A use-after-free vulnerability can occur when manipulating the DOM during the resize event of an image element. If these elements have been freed due to a lack of strong references, a potentially exploitable crash may occur when the freed elements are accessed. 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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://bugzilla.mozilla.org/show_bug.cgi?id=1378147 | issue tracking exploit 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 |
| 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.securityfocus.com/bid/100202 | vdb entry third party 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://www.debian.org/security/2017/dsa-3928 | third party advisory vendor advisory |