CVE-2021-43538

NameCVE-2021-43538
DescriptionBy misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
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-2863-1, DLA-2874-1, DSA-5026-1, DSA-5034-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid107.0-1fixed
firefox-esr (PTS)buster91.12.0esr-1~deb10u1fixed
buster (security)102.5.0esr-1~deb10u1fixed
bullseye91.13.0esr-1~deb11u1fixed
bullseye (security)102.5.0esr-1~deb11u1fixed
bookworm, sid102.5.0esr-1fixed
thunderbird (PTS)buster1:91.12.0-1~deb10u1fixed
buster (security)1:102.5.0-1~deb10u1fixed
bullseye1:91.13.0-1~deb11u1fixed
bullseye (security)1:102.5.0-1~deb11u1fixed
bookworm, sid1:102.5.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)95.0-1
firefox-esrsourcestretch91.4.1esr-1~deb9u1DLA-2863-1
firefox-esrsourcebullseye91.4.1esr-1~deb11u1DSA-5026-1
firefox-esrsource(unstable)91.4.0esr-1
thunderbirdsourcestretch1:91.4.1-1~deb9u1DLA-2874-1
thunderbirdsourcebuster1:91.4.1-1~deb10u1DSA-5034-1
thunderbirdsourcebullseye1:91.4.1-1~deb11u1DSA-5034-1
thunderbirdsource(unstable)1:91.4.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/#CVE-2021-43538
https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/#CVE-2021-43538
https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-43538

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