No, we haven't, and in fact we can't with the protocol as it stands
today.  Please go read Eran's blog post explaining the attack:

http://www.hueniverse.com/hueniverse/2009/04/explaining-the-oauth-session-fixation-attack.html#more

On Fri, Apr 24, 2009 at 9:30 AM, Zachary Voase
<[email protected]> wrote:
>
> But we've pretty much solved *that* issue with signed/pre-specified
> callbacks and the once-only rule for exchanging request tokens.
>
> On Apr 24, 6:25 pm, Dossy Shiobara <[email protected]> wrote:
>> On 4/24/09 12:18 PM, Zachary Voase wrote:
>>
>> > But I think people are missing the idea that the consumer can just use
>> > sessions and cookies to ensure that the browser which asked for the
>> > request token is the same as the one which is authenticating it.
>> > There's no need whatsoever for callback tokens, etc.
>>
>> I think you're missing the fact that the attacker is the one using the
>> consumer.  The victim is just sent to SP to authorize the attacker's
>> token with _the victim's_ identity, which then makes the attacker's
>> session at the consumer access the victim's resources at the SP.
>>
>> --
>> Dossy Shiobara              | [email protected] |http://dossy.org/
>> Panoptic Computer Network   |http://panoptic.com/
>>    "He realized the fastest way to change is to laugh at your own
>>      folly -- then you can let go and quickly move on." (p. 70)
> >
>

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