An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.exploit-db.com/exploits/42071/ | exploit vdb entry third party advisory |
| https://access.redhat.com/errata/RHSA-2017:1106 | third party advisory vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1343552 | issue tracking exploit vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-12/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-11/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-10/ | vendor advisory |
| http://www.securityfocus.com/bid/97940 | vdb entry third party advisory |
| https://www.debian.org/security/2017/dsa-3831 | third party advisory vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2017-13/ | vendor advisory |
| http://www.securitytracker.com/id/1038320 | vdb entry third party advisory |
| https://access.redhat.com/errata/RHSA-2017:1104 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:1201 | third party advisory vendor advisory |