CVE-2019-9793

NameCVE-2019-9793
DescriptionA mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. *Note: Spectre mitigations are currently enabled for all users by default settings.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
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-1722-1, DLA-1743-1, DSA-4411-1, DSA-4420-1
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)66.0-1
firefox-esrsourcejessie60.6.0esr-1~deb8u1DLA-1722-1
firefox-esrsourcestretch60.6.0esr-1~deb9u1DSA-4411-1
firefox-esrsource(unstable)60.6.0esr-1
thunderbirdsourcejessie1:60.6.1-1~deb8u1DLA-1743-1
thunderbirdsourcestretch1:60.6.1-1~deb9u1DSA-4420-1
thunderbirdsource(unstable)1:60.6.1-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2019-08/#CVE-2019-9793
https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9793
https://www.mozilla.org/en-US/security/advisories/mfsa2019-11/#CVE-2019-9793

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