full-disclosure - Re: Facebook name extraction based on email/wrong password + POC

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Message-ID: <AANLkTi=4Obm+3+rRpCVie4D_cj+C2KAR5q0j_j-2X2O=@mail.gmail.com>
Date: Wed, 11 Aug 2010 11:17:01 +0200
From: Christian Sciberras <uuf6429@...il.com>
To: Atul Agarwal <atul@...fence.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Facebook name extraction based on email/wrong
	password + POC

It's supposed to be a "feature" :). Cool stuff you found this out.






On Wed, Aug 11, 2010 at 11:06 AM, Atul Agarwal <atul@...fence.com> wrote:

> Hello all,
>
> Sometime back, I noticed a strange problem with Facebook, I had
> accidentally entered wrong password in Facebook, and it showed my first and
> last name with profile picture, along with the password incorrect message. I
> thought that the fact that it was showing the name had something to do with
> cookies stored, so I tried other email id's, and it was the same. I wondered
> over the possibilities, and wrote a POC tool to test it.
>
> This script extracts the First and Last Name (provided by the users when
> they sign up for Facebook). Facebook is kind enough to return the name even
> if the supplied email/password combination is wrong. Further more,it also
> gives out the profile picture (this script does not harvest it, but its easy
> to add that too). Facebook users have no control over this, as this works
> even when you have set all privacy settings properly. Harvesting this data
> is very easy, as it can be easily bypassed by using a bunch of proxies.
>
> As Facebook is so popular, some implications -
>
> 1) Someone has a list of email address that he has no clue about. He can
> feed them to Facebook one by one (or in a list, using a script like this)
> and chances are that he'll get more than 50% hits. Useful for phishing
> attacks (People will get more convinced when they see their *real* names).
>
> 2) One can generate random email addresses, and *verify* their existence .
> Hint: You can generate emails using (common names + a corporate domain), and
> check them against Facebook. Might come handy in a Pentest.
>
> Rest is only left up to one's imagination.
>
> Find the POC script attached.
>
> PS: I did not report this, as I am unsure on what to call it, a "bug",
> "vuln" or a "feature".
>
> Thanks,
> Atul Agarwal
> Secfence Technologies
> www.secfence.com
>
>
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