Security researcher Mariusz Mlynski reported that it is possible to change the prototype of an object and bypass Chrome Object Wrappers (COW) to gain access to chrome privileged functions. This could allow 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/mfsa2013-14.html


Acknowledgements:

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