CVE-2021-38505

NameCVE-2021-38505
DescriptionMicrosoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. 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)

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~deb9u1fixed
stretch (security)91.9.1esr-1~deb9u1fixed
buster78.14.0esr-1~deb10u1fixed
buster (security)91.9.1esr-1~deb10u1fixed
bullseye78.15.0esr-1~deb11u1fixed
bullseye (security)91.9.1esr-1~deb11u1fixed
bookworm91.9.0esr-1fixed
sid91.9.1esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1fixed
stretch (security)1:91.9.0-1~deb9u1fixed
buster1:78.14.0-1~deb10u1fixed
buster (security)1:91.9.0-1~deb10u1fixed
bullseye1:78.14.0-1~deb11u1fixed
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)(not affected)
firefox-esrsource(unstable)(not affected)
thunderbirdsource(unstable)(not affected)

Notes

- firefox <not-affected> (Only affects Windows)
- firefox-esr <not-affected> (Only affects Windows)
- thunderbird <not-affected> (Only affects Windows)
https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-38505
https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-38505
https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-38505

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