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Message-ID: <4C63FE87.2030808@zerial.org> Date: Thu, 12 Aug 2010 10:00:39 -0400 From: "Zerial." <fernando@...ial.org> To: full-disclosure@...ts.grok.org.uk Subject: Re: Facebook name extraction based on email/wrong password + POC -----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. > 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/ - -- Zerial Seguridad Informatica Blog: http://blog.zerial.org Skype: erzerial Jabber: zerial@...beres.org GTalk: fernando@...ial.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) 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/
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