If at first you don't succeed; call it version 1.0
Friday, 14 September 2007

Performing XAS (Cross Application Scripting) attacks automatically (read "no user interaction") is very easy, as I showed before in my "shutting down skype" proof-of-concept.

But, what if you are using a limited web environment, where you can't use iframes or scripts to automate your pwning? Several limited web environments (e.g. blogger.com blog system) does not allow using iframes or script, but they do allow embedding QuickTime movies.

Few days ago, pdp found that it is possible to use QuickTime .qtl files to execute code from remote, when the default browser is Firefox. This is a variant of the good old MOAB #3 and pdp's own MP3 backdooring exploit. It uses a simple "-chrome" command-line switch injection.

As this is a Firefox only exploit, I looked for ways to do the same in Internet Explorer. I found that it is also possible to perform all other noted XAS attacks using QuickTime.

So now, if you are in a limited web environment, you can just embed a .qtl file and conduct an automated XAS attack against the visitor of the web page.

The following is the QuickTime .qtl version of the "shutting down skype" PoC:

<?xml version="1.0">
<?quicktime type="application/x-quicktime-media-link"?>
<embed src="nothing.mp3" autoplay="true" qtnext="skype:&quot; /shutdown"/>

An online proof-of-concept in a limited web environment - blogger.com - can be found here.

Fortunately, MySpace were smart enough to finally remove all QuickTime movies from their pages. I hope others will follow them.


Friday, 14 September 2007 16:03:30 UTC | Comments [0] | Security#
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