[Openid-specs-ab] Scope Attack

John Bradley ve7jtb at ve7jtb.com
Thu Apr 21 20:01:28 UTC 2011

I think it is a IdP UI issue.   The grant of a user-ID token needs to be clearly separated from the user info endpoint grant and other grants.

I don't know how far we want to go with being specific about UI.   I would be tempted to recommend that the UI be granular enough to allow individual scopes to be denied.

Personally I don't give Facebook enabled apps access because I don't have a way to turn off posting to my feed when they ask for a bunch of grants.   

I think it probably should be left up to the IdP to decide on the best interface.

John B.
On 2011-04-21, at 12:57 PM, Nat Sakimura wrote:

> Hi. 
> I was tweeting with a friend of mine in Japanese about attacker disguising to be just requesting authentication and a bit more and in fact getting fairly large access privilege. 
> For example, let the client request scope=openid%20readwirte saying that "Please login by clicking this button" or login icon. 
> The use is redirected to the client and presses OK without reading about what you are about to give up. 
> He is just thinking that it is authentication - not a big deal, and only at a later date that something is massively wrong. 
> What can we do to mitigate this problem? 
> -- 
> Nat Sakimura (=nat)
> http://www.sakimura.org/en/
> http://twitter.com/_nat_en
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