From: Ingo Struck (ingoingostruck.de)
Date: Thu Aug 14 2003 - 08:00:50 CDT

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Hi...

> I was interested in the possibilty of hijacking an existing,
> already logged-in, session via XSS vulnerabilities in the situation where a
> hidden form field is used to transmit the token.
Well, ok.
Regarding existing session stealing XSS attacks, there is really no difference
at all between a hidden form field and a cookie - both are equally accessible
from within javascript. So if the attacker can induce any xss payload on the
victim, it doesnt make much difference if you store the session token in a
cookie or in a hidden form field. They can both be read by a javascript and
then submitted using any common technique to a third location.
This also holds true for any SID stored in the URL.

Bottom line:
It is equally easy / difficult for an attacker who is able to induce xss
payload on the victim's browser to steal any existing SID be it stored
within cookie, hidden form field or URL.

(That means that you should encourage all your users to switch off all kind of
scripting and don't rely on it within your apps).

Kind regards

Ingo

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