Mozilla developers and community 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.
Christian Holler, Andrew McCreight, Georg Fritzsche, Tyson Smith, and Carsten Book reported crash and memory safety problems that affect Firefox 41.
Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Christian Holler, Andrew McCreight, Georg Fritzsche, Tyson Smith, and Carsten Book as the original reporter.
This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.