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Re: Internet Explorer 0day exploit



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