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Mozilla Foundation Security Advisory 2009-65

Title: Crashes with evidence of memory corruption (rv:1.9.1.6/ 1.9.0.16)
Impact: Critical
Announced: December 15, 2009
Reporter: Mozilla developers and community
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 3.5.6
  Firefox 3.0.16
  SeaMonkey 2.0.1
  Thunderbird 3.0.1

Description

Mozilla developers and community members identified and fixed several stability bugs in the browser engine used in Firefox and other Mozilla-based products. Some of these crashes 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.

Workaround

Disable JavaScript until a version containing these fixes can be installed.

References

Jesse Ruderman, Josh Soref, Martijn Wargers, Jose Angel, and Olli Pettay reported crashes in the browser engine which affected both Firefox 3 and Firefox 3.5.

Jeremy Lea and Jesse Ruderman reported crashes in the browser engine which only affected Firefox 3.5.

Jesse Ruderman also reported a crash in the browser engine which only affected Firefox 3.

David Mandelin, Gary Kwong, Jason Orendorff and Igor Bukanov reported crashes in the JavaScript engine which only affected Firefox 3.5.