Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9813 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1538006
- https://www.mozilla.org/security/advisories/mfsa2019-09/
- https://www.mozilla.org/security/advisories/mfsa2019-10/
- https://www.mozilla.org/security/advisories/mfsa2019-12/
- REDHAT:RHSA-2019:0966