A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://bugzilla.mozilla.org/show_bug.cgi?id=1371889 | patch vendor advisory issue tracking |
| https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html | third party advisory mailing list |
| https://www.mozilla.org/security/advisories/mfsa2017-22/ | vendor advisory |
| http://www.securitytracker.com/id/1039465 | third party advisory vdb entry |
| https://access.redhat.com/errata/RHSA-2017:2831 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:2885 | third party advisory vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-21/ | vendor advisory |
| http://www.securityfocus.com/bid/101055 | third party advisory vdb entry |
| https://www.debian.org/security/2017/dsa-4014 | third party advisory vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-23/ | vendor advisory |
| https://www.debian.org/security/2017/dsa-3987 | third party advisory vendor advisory |
| https://security.gentoo.org/glsa/201803-14 | third party advisory vendor advisory |