A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.

An update of the libvirt package has been released.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3778 advisory.

  - A NULL pointer dereference was found in the libvirt API responsible introduced in upstream version 3.10.0,     and fixed in libvirt 6.0.0, for fetching a storage pool based on its target path. In more detail, this     flaw affects storage pools created without a target path such as network-based pools like gluster and RBD.
    Unprivileged users with a read-only connection could abuse this flaw to crash the libvirt daemon,     resulting in a potential denial of service. (CVE-2020-10703)

  - An issue was discovered in qemuDomainGetStatsIOThread in qemu/qemu_driver.c in libvirt 4.10.0 though 6.x     before 6.1.0. A memory leak was found in the virDomainListGetStats libvirt API that is responsible for     retrieving domain statistics when managing QEMU guests. This flaw allows unprivileged users with a read-     only connection to cause a memory leak in the domstats command, resulting in a potential denial of     service. (CVE-2020-12430)

  - A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible     for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit     access control driver. Specifically, clients connecting to the read-write socket with limited ACL     permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or     potentially escalate their privileges on the system. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25637)

  - A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This     flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out     of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.
    (CVE-2021-3631)

  - An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in     the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly     released on ACL permission failure. Clients connecting to the read-write socket with limited ACL     permissions could use this flaw to acquire the lock and prevent other users from accessing storage     pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability     is to system availability. (CVE-2021-3667)

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

  - A flaw was found in the libvirt nwfilter driver. The virNWFilterObjListNumOfNWFilters method failed to     acquire the driver->nwfilters mutex before iterating over virNWFilterObj instances. There was no     protection to stop another thread from concurrently modifying the driver->nwfilters object. This flaw     allows a malicious, unprivileged user to exploit this issue via libvirt's API virConnectNumOfNWFilters to     crash the network filter management daemon (libvirtd/virtnwfilterd). (CVE-2022-0897)

  - An off-by-one error flaw was found in the udevListInterfacesByStatus() function in libvirt when the number     of interfaces exceeds the size of the `names` array. This issue can be reproduced by sending specially     crafted data to the libvirt daemon, allowing an unprivileged client to perform a denial of service attack     by causing the libvirt daemon to crash. (CVE-2024-1441)

  - A flaw was found in the RPC library APIs of libvirt. The RPC server deserialization code allocates memory     for arrays before the non-negative length check is performed by the C API entry points. Passing a negative     length to the g_new0 function results in a crash due to the negative length being treated as a huge     positive number. This flaw allows a local, unprivileged user to perform a denial of service attack by     causing the libvirt daemon to crash. (CVE-2024-2494)

  - A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces() function in libvirt. This     issue can occur when detaching a host interface while at the same time collecting the list of interfaces     via virConnectListAllInterfaces API. This flaw could be used to perform a denial of service attack by     causing the libvirt daemon to crash. (CVE-2024-2496)

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

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5399-1 advisory.

    It was discovered that libvirt incorrectly handled certain locking operations. A local attacker could     possibly use this issue to cause libvirt to stop accepting connections, resulting in a denial of service.
    This issue only affected Ubuntu 20.04 LTS. (CVE-2021-3667)

    It was discovered that libvirt incorrectly handled threads during shutdown. A local attacker could     possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only     affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2021-3975)

    It was discovered that libvirt incorrectly handled the libxl driver. An attacker inside a guest could     possibly use this issue to cause libvirtd to crash or stop responding, resulting in a denial of service.
    This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.10. (CVE-2021-4147)

    It was discovered that libvirt incorrectly handled the nwfilter driver. A local attacker could possibly     use this issue to cause libvirt to crash, resulting in a denial of service. (CVE-2022-0897)

    It was discovered that libvirt incorrectly handled the polkit access control driver. A local attacker     could possibly use this issue to cause libvirt to crash, resulting in a denial of service. This issue only     affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-25637)

    It was discovered that libvirt incorrectly generated SELinux labels. In environments using SELinux, this     issue could allow the sVirt confinement to be bypassed. This issue only affected Ubuntu 18.04 LTS and     Ubuntu 20.04 LTS. (CVE-2021-3631)

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.

The remote SUSE Linux SLES15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0045-2 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0128-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0045-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0042-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0041-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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 SLED12 / SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:0032-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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-2022:0031-1 advisory.

  - A use-after-free flaw was found in libvirt. The qemuMonitorUnregister() function in     qemuProcessHandleMonitorEOF is called using multiple threads without being adequately protected by a     monitor lock. This flaw could be triggered by the virConnectGetAllDomainStats API when the guest is     shutting down. An unprivileged client with a read-only connection could use this flaw to perform a denial     of service attack by causing the libvirt daemon to crash. (CVE-2021-3975)

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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 SLED15 / SLES15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2022:0021-1 advisory.

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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 SUSE15 host has packages installed that are affected by a vulnerability as referenced in the openSUSE-SU-2022:0021-1 advisory.

  - A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause     libvirtd on the host to deadlock or crash, resulting in a denial of service condition. (CVE-2021-4147)

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

ID	Name	Product	Family	Severity
204362	Photon OS 4.0: Libvirt PHSA-2023-4.0-0469	Nessus	PhotonOS Local Security Checks	medium
192736	Debian dla-3778 : libnss-libvirt - security update	Nessus	Debian Local Security Checks	medium
160444	Ubuntu 18.04 LTS / 20.04 LTS : libvirt vulnerabilities (USN-5399-1)	Nessus	Ubuntu Local Security Checks	medium
158146	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0045-2)	Nessus	SuSE Local Security Checks	medium
156881	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0128-1)	Nessus	SuSE Local Security Checks	medium
156634	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0045-1)	Nessus	SuSE Local Security Checks	medium
156615	SUSE SLES12 Security Update : libvirt (SUSE-SU-2022:0042-1)	Nessus	SuSE Local Security Checks	medium
156607	SUSE SLES12 Security Update : libvirt (SUSE-SU-2022:0041-1)	Nessus	SuSE Local Security Checks	medium
156479	SUSE SLED12 / SLES12 Security Update : libvirt (SUSE-SU-2022:0032-1)	Nessus	SuSE Local Security Checks	medium
156475	SUSE SLES15 Security Update : libvirt (SUSE-SU-2022:0031-1)	Nessus	SuSE Local Security Checks	medium
156468	SUSE SLED15 / SLES15 Security Update : libvirt (SUSE-SU-2022:0021-1)	Nessus	SuSE Local Security Checks	medium
156467	openSUSE 15 Security Update : libvirt (openSUSE-SU-2022:0021-1)	Nessus	SuSE Local Security Checks	medium

Detections

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CVE-2021-4147

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