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Windows Media Player Local File Detection

Windows Media Player Local File Detection
Posted Oct 30, 2009
Authored by Renard Volant | Site lrv.ch.vu

Windows Media Player version 11 suffers from a local file detection vulnerability.

tags | advisory, local
systems | windows
MD5 | 98d84d1e1313d92d599b98256f2cb656

Windows Media Player Local File Detection

Change Mirror Download
*** 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

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