Microsoft MSN Messenger Message Spoofing Vulnerability

[Homer]

Microsoft's MSN Messenger is an instant messenging client for Windows based machines, based on the Passport system.

A vulnerability has been reported in some versions of MSN Messenger. Reportedly, it is possible to send messages through the server such that they appear to have originated from an arbitrary user.

 

[.::DefCon::.]

Kewl! And how can I do that?