OAuth Security Advisory 2009.1. It’s a show-stopper: an attacker can start an OAuth permission request flow from a consumer site, then trick another user from the same site in to completing that flow and hence authorising the attacker to act on their behalf. A fix to the spec is forthcoming; in the meantime, don’t start an OAuth flow from an untrusted location.
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Why would anyone ever start an OAuth flow from an untrusted location? >:(
Jeremy Dunck - 23rd April 2009 20:10 - #