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.

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

  - 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)

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 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 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)

The remote host is affected by the vulnerability described in GLSA-202208-27 (QEMU: Multiple Vulnerabilities)

  - 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)

  - hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This     occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or     process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or     potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.
    (CVE-2020-15863)

  - In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects     the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the     QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in     hw/net/net_tx_pkt.c. (CVE-2020-16092)

  - 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 flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system     daemon where a privileged guest user is able to create a device special file in the shared directory and     use it to r/w access host devices. (CVE-2020-35517)

  - 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)

  - 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 flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option     may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a     modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a     malicious user to elevate their privileges within the guest. (CVE-2021-20263)

  - The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to     the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This     flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of     service or potential code execution. QEMU up to (including) 5.2.0 is affected by this. (CVE-2021-3409)

  - A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions     up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get     bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the     host resulting in DoS scenario. (CVE-2021-3416)

  - 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)

  - 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)

  - An out-of-bounds write 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 occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET'     command from the guest. It could allow a privileged guest user to crash the QEMU process on the host,     resulting in a denial of service condition, or potential code execution with the privileges of the QEMU     process. (CVE-2021-3546)

  - A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. The issue occurs while     handling a PVRDMA_CMD_CREATE_MR command due to improper memory remapping (mremap). This flaw allows a     malicious guest to crash the QEMU process on the host. The highest threat from this vulnerability is to     system availability. (CVE-2021-3582)

  - An integer overflow was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions     prior to 6.1.0. The issue occurs while handling a PVRDMA_REG_DSRHIGH write from the guest due to     improper input validation. This flaw allows a privileged guest user to make QEMU allocate a large amount     of memory, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2021-3607)

  - A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to     6.1.0. The issue occurs while handling a PVRDMA_REG_DSRHIGH write from the guest and may result in a     crash of QEMU or cause undefined behavior due to the access of an uninitialized pointer. The highest     threat from this vulnerability is to system availability. (CVE-2021-3608)

  - A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious     guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service     condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU     versions prior to 7.0.0. (CVE-2021-3611)

  - 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)

  - 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 stack-buffer-overflow was found in QEMU in the NVME component. The flaw lies in nvme_changed_nslist()     where a malicious guest controlling certain input can read out of bounds memory. A malicious user could     use this flaw leading to disclosure of sensitive information. (CVE-2021-3947)

  - A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0.
    The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A     malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host     when writing data reaches the threshold of mirroring node. (CVE-2021-4145)

  - 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 QXL display device emulation in QEMU. A double fetch of guest controlled values     `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object     followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw     to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU     process. (CVE-2021-4207)

  - 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)

  - A flaw was found in the vhost-vsock device of QEMU. In case of error, an invalid element was not detached     from the virtqueue before freeing its memory, leading to memory leakage and other unexpected results.
    Affected QEMU versions <= 6.2.0. (CVE-2022-26354)

  -  Please review the referenced CVE identifiers for details.  (CVE-2021-3929)

  - QEMU: NULL pointer dereference in pci_write() in hw/acpi/pcihp.c (CVE-2021-4158)

  - QEMU: virtiofsd: potential privilege escalation via CVE-2018-13405 (CVE-2022-0358)

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 / 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
223558	Linux Distros Unpatched Vulnerability : CVE-2020-35506	Nessus	Misc.	medium
406791	Alpine: multiple qemu packages: security update to 6.0.0-r2	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
406791	Alpine: multiple qemu packages: security update to 6.0.0-r2	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
164115	GLSA-202208-27 : QEMU: Multiple Vulnerabilities	Nessus	Gentoo 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

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CVE-2020-35506

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