An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server resulting in a denial of service.

The remote CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the qemu-kvm-6.1.0-3.el9 build changelog.

  - use-after-free during packet reassembly [rhel-av-8]) (CVE-2019-15890)

  - A flaw was found in QEMU in the implementation of the Pointer Authentication (PAuth) support for ARM     introduced in version 4.0 and fixed in version 5.0.0. A general failure of the signature generation     process caused every PAuth-enforced pointer to be signed with the same signature. A local attacker could     obtain the signature of a protected pointer and abuse this flaw to bypass PAuth protection for all     programs running on QEMU. (CVE-2020-10702)

  - A potential DoS flaw was found in the virtio-fs shared file system daemon (virtiofsd) implementation of     the QEMU version >= v5.0. Virtio-fs is meant to share a host file system directory with a guest via     virtio-fs device. If the guest opens the maximum number of file descriptors under the shared directory, a     denial of service may occur. This flaw allows a guest user/process to cause this denial of service on the     host. (CVE-2020-10717)

  - An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator.
    This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known     as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible     information disclosure. This flaw affects versions of libslirp before 4.3.1. (CVE-2020-10756)

  - An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before     QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary     of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server     resulting in a denial of service. (CVE-2020-10761)

  - out-of-bounds r/w access issue while processing usb packets [rhel-av-8.3.0]) (CVE-2020-14364)

  - OOB heap access via an unexpected response of iSCSI Server [rhel-av-8.2.0]) (CVE-2020-1711)

  - A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows     crafted packets to cause a denial of service. (CVE-2020-1983)

  - A flaw was found in the memory management API of QEMU during the initialization of a memory region cache.
    This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO     operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial     of service. This flaw affects QEMU versions prior to 5.2.0. (CVE-2020-27821)

  - 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)

  - OOB buffer access while emulating tcp protocols in tcp_emu() [rhel-av-8.2.0]) (CVE-2020-7039)

  - potential OOB access due to unsafe snprintf() usages [rhel-av-8.2.0]) (CVE-2020-8608)

  - An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of     QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an     interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said     issue while updating controller state fields and their subsequent processing. A privileged guest user may     use this flaw to crash the QEMU process on the host resulting in DoS scenario. (CVE-2021-20221)

  - 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)

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

The remote host is affected by the vulnerability described in GLSA-202011-09 (QEMU: Multiple vulnerabilities)

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

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

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

  - An assertion failure issue was found in the Network     Block Device(NBD) Server in all QEMU versions before     QEMU 5.0.1. This flaw occurs when an nbd-client sends a     spec-compliant request that is near the boundary of     maximum permitted request length. A remote nbd-client     could use this flaw to crash the qemu-nbd server     resulting in a denial of service.(CVE-2020-10761)

  - address_space_map in exec.c in QEMU 4.2.0 can trigger a     NULL pointer dereference related to     BounceBuffer.(CVE-2020-13659)

  - In QEMU 5.0.0 and earlier, es1370_transfer_audio in     hw/audio/es1370.c does not properly validate the frame     count, which allows guest OS users to trigger an     out-of-bounds access during an es1370_write()     operation.(CVE-2020-13361)

  - In QEMU 5.0.0 and earlier, megasas_lookup_frame in     hw/scsi/megasas.c has an out-of-bounds read via a     crafted reply_queue_head field from a guest OS     user.(CVE-2020-13362)

  - sd_wp_addr in hw/sd/sd.c in QEMU 4.2.0 uses an     unvalidated address, which leads to an out-of-bounds     read during sdhci_write() operations. A guest OS user     can crash the QEMU process.(CVE-2020-13253)

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 Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4467-1 advisory.

    Ziming Zhang and VictorV discovered that the QEMU SLiRP networking implementation incorrectly handled     replying to certain ICMP echo requests. An attacker inside a guest could possibly use this issue to leak     host memory to obtain sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2020-10756)

    Eric Blake and Xueqiang Wei discovered that the QEMU NDB implementation incorrectly handled certain     requests. A remote attacker could possibly use this issue to cause QEMU to crash, resulting in a denial of     service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-10761)

    Ziming Zhang discovered that the QEMU SM501 graphics driver incorrectly handled certain operations. An     attacker inside a guest could use this issue to cause QEMU to crash, resulting in a denial of service, or     possibly execute arbitrary code. (CVE-2020-12829)

    It was discovered that the QEMU SD memory card implementation incorrectly handled certain memory     operations. An attacker inside a guest could possibly use this issue to cause QEMU to crash, resulting in     a denial of service. (CVE-2020-13253)

    Ren Ding and Hanqing Zhao discovered that the QEMU ES1370 audio driver incorrectly handled certain invalid     frame counts. An attacker inside a guest could possibly use this issue to cause QEMU to crash, resulting     in a denial of service. (CVE-2020-13361)

    Ren Ding and Hanqing Zhao discovered that the QEMU MegaRAID SAS SCSI driver incorrectly handled certain     memory operations. An attacker inside a guest could possibly use this issue to cause QEMU to crash,     resulting in a denial of service. (CVE-2020-13362)

    Alexander Bulekov discovered that QEMU MegaRAID SAS SCSI driver incorrectly handled certain memory space     operations. An attacker inside a guest could possibly use this issue to cause QEMU to crash, resulting in     a denial of service. (CVE-2020-13659)

    Ren Ding, Hanqing Zhao, Alexander Bulekov, and Anatoly Trosinenko discovered that the QEMU incorrectly     handled certain msi-x mmio operations. An attacker inside a guest could possibly use this issue to cause     QEMU to crash, resulting in a denial of service. (CVE-2020-13754)

    It was discovered that QEMU incorrectly handled certain memory copy operations when loading ROM contents.
    If a user were tricked into running an untrusted kernel image, a remote attacker could possibly use this     issue to run arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
    (CVE-2020-13765)

    Ren Ding, Hanqing Zhao, and Yi Ren discovered that the QEMU ATI video driver incorrectly handled certain     index values. An attacker inside a guest could possibly use this issue to cause QEMU to crash, resulting     in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-13800)

    Ziming Zhang discovered that the QEMU OSS audio driver incorrectly handled certain operations. An attacker     inside a guest could possibly use this issue to cause QEMU to crash, resulting in a denial of service.
    This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14415)

    Ziming Zhang discovered that the QEMU XGMAC Ethernet controller incorrectly handled packet transmission.
    An attacker inside a guest could use this issue to cause QEMU to crash, resulting in a denial of service,     or possibly execute arbitrary code. (CVE-2020-15863)

    Ziming Zhang discovered that the QEMU e1000e Ethernet controller incorrectly handled packet processing. An     attacker inside a guest could possibly use this issue to cause QEMU to crash, resulting in a denial of     service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-16092)

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

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

This update for qemu to version 4.2.1 fixes the following issues :

  - CVE-2020-10761: Fixed a denial of service in Network     Block Device (nbd) support infrastructure (bsc#1172710).

  - CVE-2020-13800: Fixed a denial of service possibility in     ati-vga emulation (bsc#1172495).

  - CVE-2020-13659: Fixed a NULL pointer dereference     possibility in MegaRAID SAS 8708EM2 emulation     (bsc#1172386).

  - CVE-2020-13362: Fixed an OOB access possibility in     MegaRAID SAS 8708EM2 emulation (bsc#1172383).

  - CVE-2020-13361: Fixed an OOB access possibility in     ES1370 audio device emulation (bsc#1172384).

This update was imported from the SUSE:SLE-15-SP2:Update update project.

This update for qemu to version 4.2.1 fixes the following issues :

CVE-2020-10761: Fixed a denial of service in Network Block Device (nbd) support infrastructure (bsc#1172710).

CVE-2020-13800: Fixed a denial of service possibility in ati-vga emulation (bsc#1172495).

CVE-2020-13659: Fixed a NULL pointer dereference possibility in MegaRAID SAS 8708EM2 emulation (bsc#1172386).

CVE-2020-13362: Fixed an OOB access possibility in MegaRAID SAS 8708EM2 emulation (bsc#1172383).

CVE-2020-13361: Fixed an OOB access possibility in ES1370 audio device emulation (bsc#1172384).

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.

The version of QEMU installed on the remote Windows host is prior to release 5.1.0-rc0. It is, therefore, affected by multiple vulnerabilities:
  A denial of service flaw occurs when an nbd-client sends a spec-compliant request that is near the   boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the   qemu-nbd server resulting in a denial of service. (CVE-2020-10761)

  An out-of-bounds error occurs within hw/pci/pci.c. A guest OS user could use this flaw   by providing an address near the end of the PCI configuration space. (CVE-2020-13791)

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

  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)

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
191255	CentOS 9 : qemu-kvm-6.1.0-3.el9	Nessus	CentOS Local Security Checks	high
142843	GLSA-202011-09 : QEMU: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
142187	EulerOS 2.0 SP8 : qemu (EulerOS-SA-2020-2320)	Nessus	Huawei Local Security Checks	low
139725	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : QEMU vulnerabilities (USN-4467-1)	Nessus	Ubuntu Local Security Checks	medium
139168	openSUSE Security Update : qemu (openSUSE-2020-1108)	Nessus	SuSE Local Security Checks	low
138992	SUSE SLED15 / SLES15 Security Update : qemu (SUSE-SU-2020:2015-1)	Nessus	SuSE Local Security Checks	low
138897	QEMU 4.2 < 5.1.0-rc0 Multiple Vulnerabilities	Nessus	Windows	medium

Detections

Analytics

CVE-2020-10761

medium

Tenable Plugins

high

medium

low

medium

low

low

medium