That pretty much sums it up. I just fiddled with the ways I could think 
to bypass the way Wt handles sessions in the context of BREACH. Couldn't 
think of anything.

-
Thomas

On 08/19/2013 01:24 PM, Chris Frey wrote:
> On Mon, Aug 19, 2013 at 09:57:14PM +0200, Koen Deforche wrote:
>> Since we do not rely on cookies, there is no need for CSRF tokens. The
>> BREACH attack doesn't really mention very well, IMHO, that it relies
>> on cookies for session tracking in the first place since that's the
>> starting point to trying to guess a secret in the page by generating
>> requests from the user's browser.
> Thanks very much for your reply!
>
> Yes, that makes more sense.  If I understand correctly, the entire attack
> relies on:
>
>       - the CSRF is given to the server via cookie automatically
>       - the CSRF consistently comes back to the user via HTML
>       - there is a similar feedback loop where the attacker can
>               provide his own ID in the URL, and it also comes back
>               via the HTML in some other place
>
> In Wt's case, there is generally no cookie value at all, and if the
> attacker guesses a different ID via URL, then it just starts a new
> session and that new ID comes back in the HTML.
>
> Is that close?
>
> Thanks,
> - Chris
>
>
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