mikx has discovered a weakness in Mozilla and Mozilla Firefox, which potentially can be exploited by malicious people to trick users into performing unintended actions.

The problem is that popup windows can overlay modal dialogs. This can e.g. be exploited by a malicious web site to hide the information text in a download or security dialog in order to trick a user into accepting it.

Exploitation is more or less convincing depending on the used Windows desktop theme.

The weakness has been confirmed on Mozilla Firefox 1.0 and Mozilla 1.7.5 for Windows.

Solution
Mozilla Firefox:
Further details available to Secunia VIM customers

Provided and/or discovered by
mikx

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://www.mikx.de/?p=7

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers