Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2024.1962
libvirt security update
2 April 2024
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AusCERT Security Bulletin Summary
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Product: libvirt
Publisher: Debian
Operating System: Debian GNU/Linux
Resolution: Patch/Upgrade
CVE Names: CVE-2020-12430 CVE-2020-10703 CVE-2021-3667
CVE-2021-3631 CVE-2021-4147 CVE-2021-3975
CVE-2020-25637 CVE-2024-1441 CVE-2024-2496
CVE-2022-0897 CVE-2024-2494
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html
Comment: CVSS (Max): 6.7 CVE-2020-25637 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: [NIST], Red Hat
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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Debian LTS Advisory DLA-3778-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Guilhem Moulin
April 01, 2024 https://wiki.debian.org/LTS
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Package : libvirt
Version : 5.0.0-4+deb10u2
CVE ID : CVE-2020-10703 CVE-2020-12430 CVE-2020-25637 CVE-2021-3631
CVE-2021-3667 CVE-2021-3975 CVE-2021-4147 CVE-2022-0897
CVE-2024-1441 CVE-2024-2494 CVE-2024-2496
Debian Bug : 959447 971555 990709 991594 1002535 1009075 1066058 1067461
Multiple vulnerabilities were found in libvirt, a C toolkit to interact
with the virtualization capabilities of Linux, which could lead to
denial of service or information disclosure.
CVE-2020-10703
A NULL pointer dereference was found in the libvirt API that is responsible 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-2020-12430
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-2020-25637
A double free memory issue was found in the libvirt API that is 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-2021-3631
An issue was found in the generation of 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.
CVE-2021-3667
An improper locking issue was found in the virStoragePoolLookupByTargetPath API. 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.
CVE-2021-3975
A use-after-free issue was found in libvirt in qemuProcessHandleMonitorEOF(), where
the qemuMonitorUnregister() function 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-2021-4147
Jim Fehlig discovered that a malicious guest using the libxl driver could cause
libvirtd on the host to deadlock or crash when continuously rebooting itself.
CVE-2022-0897
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-2024-1441
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-2024-2494
The ALT Linux Team discovered that 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 therefore 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-2024-2496
A NULL pointer dereference flaw was found in the udevConnectListAllInterfaces()
function. 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.
For Debian 10 buster, these problems have been fixed in version
5.0.0-4+deb10u2.
We recommend that you upgrade your libvirt packages.
For the detailed security status of libvirt please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libvirt
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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