Mozilla Foundation Security Advisory 2011-48

Miscellaneous memory safety hazards (rv:8.0)

Announced

November 8, 2011

Impact

Critical

Products

Firefox, SeaMonkey, Thunderbird

Fixed in

• Firefox 8
• SeaMonkey 2.5
• Thunderbird 8

Description

Mozilla developers 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.

References

Jason Orendorff, Boris Zbarsky, Gregg Tavares, Mats Palmgren, Christian Holler, Jesse Ruderman, Simona Marcu, Bob Clary, and William McCloskey reported memory safety problems that affected Firefox 7.

• Memory safety bugs fixed in Firefox 8
• CVE-2011-3651

Security researcher Rh0 reported a potentially exploitable crash due to unchecked allocation failure.

• https://bugzilla.mozilla.org/show_bug.cgi?id=682727
• CVE-2011-3652

Security researcher Aki Helin reported a potentially exploitable crash with an SVG <mpath> linking to a non-SVG element.

• https://bugzilla.mozilla.org/show_bug.cgi?id=694953
• CVE-2011-3654