By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object during JavaScript execution and then referencing the object through a freed pointer, leading to a potential exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2022-13/ | exploit vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2022-14/ | exploit vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2022-15/ | exploit vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1751609 | issue tracking exploit vendor advisory |