Andreas Sanblad of Secunia Research demonstrated a method to spoof the download dialog for saving files by supplying a Content-Disposition header with a different extension than the extension visible in the link and download dialog. Users could be tricked into downloading a safe-looking file such as a JPEG image and have it actually be saved with an executable extension. Windows hides file extensions by default. If the user did not notice the incorrect icon they might at some later time double-click on the saved file and execute it instead of having it open in the expected media application. http://www.mozilla.org/security/announce/mfsa2005-22.html
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-176.html