CVE-2020-6798

NameCVE-2020-6798
DescriptionIf a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.
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-2102-1, DLA-2104-1, DSA-4620-1, DSA-4625-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid79.0-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1fixed
stretch (security)68.11.0esr-1~deb9u1fixed
buster68.10.0esr-1~deb10u1fixed
buster (security)68.11.0esr-1~deb10u1fixed
bullseye, sid68.11.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1fixed
stretch (security)1:68.11.0-1~deb9u1fixed
buster1:68.10.0-1~deb10u1fixed
buster (security)1:68.11.0-1~deb10u1fixed
bullseye, sid1:68.11.0-3fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)73.0-1
firefox-esrsourcejessie68.5.0esr-1~deb8u1DLA-2102-1
firefox-esrsourcestretch68.5.0esr-1~deb9u1DSA-4620-1
firefox-esrsourcebuster68.5.0esr-1~deb10u1DSA-4620-1
firefox-esrsource(unstable)68.5.0esr-1
thunderbirdsourcejessie1:68.5.0-1~deb8u1DLA-2104-1
thunderbirdsourcestretch1:68.5.0-1~deb9u1DSA-4625-1
thunderbirdsourcebuster1:68.5.0-1~deb10u1DSA-4625-1
thunderbirdsource(unstable)1:68.5.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2020-05/#CVE-2020-6798
https://www.mozilla.org/en-US/security/advisories/mfsa2020-06/#CVE-2020-6798
https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/#CVE-2020-6798

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