CVE-2019-9815

NameCVE-2019-9815
DescriptionIf hyperthreading is not disabled, a timing attack vulnerability exists, similar to previous Spectre attacks. Apple has shipped macOS 10.14.5 with an option to disable hyperthreading in applications running untrusted code in a thread through a new sysctl. Firefox now makes use of it on the main thread and any worker threads. *Note: users need to update to macOS 10.14.5 in order to take advantage of this change.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
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 (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)(not affected)
firefox-esrsource(unstable)(not affected)
thunderbirdsource(unstable)(not affected)

Notes

- firefox <not-affected> (MacOS-specific)
- firefox-esr <not-affected> (MacOS-specific)
- thunderbird <not-affected> (MacOS-specific)
https://www.mozilla.org/en-US/security/advisories/mfsa2019-13/#CVE-2019-9815
https://www.mozilla.org/en-US/security/advisories/mfsa2019-14/#CVE-2019-9815
https://www.mozilla.org/en-US/security/advisories/mfsa2019-15/#CVE-2019-9815

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