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Re: 0day critical vulnerability/exploit targets Winamp users in the wild
From: K-OTiK Security <Special-Alerts () k-otik com>
Date: 28 Aug 2004 13:56:12 -0000

In-Reply-To: <20040826164943.17362.qmail () www securityfocus com>

Nullsoft has issued a fix for this critical vulnerability affecting Winamp 3.0, 5.0 and 5.0 Pro or newer.

Nullsoft said that Winamp 5.05 resolves this exploit in two ways:

- Winamp will now prompt all users with a confirmation window before installing any skins. 
- Winamp will now only extract files considered low risk before loading a Winamp Skin. 

ALL Winamp users MUST upgrade to Winamp 5.05 immediately. 

http://www.winamp.com/player/

Regards.
K-OTik.COM Security Survey Team
http://www.k-otik.com 


take a look at the code/exploit : 
http://www.k-otik.com/exploits/08252004.skinhead.php

Secunia advisory : http://secunia.com/advisories/12381/

Thor Larholm -> When a user visits a website that hosts the Skinhead exploit their browser is redirected to a 
compressed Winamp Skin file which has a WSZ file extension but which in reality is a ZIP file. The default 
installation of Winamp registers the WSZ file extension and includes an EditFlags value with the bitflag 00000100 
which instructs Windows and Internet Explorer to automatically open these files when encountered. Because of this 
EditFlags value the fake Winamp skin is automatically loaded into Winamp which in turn open the "skin.xml" file inside 
the WSZ file. This skin.xml file references several include files such as "includes.xml", "player.xml" and 
"player-normal.xml", the latter of which opens an HTML file in Winamp's builtin webbrowser.

The HTML file that is opened exploit the traditional codeBase command execution vulnerability in Internet Explorer to 
execute "calc.exe" at which time the user is infected.

Regards.
K-OTik.COM Security Survey Team
http://www.k-otik.com 



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