full-disclosure - Re: Facebook URL Redirect Vulnerability

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Message-ID: <F236CDCE34685A458D315422458642E2029D6BAE@pine.nhrs.org>
Date: Mon, 28 Feb 2011 15:35:44 -0500
From: "Weir, Jason" <jason.weir@...s.org>
To: "Nathan Power" <np@...uritypentest.com>,
	"Full Disclosure" <full-disclosure@...ts.grok.org.uk>
Subject: Re: Facebook URL Redirect Vulnerability

Here's a snort rule that will detect this 
 
alert tcp $HOME_NET any ->
[69.63.176.0/20,69.63.176.0/20,204.15.20.0/22] $HTTP_PORTS
(msg:"Facebook URL Redirect Vulnerability"; flow:established,to_server;
content:"GET"; nocase; http_method; content:"track.php?r="; nocase;
http_uri;
reference:lists.grok.org.uk/pipermail/full-disclosure/2011-February/0795
77.html; sid:xxxxxxx; rev:1;)
 
-J

	-----Original Message-----
	From: full-disclosure-bounces@...ts.grok.org.uk
[mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Nathan
Power
	Sent: Monday, February 28, 2011 12:43 PM
	To: Full Disclosure
	Subject: [Full-disclosure] Facebook URL Redirect Vulnerability
	
	
	
------------------------------------------------------------------
	1. Summary:
	
	Once the victim clicks on a specially crafted Facebook URL they
can be redirected to a malicious website.
	
------------------------------------------------------------------
	2. Description:
	
	Facebook applications use of 'track.php?r=' doesn't sanitize the
redirection input properly.  This allows an attacker to input any URL
that a victim will get redirected too.  It is not required for the
victim to be login to Facebook for this attack to work.
	
	The following is an example of a vulnerable URL:
	
http://apps.facebook.com/truthsaboutu/track.php?r=http://www.securitypen
test.com
	
	The following Google search query can be used to find vulnerable
URLs:
	site:facebook.com inurl:"track.php?" inurl:"r="
	
------------------------------------------------------------------
	3. Impact:
	
	Potentially allow an attacker to compromise a victim's Facebook
account and/or computer system.
	
------------------------------------------------------------------
	4. Affected Products:
	
	www.facebook.com
	
------------------------------------------------------------------
	5. Solution:  None
	
------------------------------------------------------------------
	6. Time Table:
	
	2/27/2011 Reported Vulnerability to the Vendor
	
------------------------------------------------------------------
	7. Credits:
	
	Discovered by Nathan Power
	www.securitypentest.com
	
------------------------------------------------------------------
	

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