CVE-2019-11763

NameCVE-2019-11763
DescriptionFailure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of interest from filters. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
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-1987-1, DLA-1997-1, DSA-4549-1, DSA-4571-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid78.0.2-1fixed
firefox-esr (PTS)stretch68.4.1esr-1~deb9u1fixed
stretch (security)68.10.0esr-1~deb9u1fixed
buster68.7.0esr-1~deb10u1fixed
buster (security)68.10.0esr-1~deb10u1fixed
bullseye, sid68.10.0esr-1fixed
thunderbird (PTS)stretch1:68.4.1-1~deb9u1fixed
stretch (security)1:68.10.0-1~deb9u1fixed
buster1:68.7.0-1~deb10u1fixed
buster (security)1:68.10.0-1~deb10u1fixed
bullseye, sid1:68.10.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)70.0-1
firefox-esrsource(unstable)68.2.0esr-1
firefox-esrsourcebuster68.2.0esr-1~deb10u1DSA-4549-1
firefox-esrsourcejessie68.2.0esr-1~deb8u1DLA-1987-1
firefox-esrsourcestretch68.2.0esr-1~deb9u2DSA-4549-1
thunderbirdsource(unstable)1:68.2.1-1
thunderbirdsourcebuster1:68.2.2-1~deb10u1DSA-4571-1
thunderbirdsourcejessie1:68.2.2-1~deb8u1DLA-1997-1
thunderbirdsourcestretch1:68.2.2-1~deb9u1DSA-4571-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2019-33/#CVE-2019-11763
https://www.mozilla.org/en-US/security/advisories/mfsa2019-34/#CVE-2019-11763
https://www.mozilla.org/en-US/security/advisories/mfsa2019-35/#CVE-2019-11763

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