Jerry Baker reported a crashing issue found through Thunderbird when downloading messages over a Secure Sockets Layer (SSL) connection. This was caused by a bug in the networking code assuming that secure connections were entirely handled on the socket transport thread when they can occur on a variety of threads. The resulting crash was potentially exploitable. While the initial issue was found through Thunderbird, the affected networking library is common to Mozilla code. External Reference: http://www.mozilla.org/security/announce/2013/mfsa2013-07.html Acknowledgements: Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Jerry Baker as the original reporter. Statement: Not Vulnerable. This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5 and 6