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, 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
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid100.0-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)91.9.0esr-1~deb9u1fixed
buster78.14.0esr-1~deb10u1vulnerable
buster (security)91.9.0esr-1~deb10u1fixed
bullseye78.15.0esr-1~deb11u1vulnerable
bullseye (security)91.9.0esr-1~deb11u1fixed
bookworm, sid91.9.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:91.8.0-1~deb9u1fixed
buster1:78.14.0-1~deb10u1vulnerable
buster (security)1:91.8.0-1~deb10u1fixed
bullseye1:78.14.0-1~deb11u1vulnerable
bullseye (security)1:91.8.0-1~deb11u1fixed
bookworm1:91.8.1-1fixed
sid1:91.9.0-1fixed

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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