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Mozilla Foundation Security Advisory 2006-12

Title: Secure-site spoof (requires security warning dialog)
Impact: Low
Date: April 13, 2006
Reporter: Tristor
Products: Firefox, Mozilla Suite

Fixed in: Firefox 1.5
  Firefox 1.0.8
  SeaMonkey 1.0
  Mozilla Suite 1.7.13

Description

Tristor reports that it was possible to spoof the browser's secure-site indicators (the lock icon, the site name in the URL field, the gold URL field background in Firefox) by first loading the target secure site in a pop-up window, then changing its location to a different site.

If the user has turned on the "Entering secure site" modal warning dialog then the window location can be changed while that dialog is displayed and the secure-browsing indicators from the original site will remain.

These dialogs are turned off by default in Firefox, and most Suite users click the checkbox to turn them off.

Workaround

Turn off the "Entering encrypted site" warning dialog if you have not already.

References