When adding a range to an object in the DOM, it is possible to use addRange to add the range to an incorrect root object. This triggers a use-after-free, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 52 and Thunderbird < 52.
Weakness
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Thunderbird | Mozilla | * | 52.0 (excluding) |
| Firefox | Ubuntu | precise | * |
| Firefox | Ubuntu | trusty | * |
| Firefox | Ubuntu | upstream | * |
| Firefox | Ubuntu | xenial | * |
| Firefox | Ubuntu | yakkety | * |
| Firefox | Ubuntu | zesty | * |
Potential Mitigations
References
- http://www.securityfocus.com/bid/96691
- http://www.securitytracker.com/id/1037966
- https://bugzilla.mozilla.org/show_bug.cgi?id=1340186
- https://www.mozilla.org/security/advisories/mfsa2017-05/
- https://www.mozilla.org/security/advisories/mfsa2017-09/
- http://www.securityfocus.com/bid/96691
- http://www.securitytracker.com/id/1037966
- https://bugzilla.mozilla.org/show_bug.cgi?id=1340186
- https://www.mozilla.org/security/advisories/mfsa2017-05/
- https://www.mozilla.org/security/advisories/mfsa2017-09/