Secunia

A vulnerability has been discovered in Internet Explorer for Mac, which can be exploited by malicious web sites to spoof dialog boxes.

Inactive windows can launch dialog boxes so they appear to be displayed by a web site in another window. This can be exploited by a malicious web site to show a dialog box, which seems to originate from a trusted web site.

Successful exploitation would normally require that a user is tricked into opening a link from a malicious web site to a trusted web site in a new window.

A test is available here:
http://secunia.com/multiple_browsers_dialog_box_spoofing_test/

The vulnerability has been confirmed in Internet Explorer 5.2 for Mac. Other versions may also be affected.

Solution
Don't visit trusted web sites while visiting untrusted web sites or disable JavaScript.

Provided and/or discovered by
Reported in Internet Explorer for Mac by:
Dennis Catt

Vulnerability originally discovered by:
Jakob Balle, Secunia Research.

Original Advisory
http://secunia.com/secunia_research/2004-10/

Deep Links
Links available in Customer Area