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.

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 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.

An update for qemu-kvm-ma is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-ma packages provide the user-space component for running virtual machines that use KVM on the IBM z Systems, IBM Power, and 64-bit ARM architectures.

The following packages have been upgraded to a later upstream version:
qemu-kvm-ma (2.12.0). (BZ#1562219)

Security Fix(es) :

* Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

This issue was discovered by Daniel Berrange (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.

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.

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

  - 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)

  - 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)

  - An industry-wide issue was found in the way many modern     microprocessor designs have implemented speculative     execution of Load i1/4+ Store instructions (a commonly     used performance optimization). It relies on the     presence of a precisely-defined instruction sequence in     the privileged code as well as the fact that memory     read from address to which a recent memory write has     occurred may see an older value and subsequently cause     an update into the microprocessor's data cache even for     speculatively executed instructions that never actually     commit (retire). As a result, an unprivileged attacker     could use this flaw to read privileged memory by     conducting targeted cache side-channel attacks.
    (CVE-2018-3639)

  - 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)

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.

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)

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)

A use-after-free issue was found in the Slirp networking implementation of the Quick emulator (QEMU). It occurs when a Socket referenced from multiple packets is freed while responding to a message. A user/process could use this flaw to crash the QEMU process on the host resulting in denial of service.(CVE-2017-13711 )

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)

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)

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks.(CVE-2018-3639)

An out-of-bounds read access issue was found in the VGA emulator of QEMU. It could occur in vga_draw_text routine, while updating display area for a vnc client. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS.(CVE-2018-5683)

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/

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

  - 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)

  - 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)

  - 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)

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 :

  - 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)

  - 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)

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.

Security Fix(es) :

  - Qemu: vga: OOB read access during display update     (CVE-2017-13672)

  - Qemu: Slirp: use-after-free when sending response     (CVE-2017-13711)

  - Qemu: memory exhaustion through framebuffer update     request message in VNC server (CVE-2017-15124)

  - Qemu: I/O: potential memory exhaustion via websock     connection to VNC (CVE-2017-15268)

  - Qemu: Out-of-bounds read in vga_draw_text routine     (CVE-2018-5683)

Additional Changes :

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es) :

* Qemu: vga: OOB read access during display update (CVE-2017-13672)

* Qemu: Slirp: use-after-free when sending response (CVE-2017-13711)

* Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)

* Qemu: I/O: potential memory exhaustion via websock connection to VNC (CVE-2017-15268)

* Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank David Buchanan for reporting CVE-2017-13672; Wjjzhang (Tencent.com) for reporting CVE-2017-13711;
and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683. The CVE-2017-15124 issue was discovered by Daniel Berrange (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.

From Red Hat Security Advisory 2018:0816 :

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section.

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es) :

* Qemu: vga: OOB read access during display update (CVE-2017-13672)

* Qemu: Slirp: use-after-free when sending response (CVE-2017-13711)

* Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)

* Qemu: I/O: potential memory exhaustion via websock connection to VNC (CVE-2017-15268)

* Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank David Buchanan for reporting CVE-2017-13672; Wjjzhang (Tencent.com) for reporting CVE-2017-13711;
and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683. The CVE-2017-15124 issue was discovered by Daniel Berrange (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.

An update for qemu-kvm-rhev is now available for Red Hat Virtualization 4 for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm-rhev packages provide the user-space component for running virtual machines that use KVM in environments managed by Red Hat products.

The following packages have been upgraded to a later upstream version:
qemu-kvm-rhev (2.10.0). (BZ#1470749)

Security Fix(es) :

* Qemu: stack-based buffer overflow in NBD server triggered via long export name (CVE-2017-15118)

* Qemu: DoS via large option request (CVE-2017-15119)

* Qemu: vga: OOB read access during display update (CVE-2017-13672)

* Qemu: vga: reachable assert failure during display update (CVE-2017-13673)

* Qemu: Slirp: use-after-free when sending response (CVE-2017-13711)

* Qemu: memory exhaustion through framebuffer update request message in VNC server (CVE-2017-15124)

* Qemu: I/O: potential memory exhaustion via websock connection to VNC (CVE-2017-15268)

* Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank David Buchanan for reporting CVE-2017-13672 and CVE-2017-13673; Wjjzhang (Tencent.com) for reporting CVE-2017-13711; and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683. The CVE-2017-15118 and CVE-2017-15119 issues were discovered by Eric Blake (Red Hat) and the CVE-2017-15124 issue was discovered by Daniel Berrange (Red Hat).

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
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
118521	RHEL 7 : qemu-kvm-ma (RHSA-2018:3062)	Nessus	Red Hat Local Security Checks	high
117556	EulerOS Virtualization 2.5.0 : qemu-kvm (EulerOS-SA-2018-1247)	Nessus	Huawei Local Security Checks	high
110865	EulerOS 2.0 SP3 : qemu-kvm (EulerOS-SA-2018-1201)	Nessus	Huawei Local Security Checks	high
110457	Amazon Linux AMI : qemu-kvm (ALAS-2018-1034) (Spectre)	Nessus	Amazon Linux Local Security Checks	high
110451	Amazon Linux 2 : qemu-kvm (ALAS-2018-1034) (Spectre)	Nessus	Amazon Linux Local Security Checks	high
110208	Debian DSA-4213-1 : qemu - security update (Spectre)	Nessus	Debian Local Security Checks	critical
110148	EulerOS 2.0 SP1 : qemu-kvm (EulerOS-SA-2018-1144)	Nessus	Huawei Local Security Checks	high
109511	EulerOS 2.0 SP2 : qemu-kvm (EulerOS-SA-2018-1113)	Nessus	Huawei Local Security Checks	high
109458	Scientific Linux Security Update : qemu-kvm on SL7.x x86_64 (20180410)	Nessus	Scientific Linux Local Security Checks	high
109372	CentOS 7 : qemu-kvm (CESA-2018:0816)	Nessus	CentOS Local Security Checks	high
109106	Oracle Linux 7 : qemu-kvm (ELSA-2018-0816)	Nessus	Oracle Linux Local Security Checks	high
109070	RHEL 7 : Virtualization (RHSA-2018:1104)	Nessus	Red Hat Local Security Checks	critical
108986	RHEL 7 : qemu-kvm (RHSA-2018:0816)	Nessus	Red Hat Local Security Checks	high
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-2017-15124

high

Tenable Plugins

critical

critical

critical

high

high

high

high

high

high

high

critical

high

high

high

high

high

critical

high

critical

critical

critical

critical

critical

critical