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OpenID has Attribute Exchange, Facebook has Facebook Connect, and authorization services such as Oauth enable access to user data distributed across a range of content providers.

What are the security challenges that these services face?

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This sounds like a homework essay rather than a question for a Q&A forum like this one. You think you could winnow this down a bit to something more specific? –  tylerl Sep 27 '12 at 0:16
    
You're right, thanks for the comment. I've reduced the scope of this one and added a new one here, security.stackexchange.com/questions/20746/…. –  Daniel Sep 27 '12 at 0:49
    
It still feels a little too broad to me. StackExchange as a whole has a preference for strictly answerable questions, whereas this seems like any number of questions could be correct. –  Scott Pack Sep 27 '12 at 3:00
    
I'm open to suggestions. I noticed there wasn't much discussion of attribute exchange on here so I wanted to kick things off :-) –  Daniel Sep 27 '12 at 5:21

1 Answer 1

At the end of the day the client (usually a browser) still needs a token to maintain a session (usually with a cookie variable). If the attacker gets this token, by XSS or OWASP A9 then they can access the same resources. CSRF is also a concern.

Now this is assuming that these authentication providers are totally immune from attack. If a flaw exists in one of these services, you are also in trouble. SQL Injection, Phishing, Insecure backups, lack of brute force protection are just a few concerns.

oauzz is an oauth fuzzer, which can uncover serious flaws in an oauth implementation.

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