When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15669 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1656957
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1656957
- https://www.mozilla.org/security/advisories/mfsa2020-37/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-37/
- https://www.mozilla.org/security/advisories/mfsa2020-40/