Denial of service in libvirt

1) Improper locking

EUVDB-ID: #VU62739

Risk: Medium

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-0897

CWE-ID: CWE-667 - Improper Locking

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service attack (DoS).

The vulnerability exists due to double-locking error within the nwfilterConnectNumOfNWFilters() function in nwfilter/nwfilter_driver.c in libvirt. An local user can abuse the libvirt API virConnectNumOfNWFilters to crash the network filter management daemon (libvirtd/virtnwfilterd).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

libvirt: 3.3.0 - 8.1.0

CPE2.3

• cpe:2.3:a:libvirt_org:libvirt:3.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvirt_org:libvirt:3.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:libvirt_org:libvirt:3.5.0:*:*:*:*:*:*:*

External links

https://gitlab.com/libvirt/libvirt/-/commit/a4947e8f63c3e6b7b067b444f3d6cf674c0d7f36

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.