Hi pdp! Great admirer of your work :) I just wanted to inform you that I have tested your claim, on a fully patched/updated Win XP SP2 system with an admin account logged in, and was warned sufficiently(asked whether I wanted to play asx files, then asked if I was sure by Media Player, then pop-up was blocked by IE), while the page you tried to produce was blocked via IE's pop-up blocker. You can see/confirm this by viewing these screenshots: http://preview.tinyurl.com/34xpcz (http://i189.photobucket.com/albums/z159/vtknightmare/noworkie1.png ) and http://preview.tinyurl.com/34jx5v (http://i189.photobucket.com/albums/z159/vtknightmare/noworkie2.png ) This was tested on a plain/manila/vanilla version of XP SP2. All I did was update/upgrade to latest available from M$ Update. Sincerely, Aras Memisyazici IT/Security/Dev. Specialist Outreach Information Services Virginia Tech -----Original Message----- From: pdp (architect) [mailto:pdp.gnucitizen@xxxxxxxxxxxxxx] Sent: Tuesday, September 18, 2007 11:58 AM To: bugtraq@xxxxxxxxxxxxxxxxx; full-disclosure@xxxxxxxxxxxxxxxxx Subject: security notice: Backdooring Windows Media Files http://www.gnucitizen.org/blog/backdooring-windows-media-files It is very easy to put some HTML inside files supported by Window Media Player. The interesting thing is that these HTML pages run in less restrictive IE environment. I found that a fully patched windows XP SP2 with IE6 or IE7 and Windows Media Player 9 (default) will open any page of your choice in IE even if your default browser is Firefox, Opera or anything else you have in place. It means that even if you are running Firefox and you think that you are secure, by simply opening a media file, you expose yourself to all IE vulnerabilities there might be. Plus, attackers can perform very very interesting phishing attacks. I prepared a simple POC which spawns a browser window in full screen mode... Think about how easy it is going to be to fake the windows logout - login sequence and phish unaware users' credentials http://www.gnucitizen.org/projects/backdooring-windows-media-files/poc02 .asx On the other hand Media Player 11 (Vista by default) is not exposed to these attacks. -- pdp (architect) | petko d. petkov http://www.gnucitizen.org
