A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in     versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function     while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-35503)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs
    when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A
    malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata,
    resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the
    host. (CVE-2021-3682)

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in
    versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function
    while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the
    host, resulting in a denial of service. The highest threat from this vulnerability is to system
    availability. (CVE-2020-35503)

  - A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could
    occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the
    floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on
    the host resulting in DoS scenario, or potential information leakage from the host memory. (CVE-2021-3507)

  - Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions
    up to and including 6.0. They exist in contrib/vhost-user-gpu/vhost-user-gpu.c and contrib/vhost-user-
    gpu/virgl.c due to improper release of memory (i.e., free) after effective lifetime. (CVE-2021-3544)

  - An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of
    QEMU in versions up to and including 6.0. The flaw exists in virgl_cmd_get_capset_info() in contrib/vhost-
    user-gpu/virgl.c and could occur due to the read of uninitialized memory. A malicious guest could exploit
    this issue to leak memory from the host. (CVE-2021-3545)

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

  - 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 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)

  - hw/pci/msix.c in QEMU 4.2.0 allows guest OS users to trigger an out-of-bounds access via a crafted address     in an msi-x mmio operation. (CVE-2020-13754)

  - hw/pci/pci.c in QEMU 4.2.0 allows guest OS users to trigger an out-of-bounds access by providing an     address near the end of the PCI configuration space. (CVE-2020-13791)

  - In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer     dereference. (CVE-2020-15469)

  - QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e     packet with the data's address set to the e1000e's MMIO address. (CVE-2020-15859)

  - pci_change_irq_level in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference because     pci_get_bus() might not return a valid pointer. (CVE-2020-25742)

  - hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check     before an ide_cancel_dma_sync call. (CVE-2020-25743)

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in     versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function     while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-35503)

  - An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It     may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A     privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.
    (CVE-2021-20203)

  - A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator     of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw     allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a     denial of service. The highest threat from this vulnerability is to system availability. (CVE-2021-20255)

  - An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing     transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid     values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The     highest threat from this vulnerability is to system availability. (CVE-2021-20257)

  - A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could     occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the     floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on     the host resulting in DoS scenario, or potential information leakage from the host memory. (CVE-2021-3507)

  - An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions     prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-     bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this     flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the     host. (CVE-2021-3713)

  - A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the     descriptor's address belongs to the non direct access region, due to num_buffers being set after the     virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a     denial of service condition, or potentially execute code on the host with the privileges of the QEMU     process. (CVE-2021-3748)

  - A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the     Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be     written to the controller's registers and trigger undesirable actions (such as reset) while the device is     still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could     use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or     potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects     QEMU versions before 7.0.0. (CVE-2021-3750)

  - An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE     SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious     guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.
    (CVE-2021-3930)

  - A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc()     function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer     overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or     potentially execute arbitrary code within the context of the QEMU process. (CVE-2021-4206)

  - A flaw was found in the virtio-net device of QEMU. This flaw was inadvertently introduced with the fix for     CVE-2021-3748, which forgot to unmap the cached virtqueue elements on error, leading to memory leakage and     other unexpected results. Affected QEMU version: 6.2.0. (CVE-2022-26353)

  - An out-of-bounds read flaw was found in the QXL display device emulation in QEMU. The qxl_phys2virt()     function does not check the size of the structure pointed to by the guest physical address, potentially     reading past the end of the bar space into adjacent pages. A malicious guest user could use this flaw to     crash the QEMU process on the host causing a denial of service condition. (CVE-2022-4144)

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.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3635-1 advisory.

    Security issues fixed:

    - Fix heap use-after-free in virtio_net_receive_rcu (bsc#1189938, CVE-2021-3748)
    - Fix out-of-bounds write in UAS (USB Attached SCSI) device emulation (bsc#1189702, CVE-2021-3713)
    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3614-1 advisory.

    Security issues fixed:

    - Fix out-of-bounds write in UAS (USB Attached SCSI) device emulation (bsc#1189702, CVE-2021-3713)
    - Fix heap use-after-free in virtio_net_receive_rcu (bsc#1189938, CVE-2021-3748)
    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

    Non-security issues fixed:

    - Use max host physical address if -cpu max is used (bsc#1188299)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3613-1 advisory.

    Security issues fixed:

    - Fix heap use-after-free in virtio_net_receive_rcu (bsc#1189938, CVE-2021-3748)
    - Fix out-of-bounds write in UAS (USB Attached SCSI) device emulation (bsc#1189702, CVE-2021-3713)
    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3575-1 advisory.

    Security issues fixed:

    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:2858-1 advisory.

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in     versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function     while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-35503)

  - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0.
    This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of     service. The highest threat from this vulnerability is to system availability. (CVE-2020-35504)

  - A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw     allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.
    The highest threat from this vulnerability is to system availability. (CVE-2020-35505)

  - A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows     a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or     potential code execution with the privileges of the QEMU process. (CVE-2020-35506)

  - A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator     of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw     allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a     denial of service. The highest threat from this vulnerability is to system availability. (CVE-2021-20255)

  - A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a     single, large transfer request, to reduce the overhead and improve performance. The combined size of the     bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper     validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the     array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a     denial of service. (CVE-2021-3527)

  - A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs     when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A     malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata,     resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the     host. (CVE-2021-3682)

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

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2858-1 advisory.

    Security issues fixed:

    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

    Non-security issues fixed:

    - Use max host physical address if -cpu max is used (bsc#1188299)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SUSE15 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1202-1 advisory.

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in     versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function     while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-35503)

  - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0.
    This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of     service. The highest threat from this vulnerability is to system availability. (CVE-2020-35504)

  - A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw     allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.
    The highest threat from this vulnerability is to system availability. (CVE-2020-35505)

  - A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows     a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or     potential code execution with the privileges of the QEMU process. (CVE-2020-35506)

  - A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator     of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw     allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a     denial of service. The highest threat from this vulnerability is to system availability. (CVE-2021-20255)

  - A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a     single, large transfer request, to reduce the overhead and improve performance. The combined size of the     bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper     validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the     array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a     denial of service. (CVE-2021-3527)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the bootp_input() function and could occur while processing a udp packet that is smaller than     the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of     uninitialized heap memory from the host. The highest threat from this vulnerability is to data     confidentiality. This flaw affects libslirp versions prior to 4.6.0. (CVE-2021-3592)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the     size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0. (CVE-2021-3593)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the udp_input() function and could occur while processing a udp packet that is smaller than the     size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0. (CVE-2021-3594)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the     size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0. (CVE-2021-3595)

  - A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs     when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A     malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata,     resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the     host. (CVE-2021-3682)

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

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2813-1 advisory.

    Security issues fixed:

    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SUSE15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:2789-1 advisory.

  - A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in     versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function     while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-35503)

  - A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0.
    This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of     service. The highest threat from this vulnerability is to system availability. (CVE-2020-35504)

  - A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw     allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.
    The highest threat from this vulnerability is to system availability. (CVE-2020-35505)

  - A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in     versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows     a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or     potential code execution with the privileges of the QEMU process. (CVE-2020-35506)

  - A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator     of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw     allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a     denial of service. The highest threat from this vulnerability is to system availability. (CVE-2021-20255)

  - A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a     single, large transfer request, to reduce the overhead and improve performance. The combined size of the     bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper     validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the     array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a     denial of service. (CVE-2021-3527)

  - A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs     when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A     malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata,     resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the     host. (CVE-2021-3682)

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

The remote SUSE Linux SLED15 / SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:2789-1 advisory.

    Security issues fixed:

    - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682)
    - NULL pointer dereference in ESP (bsc#1180433, CVE-2020-35504) (bsc#1180434, CVE-2020-35505)     (bsc#1180435, CVE-2020-35506)
    - NULL pointer dereference issue in megasas-gen2 host bus adapter (bsc#1180432, CVE-2020-35503)
    - eepro100: stack overflow via infinite recursion (bsc#1182651, CVE-2021-20255)
    - usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

ID	Name	Product	Family	Severity
232173	Linux Distros Unpatched Vulnerability : CVE-2020-35503	Nessus	Misc.	medium
406792	Alpine: multiple qemu packages: security update to 6.1.0-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
406792	Alpine: multiple qemu packages: security update to 6.1.0-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
175217	EulerOS Virtualization 3.0.2.0 : qemu-kvm (EulerOS-SA-2023-1688)	Nessus	Huawei Local Security Checks	high
155004	SUSE SLES12: qemu / qemu-arm / qemu-block-curl / qemu-block-iscsi / etc (SUSE-SU-2021:3635-1)	Nessus	SuSE Local Security Checks	high
154927	SUSE SLES15: qemu / qemu-arm / qemu-audio-alsa / qemu-audio-oss / qemu-audio-pa / etc (SUSE-SU-2021:3614-1)	Nessus	SuSE Local Security Checks	high
154922	SUSE SLES15: qemu / qemu-arm / qemu-block-curl / qemu-block-iscsi / etc (SUSE-SU-2021:3613-1)	Nessus	SuSE Local Security Checks	high
154708	SUSE SLES12: qemu / qemu-block-curl / qemu-block-rbd / qemu-block-ssh / etc (SUSE-SU-2021:3575-1)	Nessus	SuSE Local Security Checks	high
152894	openSUSE 15 Security Update : qemu (openSUSE-SU-2021:2858-1)	Nessus	SuSE Local Security Checks	high
152887	SUSE SLED15: qemu / qemu-arm / qemu-audio-alsa / qemu-audio-pa / etc (SUSE-SU-2021:2858-1)	Nessus	SuSE Local Security Checks	high
152876	openSUSE 15 Security Update : qemu (openSUSE-SU-2021:1202-1)	Nessus	SuSE Local Security Checks	high
152761	SUSE SLES12: qemu / qemu-arm / qemu-audio-alsa / qemu-audio-oss / qemu-audio-pa / etc (SUSE-SU-2021:2813-1)	Nessus	SuSE Local Security Checks	high
152734	openSUSE 15 Security Update : qemu (openSUSE-SU-2021:2789-1)	Nessus	SuSE Local Security Checks	high
152708	SUSE SLED15: qemu / qemu-arm / qemu-audio-alsa / qemu-audio-pa / qemu-block-curl / etc (SUSE-SU-2021:2789-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2020-35503

medium

Tenable Plugins

medium

high

high

high

high

high

high

high

high

high

high

high

high

high