bugtraq - Re: facebook 'routing flaw'?

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Date: Mon, 18 Jan 2010 17:44:29 -0800
From: Manny Ponce <reficul@...tymouth.org>
To: bugtraq@...urityfocus.com
Subject: Re: facebook 'routing flaw'?

I logged out of the mobile interface on my AT&T cell phone. "Just in case"

What is also frightening / interesting is that facebook seems to link 
the two sessions so that when I logged out of the phone based session to 
m.facebook.com, I was also logged out of my web based session as well.

Even more interesting is that trying to login to facebook on two 
separate browser sessions won't work. I.e. if I login to facebook on one 
computer, and then login again on another computer, or on the same 
computer in a different browser (i.e. firefox for one session and i.e. 
for another), then the first session is dropped, which is good.

However, having a web browser based session, and a phone browser based 
session, doesn't seem to matter to facebook and I can have both open at 
the same time. There seems to be some potential to exploit there.

-Manny
(long time subscriber, but haven't posted since the late 90s)

On 1/16/2010 4:39 AM, Michael Scheidell wrote:
> AP Report says it was a 'routing problem'? any idea what they are
> talking about, do THEY know what they are talking about?
> Did AT&T mix up the destination ip addresses? did facebook NOT CHECK IP
> ADDRESS AND COOKIES and disable the session when the ip changed?
>
> <http://www.foxnews.com/scitech/2010/01/16/network-flaw-causes-scary-web-error/>
>
>
> SAN FRANCISCO – A Georgia mother and her two daughters logged onto
> Facebook from mobile phones last weekend and wound up in a startling
> place: strangers' accounts with full access to troves of private
> information.
>
> The glitch — the result of a routing problem at the family's wireless
> carrier, AT&T — revealed a little known security flaw with far reaching
> implications for everyone on the Internet, not just Facebook users.
>