CVE-2021-3502

NameCVE-2021-3502
DescriptionA flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
Debian Bugs986018

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
avahi (PTS)stretch0.6.32-2fixed
buster0.7-4+deb10u1fixed
bullseye, sid0.8-5vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
avahisourcestretch(not affected)
avahisourcebuster(not affected)
avahisource(unstable)(unfixed)986018

Notes

[buster] - avahi <not-affected> (Vulnerable code introduced later)
[stretch] - avahi <not-affected> (Vulnerable code introduced later)
https://github.com/lathiat/avahi/issues/338
Introduced by: https://github.com/lathiat/avahi/commit/80c98fa16782e921f5b5d5c880f1d80f5c43bd49 (v0.8)

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