CVE-2021-29976

NameCVE-2021-29976
DescriptionMozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2709-1, DLA-2711-1, DSA-4939-1, DSA-4940-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid126.0-1fixed
firefox-esr (PTS)jessie, jessie (lts)68.9.0esr-1~deb8u2vulnerable
stretch (security), stretch (lts), stretch91.11.0esr-1~deb9u1fixed
buster91.12.0esr-1~deb10u1fixed
buster (security)115.11.0esr-1~deb10u1fixed
bullseye115.7.0esr-1~deb11u1fixed
bullseye (security)115.11.0esr-1~deb11u1fixed
bookworm115.7.0esr-1~deb12u1fixed
bookworm (security)115.11.0esr-1~deb12u1fixed
sid, trixie115.11.0esr-1fixed
thunderbird (PTS)jessie, jessie (lts)1:68.9.0-1~deb8u2vulnerable
stretch (security), stretch (lts), stretch1:91.10.0-1~deb9u1fixed
buster1:91.12.0-1~deb10u1fixed
buster (security)1:115.11.0-1~deb10u1fixed
bullseye1:115.7.0-1~deb11u1fixed
bullseye (security)1:115.11.0-1~deb11u1fixed
bookworm1:115.7.0-1~deb12u1fixed
bookworm (security)1:115.11.0-1~deb12u1fixed
trixie1:115.10.1-1fixed
sid1:115.11.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)90.0-1
firefox-esrsourcejessie(unfixed)end-of-life
firefox-esrsourcestretch78.12.0esr-1~deb9u1DLA-2709-1
firefox-esrsourcebuster78.12.0esr-1~deb10u1DSA-4939-1
firefox-esrsource(unstable)78.12.0esr-1
thunderbirdsourcejessie(unfixed)end-of-life
thunderbirdsourcestretch1:78.12.0-1~deb9u1DLA-2711-1
thunderbirdsourcebuster1:78.12.0-1~deb10u1DSA-4940-1
thunderbirdsource(unstable)1:78.12.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29976
https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/#CVE-2021-29976
https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29976

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