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Re: Cookie Security
From: Jørgen Hovelsen <jorgen.hovelsen () ntnu no>
Date: Wed, 30 Apr 2008 11:31:17 +0200

Red Davies wrote:

I simply have to sniff the session id cookie, and specify this from another client, and I am signed into the 
application as the associated user.

It is a very simple attack vector.  One that I've used successfully in
a pen-test.

One simple method which would make its use even harder would be to
encode the clients IP address in the token.  Then you can perform some
simple algorithm on your server to check if your remote client's IP
matches that which is encoded in your token.

If not, you know you it's stolen.

What if a user moves his/her computer to another location and gets another ip-address. Then the server would think its a stolen token, but in fact its not.

Jørgen H.

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