CVE-2021-29946

NameCVE-2021-29946
DescriptionPorts that were written as an integer overflow above the bounds of a 16-bit integer could have bypassed port blocking restrictions when used in the Alt-Svc header. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
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-2632-1, DLA-2633-1, DSA-4895-1, DSA-4897-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid90.0-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)78.12.0esr-1~deb9u1fixed
buster78.11.0esr-1~deb10u1fixed
buster (security)78.12.0esr-1~deb10u1fixed
bullseye, sid78.12.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:78.12.0-1~deb9u1fixed
buster1:78.6.0-1~deb10u1vulnerable
buster (security)1:78.12.0-1~deb10u1fixed
bullseye, sid1:78.12.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)88.0-1
firefox-esrsourcestretch78.10.0esr-1~deb9u1DLA-2633-1
firefox-esrsourcebuster78.10.0esr-1~deb10u1DSA-4895-1
firefox-esrsource(unstable)78.10.0esr-1
thunderbirdsourcestretch1:78.10.0-1~deb9u1DLA-2632-1
thunderbirdsourcebuster1:78.10.0-1~deb10u1DSA-4897-1
thunderbirdsource(unstable)1:78.10.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-29946
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/#CVE-2021-29946
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-29946

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