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Message-ID: <AANLkTikmWUfS_X8oGC2UbS6cjVEGBYyiVPorrOdSKSRt@mail.gmail.com>
Date: Thu, 12 Aug 2010 20:53:49 +0200
From: Samuel Martín Moro <faust64@...il.com>
To: "Zerial." <fernando@...ial.org>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Facebook name extraction based on email/wrong
password + POC
or they signed up to the list...
Samuel Martín Moro
{EPITECH.} tek5
CamTrace S.A.S
"Nobody wants to say how this works.
Maybe nobody knows ..."
Xorg.conf(5)
On Thu, Aug 12, 2010 at 4:00 PM, Zerial. <fernando@...ial.org> wrote:
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> This bug appears in a spanish security news site:
>
>
> http://blog.segu-info.com.ar/2010/08/error-en-facebook-permite-extraer.html
>
> probably it was reported by someone
>
> cheers
>
>
>
>
>
>
> On 08/11/10 23:13, werew01f wrote:
> > Don't seems to work on my system. No user name or picture was displayed.
> >
> >
> > On Wed, Aug 11, 2010 at 5:01 PM, Atul Agarwal <atul@...fence.com
> > <mailto: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 <http://www.secfence.com>
> >
> > _______________________________________________
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> >
> >
> >
> > _______________________________________________
> > Full-Disclosure - We believe in it.
> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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>
> - --
> Zerial
> Seguridad Informatica
> Blog: http://blog.zerial.org
> Skype: erzerial
> Jabber: zerial@...beres.org
> GTalk: fernando@...ial.org
>
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> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>
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_______________________________________________
Full-Disclosure - We believe in it.
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