CVE-2020-12387

NameCVE-2020-12387
DescriptionA race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2205-1, DLA-2206-1, DSA-4678-1, DSA-4683-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid131.0-1fixed
firefox-esr (PTS)jessie, jessie (lts)68.9.0esr-1~deb8u2fixed
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)115.15.0esr-1~deb11u1fixed
bookworm115.14.0esr-1~deb12u1fixed
bookworm (security)115.15.0esr-1~deb12u1fixed
trixie115.15.0esr-1fixed
sid128.3.0esr-1fixed
thunderbird (PTS)jessie, jessie (lts)1:68.9.0-1~deb8u2fixed
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)1:115.15.0-1~deb11u1fixed
bookworm1:115.12.0-1~deb12u1fixed
bookworm (security)1:115.15.0-1~deb12u1fixed
trixie1:128.2.0esr-1fixed
sid1:128.2.3esr-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)76.0-1
firefox-esrsourcewheezy(unfixed)end-of-life
firefox-esrsourcejessie68.8.0esr-1~deb8u1DLA-2205-1
firefox-esrsourcestretch68.8.0esr-1~deb9u1DSA-4678-1
firefox-esrsourcebuster68.8.0esr-1~deb10u1DSA-4678-1
firefox-esrsource(unstable)68.8.0esr-1
thunderbirdsourcewheezy(unfixed)end-of-life
thunderbirdsourcejessie1:68.8.0-1~deb8u1DLA-2206-1
thunderbirdsourcestretch1:68.8.0-1~deb9u1DSA-4683-1
thunderbirdsourcebuster1:68.8.0-1~deb10u1DSA-4683-1
thunderbirdsource(unstable)1:68.8.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2020-16/#CVE-2020-12387
https://www.mozilla.org/en-US/security/advisories/mfsa2020-17/#CVE-2020-12387
https://www.mozilla.org/en-US/security/advisories/mfsa2020-18/#CVE-2020-12387

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