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Re: Internet Explorer 0day exploit
From: Gadi Evron <ge () linuxbox org>
Date: Tue, 10 Jul 2007 10:53:21 -0500 (CDT)

On Tue, 10 Jul 2007, Thor Larholm wrote:
There is a URL protocol handler command injection vulnerability in Internet

Thor, thank you for sharing. Nice work.

To paraphrase Guninski, this is still not a 0day. It is a vulnerability 
being disclosed.


Explorer for Windows that allows you to execute shell commands with arbitrary 
arguments. This vulnerability can be triggered without user interaction 
simply by visiting a webpage.

When Internet Explorer encounters a reference to content inside a registered 
URL protocol handler scheme it calls ShellExecute with the EXE image path and 
passes the entire request URI without any input validation. For the sake of 
demonstration I have constructed an exploit that bounces through Firefox via 
the FirefoxURL protocol handler. The full advisory and a working Proof of 
Concept exploit can be found at

http://larholm.com/2007/07/10/internet-explorer-0day-exploit/

Cheers
Thor Larholm


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