CVE-2021-3468

NameCVE-2021-3468
DescriptionA flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3047-1, DLA-3466-1
Debian Bugs984938

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
avahi (PTS)buster0.7-4+deb10u1vulnerable
buster (security)0.7-4+deb10u3fixed
bullseye0.8-5+deb11u2fixed
bookworm0.8-10fixed
trixie, sid0.8-11fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
avahisourcestretch0.6.32-2+deb9u1DLA-3047-1
avahisourcebuster0.7-4+deb10u3DLA-3466-1
avahisourcebullseye0.8-5+deb11u2
avahisource(unstable)0.8-7984938

Notes

https://github.com/lathiat/avahi/pull/330
https://github.com/lathiat/avahi/commit/447affe29991ee99c6b9732fc5f2c1048a611d3b
https://bugzilla.redhat.com/show_bug.cgi?id=1939614#c3

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