CVE-2021-29951

NameCVE-2021-29951
DescriptionThe Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which, in a domain network, grants normal remote users access to start or stop the service. This could be used to prevent the browser update service from operating (if an attacker spammed the 'Stop' command); but also exposed attack surface in the maintenance service. *Note: This issue only affected Windows operating systems older than Win 10 build 1709. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.10.1, Firefox < 87, and Firefox ESR < 78.10.1.
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-esr (PTS)stretch68.10.0esr-1~deb9u1fixed
stretch (security)78.14.0esr-1~deb9u1fixed
buster78.11.0esr-1~deb10u1fixed
buster (security)78.14.0esr-1~deb10u1fixed
bullseye78.12.0esr-1fixed
bullseye (security)78.14.0esr-1~deb11u1fixed
bookworm, sid78.14.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1fixed
stretch (security)1:78.14.0-1~deb9u1fixed
buster1:78.6.0-1~deb10u1fixed
buster (security)1:78.14.0-1~deb10u1fixed
bullseye1:78.12.0-1fixed
bullseye (security)1:78.14.0-1~deb11u1fixed
bookworm, sid1:78.14.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefox-esrsource(unstable)(not affected)
thunderbirdsource(unstable)(not affected)

Notes

- firefox-esr <not-affected> (Only affects Windows)
- thunderbird <not-affected> (Only affects Windows)
https://www.mozilla.org/en-US/security/advisories/mfsa2021-18/#CVE-2021-29951
https://www.mozilla.org/en-US/security/advisories/mfsa2021-19/#CVE-2021-29951

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