[Openid-specs-ab] OpenID Connect Logout using HTTP GET

John Bradley ve7jtb at ve7jtb.com
Sun Feb 15 16:22:41 UTC 2015

It might be used as a denial of service via xsrf.

I originally wanted to make the id_token_hint required to prevent that sort of thing from working.  
That was softened to a RECOMMENDED in the Session Management spec. 

I suspect a compromise might be for the IdP to prompt the user if the request doesn’t contain a valid id_token_hint.

John B.

> On Feb 15, 2015, at 1:08 PM, Torsten Lodderstedt <torsten at lodderstedt.net> wrote:
> Hi,
> why do you consider this a risk? 
> kind regards,
> Torsten.
> Am 14.02.2015 um 10:05 schrieb Thomas Broyer:
>> Hi,
>> Isn't there a risk of an attacker logging a user out of a third-party (victim) site just by loading that logout_url? At a minimum the RP should check the request's origin or referrer but AFAIK this wouldn't be reliable with such cross-origin requests (at least for older browsers not sending an Origin header), but maybe the OP could compute some value based on a shared secret, or use a signed JWT, and pass it as a query string parameter to "authenticate" the request?
>> Le sam. 14 févr. 2015 07:12, Mike Jones <Michael.Jones at microsoft.com <mailto:Michael.Jones at microsoft.com>> a écrit :
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