A use-after-free vulnerability during specific user interactions with the input method editor (IME) in some languages due to how events are handled. This results in a potentially exploitable crash but would require specific user interaction to trigger. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 |
|---|---|
| http://www.securityfocus.com/bid/99057 | vdb entry third party advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1359547 | issue tracking vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-15/ | vendor advisory |
| https://www.debian.org/security/2017/dsa-3918 | third party advisory vendor advisory |
| http://www.securitytracker.com/id/1038689 | vdb entry third party advisory |
| https://www.debian.org/security/2017/dsa-3881 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:1440 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:1561 | third party advisory vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-17/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-16/ | vendor advisory |