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 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)sid100.0.2-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)91.9.1esr-1~deb9u1fixed
buster78.14.0esr-1~deb10u1vulnerable
buster (security)91.9.1esr-1~deb10u1fixed
bullseye78.15.0esr-1~deb11u1vulnerable
bullseye (security)91.9.1esr-1~deb11u1fixed
bookworm91.9.0esr-1fixed
sid91.9.1esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:91.9.0-1~deb9u1fixed
buster1:78.14.0-1~deb10u1vulnerable
buster (security)1:91.9.0-1~deb10u1fixed
bullseye1:78.14.0-1~deb11u1vulnerable
bullseye (security)1:91.9.0-1~deb11u1fixed
bookworm, sid1:91.9.0-1fixed

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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