Date: Fri, 13 Aug 2010 09:26:53 +0300
From: Burhan Çimen <burhancimen@...il.com>
To: ghost <ghosts@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Facebook name extraction based on email/wrong
 password + POC

Congrats, it is a nice finding and POC...
On a Turkish article it says Facebook patched this bug.

http://www.turk.internet.com/portal/yazigoster.php?yaziid=29003

Burhan CIMEN
IS Auditor




On Thu, Aug 12, 2010 at 11:17 PM, ghost <ghosts@...il.com> wrote:

> The great thing about these threads is you can killfile anybody in
> them and know you'll never miss anything useful.
>
> Please keep it going.
>
>
>
> On Thu, Aug 12, 2010 at 7:00 AM, Zerial. <fernando@...ial.org> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > 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>
> >>
> >>     _______________________________________________
> >>     Full-Disclosure - We believe in it.
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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
> >
> > -----BEGIN PGP SIGNATURE-----
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> > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> >
> > iEYEARECAAYFAkxj/oYACgkQIP17Kywx9JQRwgCfZCloGsZGESiYer3KXJ256Ahv
> > v+gAnjAgODKzFw5/inB+Q4JwULaX1p5P
> > =Rbq1
> > -----END PGP SIGNATURE-----
> >
> > _______________________________________________
> > Full-Disclosure - We believe in it.
> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> > Hosted and sponsored by Secunia - http://secunia.com/
> >
>
> _______________________________________________
> 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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