CVE-2021-23984

NameCVE-2021-23984
DescriptionA malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.
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-2607-1, DLA-2609-1, DSA-4874-1, DSA-4876-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid107.0.1-1fixed
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, sid1:102.5.1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)87.0-1
firefox-esrsourcestretch78.9.0esr-1~deb9u1DLA-2607-1
firefox-esrsourcebuster78.9.0esr-1~deb10u1DSA-4874-1
firefox-esrsource(unstable)78.9.0esr-1
thunderbirdsourcestretch1:78.9.0-1~deb9u1DLA-2609-1
thunderbirdsourcebuster1:78.9.0-1~deb10u1DSA-4876-1
thunderbirdsource(unstable)1:78.9.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23984
https://www.mozilla.org/en-US/security/advisories/mfsa2021-11/#CVE-2021-23984
https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/#CVE-2021-23984

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