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Mozilla Foundation Security Advisory 2011-02

Title: Recursive eval call causes confirm dialogs to evaluate to true
Impact: Critical
Announced: March 1, 2011
Reporter: Zach Hoffman
Products: Firefox, SeaMonkey

Fixed in: Firefox 3.6.14
  Firefox 3.5.17
  SeaMonkey 2.0.12


Security researcher Zach Hoffman reported that a recursive call to eval() wrapped in a try/catch statement places the browser into a inconsistent state. Any dialog box opened in this state is displayed without text and with non-functioning buttons. Closing the window causes the dialog to evaluate to true. An attacker could use this issue to force a user into accepting any dialog, such as one granting elevated privileges to the page presenting the dialog.