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Mozilla Foundation Security Advisory 2006-70

Title: Privilege escalation using watch point
Impact: Critical
Announced: December 19, 2006
Reporter: shutdown
Products: Firefox, Thunderbird, SeaMonkey

Fixed in: Firefox 2.0.0.1
  Firefox 1.5.0.9
  Thunderbird 1.5.0.9
  SeaMonkey 1.0.7

Description

Shutdown demonstrated that it was possible to use a JavaScript watch() to gain elevated privilege. This could be used to compromise the user's computer and install malware.

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.

Workaround

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

References

Exploit details withheld during the active upgrade period.