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
