CVE-2021-23960

NameCVE-2021-23960
DescriptionPerforming garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
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)
ReferencesDLA-2539-1, DLA-2541-1, DSA-4840-1, DSA-4842-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid90.0-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)78.12.0esr-1~deb9u1fixed
buster78.11.0esr-1~deb10u1fixed
buster (security)78.12.0esr-1~deb10u1fixed
bullseye, sid78.12.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:78.12.0-1~deb9u1fixed
buster1:78.6.0-1~deb10u1vulnerable
buster (security)1:78.12.0-1~deb10u1fixed
bullseye, sid1:78.12.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)85.0-1
firefox-esrsourcestretch78.7.0esr-1~deb9u1DLA-2539-1
firefox-esrsourcebuster78.7.0esr-1~deb10u1DSA-4840-1
firefox-esrsource(unstable)78.7.0esr-1
thunderbirdsourcestretch1:78.7.0-1~deb9u1DLA-2541-1
thunderbirdsourcebuster1:78.7.0-1~deb10u1DSA-4842-1
thunderbirdsource(unstable)1:78.7.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/#CVE-2021-23960
https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23960
https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23960

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