Mozilla Foundation Security Advisory 2011-54

Potentially exploitable crash in the YARR regular expression library

Announced

December 20, 2011

Reporter

Aki Helin

Impact

Critical

Products

Firefox, SeaMonkey, Thunderbird

Fixed in

• Firefox 9
• SeaMonkey 2.6
• Thunderbird 9

Description

Security researcher Aki Helin reported a crash in the YARR regular expression library that could be triggered by javascript in web content.

The YARR library was not used in older versions of the Mozilla browser engine. This vulnerability does not affect Firefox 3.6 or Thunderbird 3.1

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=691299
• https://bugs.webkit.org/show_bug.cgi?id=70648
• CVE-2011-3661