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Mozilla Foundation Security Advisory 2009-01

Title: Crashes with evidence of memory corruption (rv:1.9.0.6)
Impact: Critical
Announced: February 3, 2009
Reporter: Mozilla developers
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 3.0.6
  Thunderbird 2.0.0.21
  SeaMonkey 1.1.15

Mozilla developers 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.

Thunderbird shares the browser engine with Firefox and could be vulnerable if JavaScript were to be enabled in mail. This is not the default setting and we strongly discourage users from running JavaScript in mail. Without further investigation we cannot rule out the possibility that for some of these an attacker might be able to prepare memory for exploitation through some means other than JavaScript such as large images.

Workaround

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

References

Jesse Ruderman, Georgi Guninski, and Martijn Wargers reported crashes in the layout engine.

Gary Kwong reported a crash in the JavaScript engine. Firefox 2 releases are not affected by this vulnerability.