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Mozilla Foundation Security Advisory 2006-06

Integer overflows in E4X, SVG, and Canvas

February 1, 2006
Georgi Guninski
Firefox, SeaMonkey, Thunderbird
Fixed in
  • Firefox
  • SeaMonkey 1
  • Thunderbird


Georgi Guninski reports integer overflows in the new E4X, SVG, and Canvas features. These lead to memory corruption that is potentially exploitable to run arbitrary code.

These flaws were introduced during Firefox 1.5 and SeaMonkey 1.0 development and do not affect Firefox 1.0 or the Mozilla Suite 1.7

Thunderbird 1.5 could be vulnerable if JavaScript is enabled in mail. This is not the default setting and we strongly discourage users from turning on JavaScript in mail. Thunderbird is not vulnerable in its default configuration.

Update (13 April 2006)
This flaw has been fixed in Thunderbird


Upgrade to the fixed versions. Do not enable JavaScript in Thunderbird or SeaMonkey mail.