CVE-2021-23978

NameCVE-2021-23978
DescriptionMozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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 Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2575-1, DLA-2578-1, DSA-4862-1, DSA-4866-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid105.0-1fixed
firefox-esr (PTS)buster91.12.0esr-1~deb10u1fixed
buster (security)91.13.0esr-1~deb10u1fixed
bullseye91.13.0esr-1~deb11u1fixed
bullseye (security)102.3.0esr-1~deb11u1fixed
bookworm102.2.0esr-1fixed
sid102.3.0esr-1fixed
thunderbird (PTS)buster1:91.12.0-1~deb10u1fixed
buster (security)1:91.13.0-1~deb10u1fixed
bullseye (security), bullseye1:91.13.0-1~deb11u1fixed
bookworm1:102.2.2-1fixed
sid1:102.3.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)86.0-1
firefox-esrsourcestretch78.8.0esr-1~deb9u1DLA-2575-1
firefox-esrsourcebuster78.8.0esr-1~deb10u1DSA-4862-1
firefox-esrsource(unstable)78.8.0esr-1
thunderbirdsourcestretch1:78.8.0-1~deb9u1DLA-2578-1
thunderbirdsourcebuster1:78.8.0-1~deb10u1DSA-4866-1
thunderbirdsource(unstable)1:78.8.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/#CVE-2021-23978
https://www.mozilla.org/en-US/security/advisories/mfsa2021-08/#CVE-2021-23978
https://www.mozilla.org/en-US/security/advisories/mfsa2021-09/#CVE-2021-23978

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