** DISPUTED ** The disas_insn function in     target/i386/translate.c in QEMU before 2.9.0, when TCG     mode without hardware acceleration is used, does not     limit the instruction size, which allows local users to     gain privileges by creating a modified basic block that     injects code into a setuid program, as demonstrated by     procmail. NOTE: the vendor has stated 'this bug does     not violate any security guarantees QEMU     makes.'(CVE-2017-8284)

  - Memory leak in the keyboard input event handlers     support in QEMU (aka Quick Emulator) allows local guest     OS privileged users to cause a denial of service (host     memory consumption) by rapidly generating large     keyboard events.(CVE-2017-8379)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the qemu-kvm packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - Integer overflow in the macro ROUND_UP (n, d) in Quick     Emulator (Qemu) allows a user to cause a denial of     service (Qemu process crash).(CVE-2017-18043)

  - QEMU (aka Quick Emulator) before 2.9.0, when built with     the USB OHCI Emulation support, allows local guest OS     users to cause a denial of service (infinite loop) by     leveraging an incorrect return value, a different     vulnerability than CVE-2017-6505.(CVE-2017-9330)

  - VNC server implementation in Quick Emulator (QEMU)     2.11.0 and older was found to be vulnerable to an     unbounded memory allocation issue, as it did not     throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server     allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to     cause DoS to the server host.(CVE-2017-15124)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were found in qemu, a fast processor emulator :

CVE-2015-8666

Heap-based buffer overflow in QEMU when built with the Q35-chipset-based PC system emulator

CVE-2016-2198

NULL pointer dereference in ehci_caps_write in the USB EHCI support that may result in denial of service

CVE-2016-6833

Use after free while writing in the vmxnet3 device that could be used to cause a denial of service

CVE-2016-6835

Buffer overflow in vmxnet_tx_pkt_parse_headers() in vmxnet3 device that could result in denial of service

CVE-2016-8576

Infinite loop vulnerability in xhci_ring_fetch in the USB xHCI support

CVE-2016-8667 / CVE-2016-8669

Divide by zero errors in set_next_tick in the JAZZ RC4030 chipset emulator, and in serial_update_parameters of some serial devices, that could result in denial of service

CVE-2016-9602

Improper link following with VirtFS

CVE-2016-9603

Heap buffer overflow via vnc connection in the Cirrus CLGD 54xx VGA emulator support

CVE-2016-9776

Infinite loop while receiving data in the ColdFire Fast Ethernet Controller emulator

CVE-2016-9907

Memory leakage in the USB redirector usb-guest support 

CVE-2016-9911

Memory leakage in ehci_init_transfer in the USB EHCI support

CVE-2016-9914 / CVE-2016-9915 / CVE-2016-9916

Plan 9 File System (9pfs): add missing cleanup operation in FileOperations, in the handle backend and in the proxy backend driver

CVE-2016-9921 / CVE-2016-9922

Divide by zero in cirrus_do_copy in the Cirrus CLGD 54xx VGA Emulator support 

CVE-2016-10155

Memory leak in hw/watchdog/wdt_i6300esb.c allowing local guest OS privileged users to cause a denial of service via a large number of device unplug operations.

CVE-2017-2615 / CVE-2017-2620 / CVE-2017-18030 / CVE-2018-5683 / CVE-2017-7718

Out-of-bounds access issues in the Cirrus CLGD 54xx VGA emulator support, that could result in denial of service

CVE-2017-5525 / CVE-2017-5526

Memory leakage issues in the ac97 and es1370 device emulation

CVE-2017-5579

Most memory leakage in the 16550A UART emulation

CVE-2017-5667

Out-of-bounds access during multi block SDMA transfer in the SDHCI emulation support.

CVE-2017-5715

Mitigations against the Spectre v2 vulnerability. For more information please refer to https://www.qemu.org/2018/01/04/spectre/

CVE-2017-5856

Memory leak in the MegaRAID SAS 8708EM2 Host Bus Adapter emulation support

CVE-2017-5973 / CVE-2017-5987 / CVE-2017-6505

Infinite loop issues in the USB xHCI, in the transfer mode register of the SDHCI protocol, and the USB ohci_service_ed_list

CVE-2017-7377

9pfs: host memory leakage via v9fs_create

CVE-2017-7493

Improper access control issues in the host directory sharing via 9pfs support.

CVE-2017-7980

Heap-based buffer overflow in the Cirrus VGA device that could allow local guest OS users to execute arbitrary code or cause a denial of service

CVE-2017-8086

9pfs: host memory leakage via v9pfs_list_xattr

CVE-2017-8112

Infinite loop in the VMWare PVSCSI emulation

CVE-2017-8309 / CVE-2017-8379

Host memory leakage issues via the audio capture buffer and the keyboard input event handlers 

CVE-2017-9330

Infinite loop due to incorrect return value in USB OHCI that may result in denial of service

CVE-2017-9373 / CVE-2017-9374

Host memory leakage during hot unplug in IDE AHCI and USB emulated devices that could result in denial of service

CVE-2017-9503

NULL pointer dereference while processing megasas command

CVE-2017-10806

Stack buffer overflow in USB redirector

CVE-2017-10911

Xen disk may leak stack data via response ring

CVE-2017-11434

Out-of-bounds read while parsing Slirp/DHCP options

CVE-2017-14167

Out-of-bounds access while processing multiboot headers that could result in the execution of arbitrary code

CVE-2017-15038

9pfs: information disclosure when reading extended attributes

CVE-2017-15289

Out-of-bounds write access issue in the Cirrus graphic adaptor that could result in denial of service

CVE-2017-16845

Information leak in the PS/2 mouse and keyboard emulation support that could be exploited during instance migration 

CVE-2017-18043

Integer overflow in the macro ROUND_UP (n, d) that could result in denial of service

CVE-2018-7550

Incorrect handling of memory during multiboot that could may result in execution of arbitrary code

For Debian 8 'Jessie', these problems have been fixed in version 1:2.1+dfsg-12+deb8u7.

We recommend that you upgrade your qemu packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities were discovered in qemu, a fast processor emulator.

  - CVE-2017-15038     Tuomas Tynkkynen discovered an information leak in 9pfs.

  - CVE-2017-15119     Eric Blake discovered that the NBD server insufficiently     restricts large option requests, resulting in denial of     service.

  - CVE-2017-15124     Daniel Berrange discovered that the integrated VNC     server insufficiently restricted memory allocation,     which could result in denial of service.

  - CVE-2017-15268     A memory leak in websockets support may result in denial     of service.

  - CVE-2017-15289     Guoxiang Niu discovered an OOB write in the emulated     Cirrus graphics adaptor which could result in denial of     service.

  - CVE-2017-16845     Cyrille Chatras discovered an information leak in PS/2     mouse and keyboard emulation which could be exploited     during instance migration.

  - CVE-2017-17381     Dengzhan Heyuandong Bijunhua and Liweichao discovered     that an implementation error in the virtio vring     implementation could result in denial of service.

  - CVE-2017-18043     Eric Blake discovered an integer overflow in an     internally used macro which could result in denial of     service.

  - CVE-2018-5683     Jiang Xin and Lin ZheCheng discovered an OOB memory     access in the emulated VGA adaptor which could result in     denial of service.

  - CVE-2018-7550     Cyrille Chatras discovered that an OOB memory write when     using multiboot could result in the execution of     arbitrary code.

This update also backports a number of mitigations against the Spectre v2 vulnerability affecting modern CPUs (CVE-2017-5715 ). For additional information please refer to https://www.qemu.org/2018/01/04/spectre/

The remote host is affected by the vulnerability described in GLSA-201804-08 (QEMU: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in QEMU. Please review the       CVE identifiers referenced below for details.
  Impact :

    An attacker could execute arbitrary code, cause a Denial of Service       condition, or obtain sensitive information.
  Workaround :

    There is no known workaround at this time.

This update for qemu fixes the following issues: This update has the next round of Spectre v2 related patches, which now integrate with corresponding changes in libvirt. (CVE-2017-5715 bsc#1068032) The January 2018 release of qemu initially addressed the Spectre v2 vulnerability for KVM guests by exposing the spec-ctrl feature for all x86 vcpu types, which was the quick and dirty approach, but not the proper solution. We replaced our initial patch by the patches from upstream. This update defines spec_ctrl and ibpb cpu feature flags as well as new cpu models which are clones of existing models with either
-IBRS or -IBPB added to the end of the model name. These new vcpu models explicitly include the new feature(s), whereas the feature flags can be added to the cpu parameter as with other features. In short, for continued Spectre v2 protection, ensure that either the appropriate cpu feature flag is added to the QEMU command-line, or one of the new cpu models is used. Although migration from older versions is supported, the new cpu features won't be properly exposed to the guest until it is restarted with the cpu features explicitly added. A reboot is insufficient. A warning patch is added which attempts to detect a migration from a qemu version which had the quick and dirty fix (it only detects certain cases, but hopefully is helpful.) For additional information on Spectre v2 as it relates to QEMU, see:
https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/ A patch is added to continue to detect Spectre v2 mitigation features (as shown by cpuid), and if found provide that feature to guests, even if running on older KVM (kernel) versions which do not yet expose that feature to QEMU. (bsc#1082276) These two patches will be removed when we can reasonably assume everyone is running with the appropriate updates. Also security fixes for the following CVE issues are included :

  - CVE-2017-15119: The Network Block Device (NBD) server in     Quick Emulator (QEMU), was vulnerable to a denial of     service issue. It could occur if a client sent large     option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this     flaw to keep the NBD server from serving other requests,     resulting in DoS. (bsc#1070144)

  - CVE-2017-15124: VNC server implementation in Quick     Emulator (QEMU) was found to be vulnerable to an     unbounded memory allocation issue, as it did not     throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server     allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause     DoS to the server host. (bsc#1073489)

  - CVE-2017-16845: The PS2 driver in Qemu did not validate     'rptr' and 'count' values during guest migration,     leading to out-of-bounds access. (bsc#1068613)

  - CVE-2017-17381: The Virtio Vring implementation in QEMU     allowed local OS guest users to cause a denial of     service (divide-by-zero error and QEMU process crash) by     unsetting vring alignment while updating Virtio rings.
    (bsc#1071228)

  - CVE-2017-18030: A problem in the Cirrus driver in Qemu     allowed local OS guest privileged users to cause a     denial of service (out-of-bounds array access and QEMU     process crash) via vectors related to negative pitch.
    (bsc#1076179)

  - CVE-2017-18043: Integer overflow in the macro ROUND_UP     (n, d) in Quick Emulator (Qemu) allowed a user to cause     a denial of service (Qemu process crash). (bsc#1076775)

  - CVE-2018-5683: The VGA driver in Qemu allowed local OS     guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by     leveraging improper memory address validation.
    (bsc#1076114)

  - CVE-2018-7550: The multiboot functionality in Quick     Emulator (aka QEMU) allowed local guest OS users to     execute arbitrary code on the QEMU host via an     out-of-bounds read or write memory access. (bsc#1083291)     Also the following bugs were fixed :

  - Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which     we've carried since the initial Spectre v2 patch was     added. EDX bit 27 of CPUID Leaf 07H, Sub-leaf 0 provides     status on STIBP, and not the PRED_CMD MSR. Exposing the     STIBP CPUID feature bit to the guest is wrong in     general, since the VM doesn't directly control the     scheduling of physical hyperthreads. This is left     strictly to the L0 hypervisor.

  - Spectre fixes for IBM Z series by providing more hw     features to guests (bsc#1076814)

  - Pre-add group kvm for qemu-tools (bsc#1040202)

  - the qemu-tools package also needs a prerequire of group     management tools, from the shadow package. (bsc#1085598)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for qemu fixes the following issues :

This update has the next round of Spectre v2 related patches, which now integrate with corresponding changes in libvirt. (CVE-2017-5715 bsc#1068032)

The January 2018 release of qemu initially addressed the Spectre v2 vulnerability for KVM guests by exposing the spec-ctrl feature for all x86 vcpu types, which was the quick and dirty approach, but not the proper solution.

We replaced our initial patch by the patches from upstream.

This update defines spec_ctrl and ibpb cpu feature flags as well as new cpu models which are clones of existing models with either -IBRS or -IBPB added to the end of the model name. These new vcpu models explicitly include the new feature(s), whereas the feature flags can be added to the cpu parameter as with other features. In short, for continued Spectre v2 protection, ensure that either the appropriate cpu feature flag is added to the QEMU command-line, or one of the new cpu models is used.

Although migration from older versions is supported, the new cpu features won't be properly exposed to the guest until it is restarted with the cpu features explicitly added. A reboot is insufficient.

A warning patch is added which attempts to detect a migration from a qemu version which had the quick and dirty fix (it only detects certain cases, but hopefully is helpful.) For additional information on Spectre v2 as it relates to QEMU, see:
https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/

A patch is added to continue to detect Spectre v2 mitigation features (as shown by cpuid), and if found provide that feature to guests, even if running on older KVM (kernel) versions which do not yet expose that feature to QEMU. (bsc#1082276)

These two patches will be removed when we can reasonably assume everyone is running with the appropriate updates.

Spectre fixes for IBM Z Series were included by providing more hw features to guests (bsc#1076813)

Also security fixes for the following CVE issues are included :

  - CVE-2017-17381: The Virtio Vring implementation in QEMU     allowed local OS guest users to cause a denial of     service (divide-by-zero error and QEMU process crash) by     unsetting vring alignment while updating Virtio rings.
    (bsc#1071228)

  - CVE-2017-16845: The PS2 driver in Qemu did not validate     'rptr' and 'count' values during guest migration,     leading to out-of-bounds access. (bsc#1068613)

  - CVE-2017-15119: The Network Block Device (NBD) server in     Quick Emulator (QEMU), was vulnerable to a denial of     service issue. It could occur if a client sent large     option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this     flaw to keep the NBD server from serving other requests,     resulting in DoS. (bsc#1070144)

  - CVE-2017-18043: Integer overflow in the macro ROUND_UP     (n, d) in Quick Emulator (Qemu) allowed a user to cause     a denial of service (Qemu process crash). (bsc#1076775)

  - CVE-2018-5683: The VGA driver in Qemu allowed local OS     guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by     leveraging improper memory address validation.
    (bsc#1076114)

  - CVE-2018-7550: The multiboot functionality in Quick     Emulator (aka QEMU) allowed local guest OS users to     execute arbitrary code on the QEMU host via an     out-of-bounds read or write memory access. (bsc#1083291)

  - CVE-2017-15124: VNC server implementation in Quick     Emulator (QEMU) was found to be vulnerable to an     unbounded memory allocation issue, as it did not     throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server     allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause     DoS to the server host. (bsc#1073489)

Additional bugs fixed :

  - Fix pcihp for 1.6 and older machine types (bsc#1074572)

  - Fix packaging dependencies (coreutils) for qemu-ksm     package (bsc#1040202)

This update was imported from the SUSE:SLE-12-SP3:Update update project.

This update for qemu fixes the following issues: This update has the next round of Spectre v2 related patches, which now integrate with corresponding changes in libvirt. (CVE-2017-5715 bsc#1068032) The January 2018 release of qemu initially addressed the Spectre v2 vulnerability for KVM guests by exposing the spec-ctrl feature for all x86 vcpu types, which was the quick and dirty approach, but not the proper solution. We replaced our initial patch by the patches from upstream. This update defines spec_ctrl and ibpb cpu feature flags as well as new cpu models which are clones of existing models with either
-IBRS or -IBPB added to the end of the model name. These new vcpu models explicitly include the new feature(s), whereas the feature flags can be added to the cpu parameter as with other features. In short, for continued Spectre v2 protection, ensure that either the appropriate cpu feature flag is added to the QEMU command-line, or one of the new cpu models is used. Although migration from older versions is supported, the new cpu features won't be properly exposed to the guest until it is restarted with the cpu features explicitly added. A reboot is insufficient. A warning patch is added which attempts to detect a migration from a qemu version which had the quick and dirty fix (it only detects certain cases, but hopefully is helpful.) For additional information on Spectre v2 as it relates to QEMU, see:
https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/ A patch is added to continue to detect Spectre v2 mitigation features (as shown by cpuid), and if found provide that feature to guests, even if running on older KVM (kernel) versions which do not yet expose that feature to QEMU. (bsc#1082276) These two patches will be removed when we can reasonably assume everyone is running with the appropriate updates. Spectre fixes for IBM Z Series were included by providing more hw features to guests (bsc#1076813) Also security fixes for the following CVE issues are included :

  - CVE-2017-17381: The Virtio Vring implementation in QEMU     allowed local OS guest users to cause a denial of     service (divide-by-zero error and QEMU process crash) by     unsetting vring alignment while updating Virtio rings.
    (bsc#1071228)

  - CVE-2017-16845: The PS2 driver in Qemu did not validate     'rptr' and 'count' values during guest migration,     leading to out-of-bounds access. (bsc#1068613)

  - CVE-2017-15119: The Network Block Device (NBD) server in     Quick Emulator (QEMU), was vulnerable to a denial of     service issue. It could occur if a client sent large     option requests, making the server waste CPU time on     reading up to 4GB per request. A client could use this     flaw to keep the NBD server from serving other requests,     resulting in DoS. (bsc#1070144)

  - CVE-2017-18043: Integer overflow in the macro ROUND_UP     (n, d) in Quick Emulator (Qemu) allowed a user to cause     a denial of service (Qemu process crash). (bsc#1076775)

  - CVE-2018-5683: The VGA driver in Qemu allowed local OS     guest privileged users to cause a denial of service     (out-of-bounds read and QEMU process crash) by     leveraging improper memory address validation.
    (bsc#1076114)

  - CVE-2018-7550: The multiboot functionality in Quick     Emulator (aka QEMU) allowed local guest OS users to     execute arbitrary code on the QEMU host via an     out-of-bounds read or write memory access. (bsc#1083291)

  - CVE-2017-15124: VNC server implementation in Quick     Emulator (QEMU) was found to be vulnerable to an     unbounded memory allocation issue, as it did not     throttle the framebuffer updates sent to its client. If     the client did not consume these updates, VNC server     allocates growing memory to hold onto this data. A     malicious remote VNC client could use this flaw to cause     DoS to the server host. (bsc#1073489) Additional bugs     fixed :

  - Fix pcihp for 1.6 and older machine types (bsc#1074572)

  - Fix packaging dependencies (coreutils) for qemu-ksm     package (bsc#1040202)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

USN-3575-1 fixed vulnerabilities in QEMU. The fix for CVE-2017-11334 caused a regression in Xen environments. This update removes the problematic fix pending further investigation.

We apologize for the inconvenience.

Original advisory details :

It was discovered that QEMU incorrectly handled guest ram. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-11334) David Buchanan discovered that QEMU incorrectly handled the VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. (CVE-2017-13672) Thomas Garnier discovered that QEMU incorrectly handled multiboot. An attacker could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-14167) Tuomas Tynkkynen discovered that QEMU incorrectly handled VirtFS directory sharing. An attacker could use this issue to obtain sensitive information from host memory. (CVE-2017-15038) Eric Blake discovered that QEMU incorrectly handled memory in the NBD server. An attacker could use this issue to cause the NBD server to crash, resulting in a denial of service. This issue only affected Ubuntu 17.10.
(CVE-2017-15118) Eric Blake discovered that QEMU incorrectly handled certain options to the NBD server. An attacker could use this issue to cause the NBD server to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2017-15119) Daniel Berrange discovered that QEMU incorrectly handled the VNC server. A remote attacker could possibly use this issue to consume memory, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. (CVE-2017-15124) Carl Brassey discovered that QEMU incorrectly handled certain websockets. A remote attacker could possibly use this issue to consume memory, resulting in a denial of service. This issue only affected Ubuntu 17.10.
(CVE-2017-15268) Guoxiang Niu discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-15289) Cyrille Chatras discovered that QEMU incorrectly handled certain PS2 values during migration. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-16845) It was discovered that QEMU incorrectly handled the Virtio Vring implementation. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-17381) Eric Blake discovered that QEMU incorrectly handled certain rounding operations. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-18043) Jiang Xin and Lin ZheCheng discovered that QEMU incorrectly handled the VGA device.
A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2018-5683).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

It was discovered that QEMU incorrectly handled guest ram. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-11334)

David Buchanan discovered that QEMU incorrectly handled the VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. (CVE-2017-13672)

Thomas Garnier discovered that QEMU incorrectly handled multiboot. An attacker could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-14167)

Tuomas Tynkkynen discovered that QEMU incorrectly handled VirtFS directory sharing. An attacker could use this issue to obtain sensitive information from host memory. (CVE-2017-15038)

Eric Blake discovered that QEMU incorrectly handled memory in the NBD server. An attacker could use this issue to cause the NBD server to crash, resulting in a denial of service. This issue only affected Ubuntu 17.10. (CVE-2017-15118)

Eric Blake discovered that QEMU incorrectly handled certain options to the NBD server. An attacker could use this issue to cause the NBD server to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-15119)

Daniel Berrange discovered that QEMU incorrectly handled the VNC server. A remote attacker could possibly use this issue to consume memory, resulting in a denial of service. This issue was only addressed in Ubuntu 17.10. (CVE-2017-15124)

Carl Brassey discovered that QEMU incorrectly handled certain websockets. A remote attacker could possibly use this issue to consume memory, resulting in a denial of service. This issue only affected Ubuntu 17.10. (CVE-2017-15268)

Guoxiang Niu discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
(CVE-2017-15289)

Cyrille Chatras discovered that QEMU incorrectly handled certain PS2 values during migration. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-16845)

It was discovered that QEMU incorrectly handled the Virtio Vring implementation. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-17381)

Eric Blake discovered that QEMU incorrectly handled certain rounding operations. An attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-18043)

Jiang Xin and Lin ZheCheng discovered that QEMU incorrectly handled the VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service.
(CVE-2018-5683).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
180858	Oracle Linux 7 : qemu (ELSA-2018-4289)	Nessus	Oracle Linux Local Security Checks	critical
180778	Oracle Linux 7 : qemu (ELSA-2018-4285)	Nessus	Oracle Linux Local Security Checks	critical
180740	Oracle Linux 7 : qemu (ELSA-2019-4585)	Nessus	Oracle Linux Local Security Checks	critical
135559	EulerOS 2.0 SP3 : qemu-kvm (EulerOS-SA-2020-1430)	Nessus	Huawei Local Security Checks	critical
131585	EulerOS 2.0 SP2 : qemu-kvm (EulerOS-SA-2019-2431)	Nessus	Huawei Local Security Checks	critical
130689	EulerOS 2.0 SP5 : qemu-kvm (EulerOS-SA-2019-2227)	Nessus	Huawei Local Security Checks	critical
124947	EulerOS Virtualization 3.0.1.0 : qemu (EulerOS-SA-2019-1444)	Nessus	Huawei Local Security Checks	high
124908	EulerOS Virtualization for ARM 64 3.0.1.0 : qemu-kvm (EulerOS-SA-2019-1405)	Nessus	Huawei Local Security Checks	high
117556	EulerOS Virtualization 2.5.0 : qemu-kvm (EulerOS-SA-2018-1247)	Nessus	Huawei Local Security Checks	high
117351	Debian DLA-1497-1 : qemu security update (Spectre)	Nessus	Debian Local Security Checks	critical
110208	Debian DSA-4213-1 : qemu - security update (Spectre)	Nessus	Debian Local Security Checks	critical
108929	GLSA-201804-08 : QEMU: Multiple vulnerabilities (Spectre)	Nessus	Gentoo Local Security Checks	critical
108686	SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2018:0831-1) (Spectre)	Nessus	SuSE Local Security Checks	critical
108576	openSUSE Security Update : qemu (openSUSE-2018-291) (Spectre)	Nessus	SuSE Local Security Checks	critical
108533	SUSE SLED12 / SLES12 Security Update : qemu (SUSE-SU-2018:0762-1) (Spectre)	Nessus	SuSE Local Security Checks	critical
107145	Ubuntu 14.04 LTS / 16.04 LTS : QEMU regression (USN-3575-2)	Nessus	Ubuntu Local Security Checks	critical
106927	Ubuntu 14.04 LTS / 16.04 LTS : QEMU vulnerabilities (USN-3575-1)	Nessus	Ubuntu Local Security Checks	critical

Detections

Analytics

CVE-2017-18043

medium

Tenable Plugins

critical

critical

critical

critical

critical

critical

high

high

high

critical

critical

critical

critical

critical

critical

critical

critical