A use-after-free can occur when events are fired for a FontFace object after the object has been already been destroyed while working with fonts. This results in a potentially exploitable crash. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Debian_linux | Debian | 9.0 (including) | 9.0 (including) |
| Red Hat Enterprise Linux 5 | RedHat | firefox-0:45.8.0-2.el5_11 | * |
| Red Hat Enterprise Linux 5 | RedHat | thunderbird-0:45.8.0-1.el5_11 | * |
| Red Hat Enterprise Linux 6 | RedHat | firefox-0:45.8.0-2.el6_8 | * |
| Red Hat Enterprise Linux 6 | RedHat | thunderbird-0:45.8.0-1.el6_8 | * |
| Red Hat Enterprise Linux 7 | RedHat | firefox-0:52.0-4.el7_3 | * |
| Red Hat Enterprise Linux 7 | RedHat | thunderbird-0:45.8.0-1.el7_3 | * |
| Firefox | Ubuntu | precise | * |
| Firefox | Ubuntu | trusty | * |
| Firefox | Ubuntu | upstream | * |
| Firefox | Ubuntu | xenial | * |
| Firefox | Ubuntu | yakkety | * |
| Firefox | Ubuntu | zesty | * |
| Thunderbird | Ubuntu | devel | * |
| Thunderbird | Ubuntu | precise | * |
| Thunderbird | Ubuntu | trusty | * |
| Thunderbird | Ubuntu | upstream | * |
| Thunderbird | Ubuntu | xenial | * |
| Thunderbird | Ubuntu | yakkety | * |
| Thunderbird | Ubuntu | zesty | * |