From: Gadi Evron (gelinuxbox.org)
Date: Tue Jul 10 2007 - 10:53:21 CDT

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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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