Remote Yes

Type Arbitrary code execution

Description

A use-after-free issue has been found in firefox < 55.0 and thunderbird < 52.3, in WebSockets, when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash.

AVG-385 thunderbird 52.2.1-1 52.3.0-1 Critical Fixed

AVG-375 firefox 54.0.1-1 55.0-1 Critical Fixed

10 Aug 2017 ASA-201708-3 AVG-375 firefox Critical multiple issues

23 Aug 2017 ASA-201708-18 AVG-385 thunderbird Critical multiple issues

https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7800
https://bugzilla.mozilla.org/show_bug.cgi?id=1374047