CVE-2020-12420

NameCVE-2020-12420
DescriptionWhen trying to connect to a STUN server, a race condition could have caused a use-after-free of a pointer, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-4713-1, DSA-4718-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid133.0-1fixed
firefox-esr (PTS)jessie, jessie (lts)68.9.0esr-1~deb8u2vulnerable
stretch (security), stretch (lts), stretch91.11.0esr-1~deb9u1fixed
buster (security), buster, buster (lts)115.12.0esr-1~deb10u1fixed
bullseye115.14.0esr-1~deb11u1fixed
bullseye (security)128.5.0esr-1~deb11u1fixed
bookworm128.3.1esr-1~deb12u1fixed
bookworm (security)128.5.0esr-1~deb12u1fixed
sid, trixie128.5.0esr-1fixed
thunderbird (PTS)jessie, jessie (lts)1:68.9.0-1~deb8u2vulnerable
stretch (security), stretch (lts), stretch1:91.10.0-1~deb9u1fixed
buster (security), buster, buster (lts)1:115.12.0-1~deb10u1fixed
bullseye1:115.12.0-1~deb11u1fixed
bullseye (security)1:128.5.0esr-1~deb11u1fixed
bookworm1:115.16.0esr-1~deb12u1fixed
bookworm (security)1:128.5.0esr-1~deb12u1fixed
sid, trixie1:128.5.0esr-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)78.0-1
firefox-esrsourcejessie(unfixed)end-of-life
firefox-esrsourcestretch68.10.0esr-1~deb9u1DSA-4713-1
firefox-esrsourcebuster68.10.0esr-1~deb10u1DSA-4713-1
firefox-esrsource(unstable)68.10.0esr-1
thunderbirdsourcejessie(unfixed)end-of-life
thunderbirdsourcestretch1:68.10.0-1~deb9u1DSA-4718-1
thunderbirdsourcebuster1:68.10.0-1~deb10u1DSA-4718-1
thunderbirdsource(unstable)1:68.10.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2020-24/#CVE-2020-12420
https://www.mozilla.org/en-US/security/advisories/mfsa2020-25/#CVE-2020-12420
https://www.mozilla.org/en-US/security/advisories/mfsa2020-26/#CVE-2020-12420

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