Mozilla Foundation Security Advisory 2006-04

Memory corruption via QueryInterface on Location, Navigator objects

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


Calling the QueryInterface method of the built-in Location and Navigator objects causes memory corruption that might be exploitable to run arbitrary code.

This flaw appears to have been introduced during development of Firefox 1.5/SeaMonkey 1.0 -- Firefox 1.0 and the older Mozilla Suite 1.7 do not appear to be vulnerable.

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 (7 February 2006)
H D Moore of the Metasploit Project published a working exploit on milw0rm for the Linux and Mac OS X versions of Firefox 1.5. Severity upgraded to critical.

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.