Mozilla Foundation Security Advisory 2015-79

Miscellaneous memory safety hazards (rv:40.0 / rv:38.2)

Announced

August 11, 2015

Reporter

Mozilla Developers

Impact

Critical

Products

Firefox, Firefox ESR, Firefox OS, SeaMonkey, Thunderbird

Fixed in

• Firefox 40
• Firefox ESR 38.2
• Firefox OS 2.5
• SeaMonkey 2.35
• Thunderbird 38.2

Description

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.

References

Gary Kwong, Christian Holler, and Byron Campen reported memory safety problems and crashes that affect Firefox ESR 38.1 and Firefox 39.

• Memory safety bugs fixed in Firefox ESR 38.2 and Firefox 40. (CVE-2015-4473)

Tyson Smith, Bobby Holley, Chris Coulson, Byron Campen, and Eric Rahm reported memory safety problems and crashes that affect Firefox 39.

• Memory safety bugs fixed in Firefox 40. (CVE-2015-4474)