Description
The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mozilla Thunderbird
unspecified to < 60.6affected
Mozilla Firefox ESR
unspecified to < 60.6affected
Mozilla Firefox
unspecified to < 66affected
References
- https://www.mozilla.org/security/advisories/mfsa2019-07/ ↗
- https://www.mozilla.org/security/advisories/mfsa2019-08/ ↗
- https://www.mozilla.org/security/advisories/mfsa2019-11/ ↗
- https://bugzilla.mozilla.org/show_bug.cgi?id=1532599 ↗
- https://access.redhat.com/errata/RHSA-2019:0966 ↗
- https://access.redhat.com/errata/RHSA-2019:1144 ↗
- http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html ↗