A use-after-free vulnerability can occur when manipulating floating "first-letter" style elements, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 58.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 |
|---|---|
| http://www.securitytracker.com/id/1040270 | vdb entry third party advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1417661 | issue tracking permissions required |
| https://usn.ubuntu.com/3544-1/ | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/102786 | vdb entry third party advisory |
| https://www.mozilla.org/security/advisories/mfsa2018-02/ | vendor advisory |