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As a result of a penetration testing process, I’ve been advised to lock cookies to the machine it was set on to stop it from being transferred and used to login elsewhere.
The app is Rails based.
Does anyone know how I would go about doing this?
While you can’t really lock a cookie to a single machine, you CAN ensure that a particular cookie is only used by a particular IP address, which is usually what people mean with this security tip. It’s best to maintain that mapping in the server-side session data, rather than storing that information in the cookie itself (since otherwise someone could just edit the cookie anyway).