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

[ghost <ghosts () gmail com>]

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 () zerial 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 () secfence com
> > <mailto:atul () secfence 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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> >
> >
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>
> - --
> Zerial
> Seguridad Informatica
> Blog: http://blog.zerial.org
> Skype: erzerial
> Jabber: zerial () jabberes org
> GTalk: fernando () zerial org
>
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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