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Re: [Full-disclosure] Facebook URL Redirect Vulnerability
- To: "Nathan Power" <np@xxxxxxxxxxxxxxxxxxx>
- Subject: Re: [Full-disclosure] Facebook URL Redirect Vulnerability
- From: "Weir, Jason" <jason.weir@xxxxxxxx>
- Date: Wed, 2 Mar 2011 14:53:58 -0500
I appreciate that!
-J
-----Original Message-----
From: Nathan Power [mailto:np@xxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, March 02, 2011 10:46 AM
To: Weir, Jason
Cc: Full Disclosure
Subject: Re: [Full-disclosure] Facebook URL Redirect
Vulnerability
This rule can be subverted because of the content keyword.
Below is an example:
http://apps.facebook.com/truthsaboutu/track.php?a=a&r=http://www.securit
ypentest.com
Add two content keywords 'track.php?' and 'r='
Nathan Power
www.securitypentest.com
On Mon, Feb 28, 2011 at 3:35 PM, Weir, Jason
<jason.weir@xxxxxxxx> wrote:
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@xxxxxxxxxxxxxxxxx
[mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] 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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