CVE-2021-38506

NameCVE-2021-38506
DescriptionThrough a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, 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)sid131.0-1fixed
firefox-esr (PTS)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)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)94.0-1
firefox-esrsourcestretch91.4.1esr-1~deb9u1DLA-2863-1
firefox-esrsourcebullseye91.4.1esr-1~deb11u1DSA-5026-1
firefox-esrsource(unstable)91.3.0esr-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)1:91.3.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-38506
https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-38506
https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-38506

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