Mozilla developers identified and fixed several memory safety bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these bugs showed evidence of memory corruption under certain circumstances, and we presume that with enough effort at least some of these could be exploited to run arbitrary code.
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.
Bill Gianopoulos, Benoit Jacob, Christoph Diehl, Christian Holler, Gary Kwong, Robert O'Callahan, and Scoobidiver reported memory safety problems and crashes that affect Firefox ESR 17 and Firefox 17.
Jesse Ruderman, Christian Holler, Julian Seward, and Scoobidiver reported memory safety problems and crashes that affect Firefox 17.
Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Bill Gianopoulos, Benoit Jacob, Christoph Diehl, Christian Holler, Gary Kwong, Robert O'Callahan, Scoobidiver, Jesse Ruderman and Julian Seward as the original reporter.
Not Vulnerable. This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5 and 6