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Re: NTLM HTTP Authentication is insecure by design - a new writeup by Am

Subject: Re: NTLM HTTP Authentication is insecure by design - a new writeup by Amit Klein
Date: Wed, 20 Jul 2005 13:52:38 +1000
With respect,

SSL should always be terminated in front of a Web server is illustrated in
our technology whitepaper already mentioned above:
(http://www.seclutions.com/en/downloads/AirLock_Whitepaper.pdf).

Terminating SSL sessions before the web server assumes that no client- side certificates are in use. If you use client-side certificates (either soft certs or smart cards), terminating early means that the web app has to trust the front end termination device to provide the authentication details from the client.


Pretty much all solutions to this usually involve setting headers (like REMOTE_USER or iv-cred similar) and passing on the request. If the header or token is not present for unauthenticated requests, an attacker can spoof the (say) REMOTE_USER header successfully.

Andrew

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