A use-after-free vulnerability can occur while re-computing layout for a "marquee" element during window resizing where the updated style object is freed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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/mfsa2017-19/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-20/ | vendor advisory |
| https://www.debian.org/security/2017/dsa-3968 | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/100197 | vdb entry third party advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-18/ | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2456 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2534 | third party advisory vendor advisory |
| http://www.securitytracker.com/id/1039124 | vdb entry third party advisory |
| https://security.gentoo.org/glsa/201803-14 | third party advisory vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1371259 | issue tracking patch vendor advisory exploit |
| https://www.debian.org/security/2017/dsa-3928 | third party advisory vendor advisory |