Windows Media Player Plugin: Local File Detection Vulnerability

                                                *** Windows Media Player Plugin: Local File Detection Vulnerability ***

A design flaw in Windows Media Player 11 allows a remote attacker to determine the \
presence of local files (programs, documents, etc.). I sent an e-mail to Microsoft \
(nearly a year ago) but they never responded…

Windows Media Player permits to open locally stored media-files. Opening \
non-supported files usually provokes an error message. By a simple HTTP-redirect, the \
error message can be circumvented. Local files can be opened. The \
file-opening-procedure can be controlled with the “Player.OpenStateChange Event”. If \
a file exists, event 8 (”MediaChanging”) is fired. This way, via JavaScript, a \
malicious web site could determine the presence of local (and remote) files.

Additional infos (in German): www.lrv.ch.vu

I’ve also set up a demo page at: http://lrv.bplaced.net/wmp/wmp.php