Mozilla developer Olli Pettay discovered that the AutoWrapperChanger class fails to keep some javascript objects alive during garbage collection. This can lead to an exploitable crash allowing for arbitrary code execution.

In general these flaws cannot be exploited through email in the Thunderbird and SeaMonkey products because scripting is disabled, but are potentially a risk in browser or browser-like contexts in those products. 


External Reference:

http://www.mozilla.org/security/announce/2013/mfsa2013-08.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Olli Pettay 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