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Re: Facebook URL Redirect Vulnerability
From: Chris Evans <scarybeasts () gmail com>
Date: Thu, 3 Mar 2011 11:04:06 -0800

On Wed, Mar 2, 2011 at 6:30 AM, Nathan Power <np () securitypentest com> wrote:

There are 3 different steps to perform an attack using a URL redirect:  1)
trick the user


You do not need an open redirect to trick the user. Try <a href="
http://www.evil.com";>
www.facebook.com/OMFGacatvomitingacanaryandpuppiesandshit</a>

Also, a lot of the open redirector debate hinges on assuming a user knows
how to parse an URL and validate a hostname. It's a false assumption.

Cheers
Chris


2) redirect 3) exploit .. We are using a Facebook URL to trick the user, we
are using the URL redirect as the catalyst to perform an exploit.

Here are some examples of the types of attacks you can perform with a URL
redirect, CSRF, phishing (fake fb login), and browser exploits (javascript
zombie,0days,etc).

How would you have written the impact section?

To be clear - I was trying to make a point when determining the impact,
once you click on a bad link, bad things will happen.



Nathan Power
www.securitypentest.com



On Tue, Mar 1, 2011 at 8:56 PM, Andrew Farmer <andfarm () gmail com> wrote:

On 2011-02-28, at 09:42, Nathan Power wrote:
3. Impact:

Potentially allow an attacker to compromise a victim’s Facebook account
and/or computer system.

Do you have an actual attack in mind which could accomplish either of
these goals, or is this wishful thinking? (Browser exploits don't really
count, as those would work just fine with or without the redirect.)

To be clear - open redirects are certainly a problem, but don't try to
call them any more than that.



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_______________________________________________
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Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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