Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2020-04/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-03/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1607443 | issue tracking |
| https://security.gentoo.org/glsa/202003-02 | third party advisory vendor advisory |
| https://usn.ubuntu.com/4335-1/ | third party advisory vendor advisory |
| http://packetstormsecurity.com/files/162568/Firefox-72-IonMonkey-JIT-Type-Confusion.html | exploit vdb entry third party advisory |