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.

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

Bob Clary, Christian Holler, Bobby Holley, and Andrew McCreight reported memory safety problems and crashes that affect Firefox ESR 31.7, Firefox ESR 38, and Firefox 38.

Bob Clary, Terrence Cole, Christian Holler, Andrew McCreight, Steve Fink, Mats Palmgren, Wes Kocher, and Andreas Pehrson reported memory safety problems and crashes that affect Firefox ESR 38 and Firefox 38.


External Reference:

http://www.mozilla.org/security/announce/2015/mfsa2015-59.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Bob Clary, Christian Holler, Bobby Holley, Andrew McCreight, Terrence Cole, Steve Fink, Mats Palmgren, Wes Kocher, and Andreas Pehrson as the original reporter.