CVE-2021-29987

NameCVE-2021-29987
DescriptionAfter requesting multiple permissions, and closing the first permission panel, subsequent permission panels will be displayed in a different position but still record a click in the default location, making it possible to trick a user into accepting a permission they did not want to. *This bug only affects Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and Thunderbird < 91.
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)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid93.0-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1fixed
stretch (security)1:78.14.0-1~deb9u1fixed
buster, buster (security)1:78.14.0-1~deb10u1fixed
bullseye (security), bullseye1:78.14.0-1~deb11u1fixed
bookworm, sid1:78.14.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)91.0-1
thunderbirdsource(unstable)(not affected)

Notes

- thunderbird <not-affected> (Thunderbird 78.x not affected, only TB91)
https://www.mozilla.org/en-US/security/advisories/mfsa2021-33/#CVE-2021-29987
https://www.mozilla.org/en-US/security/advisories/mfsa2021-36/#CVE-2021-29987

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