Re: Whitepaper "SESSION RIDING - A Widespread Vulnerability in To day's Web Applications"

* Noah Gray:

> 1) Most sites use some form of Session Expiration. The whole of this paper
> assumes the when the user is attacked, they are still logged in, and have a
> valid session cookie intact. In reality, this attack is only useful while a
> user is logged in, and shortly thereafter. Which, while being very plausible
> in intranet application, is unlikely in internet applications, except in
> focused attacks.

Not true if you attack web-based email services. 8-) There are rumors
that some of them are vulnerable, and they make very interesting
targets these days.

> Other than that, this is very plausible attack that I would agree hasn't
> received enough attention. I would also add that in the case of the img tag
> in the email, an iframe could also be used, similar to recent viruses. It
> needn't even be visible.

A style sheet link has been reported to work as well, even in clients
that don't retrieve external images.