full-disclosure - Another minor facebook security flaw

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Message-ID: <1316495063.16860.YahooMailClassic@web122503.mail.ne1.yahoo.com>
Date: Mon, 19 Sep 2011 22:04:23 -0700 (PDT)
From: James Fife <theriverfife@...oo.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Another minor facebook security flaw

I noticed a recent flaw in Facebooks security resolution process recently. After being asked to confirm my identity simply because I was using a different computer, I apparently took too long to identify my friends in their photos. However, I was able to try two more times before being locked out. In which case Facebook provided the exact same photos with the same selection of people to name in order to confirm my identity. What this means is that I could conceivably attempt to logon to a victims Facebook account from an unauthorized device to get such a prompt, and then take my time to research the answers.Twenty minutes was the approximate time before my session expired, which gives roughly one hour to come up with the answers. This may not seem terribly difficult given the proclivity with which people tag their friends or publish photos on blogs. It would be even easier if the victim and attacker had a mutual friend in common on Facebook, as they
 would likely be able to see a lot more photos. In fact, perhaps even searching each name in Facebook could show the face, which would allow for the questions to be answered correctly.This isn’t a minor flaw in any sense of the word, however it does seem quite possibly that the process as it is now implemented could be abused in conjunction with other vulnerabilities to gain access to someone’s account. I hope that at the least this will foster some interesting discussion on why what I have described is a non issue, or result in a fix.
Taken from : http://allthatiswrong.wordpress.com/2011/09/19/another-minor-facebook-security-issue/

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