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List:       bugtraq
Subject:    Modifying NT credential and RAZOR's analysis of dvwsrr.dll
From:       Iván Arce <core.lists.bugtraq () CORE-SDI ! COM>
Date:       2000-04-27 0:37:23
[Download RAW message or body]

In light of Simple Nomad's post regarding the dvwsrr.dll overflow:

> Date:              Mon, 17 Apr 2000 16:06:37 -0500
> From:              Simple Nomad <thegnome@NMRC.ORG>
> To:                BUGTRAQ@SECURITYFOCUS.COM
>
>
> BindView RAZOR Team Analysis of DVWSSR.DLL Risks

[snip]
>
>
>  5. In theory if you can get the hash of a user with the access, you can
> exploit the buffer overflow. This is called "passing the hash", and
> essentially means that you use the hash without cracking the password to
> authenticate to the target server. See
> http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind9704&L=NTBUGTRAQ&P=R2734&D=0
> for details from RAZOR's Paul Ashton on the basis for this technique. This
> technique is currently one of the stars of Foundstone's "Hacking Exposed:
> Live" presentations being put on by George Kurtz and Eric Schultze at
> security shows around the globe. Certainly in theory this could be adapted
> to this exploit.

The details of the above 'technique' are described in Hernan Ochoa's
paper
published in the Guest Feature Forum at Security Focus:

<http://www.securityfocus.com/templates/forum_message.html?forum=2&head=1512&id=1512>

(warning: the URL might be wrapped by your viewer)

It is also available at our site:
<http://www.core-sdi.com/papers/NTcred.html>

-ivan


--
"Understanding. A cerebral secretion that enables one having it to know
 a house from a horse by the roof on the house,
 It's nature and laws have been exhaustively expounded by Locke,
 who rode a house, and Kant, who lived in a horse." - Ambrose Bierce


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