From: Matthew Webster (awakenings@mindspring.com)
Date: Mon Mar 05 2007 - 07:17:23 EST
Michael,
Yes, I am aware of the difficulties. I want to find out, can it be done? How effective would a brute force attack be? What is the risk?
Thanks,
Matt
-----Original Message-----
>From: Michael Hendrickx <Michael.Hendrickx@du.ae>
>Sent: Mar 5, 2007 1:42 AM
>To: Matthew Webster <awakenings@mindspring.com>, pen-test <pen-test@securityfocus.com>
>Subject: RE: Windows XP salted hashed verification of domain passwords
>
>Dear,
>
>MD4 is a one way hash, though cryptographic collisions are found against
>it, the clear text password cannot be derived straight away, unless a
>brute force attack is performed against the hashes.
>
>Thanks,
>
>Michael Hendrickx
>Senior Applications & Systems Analyst - Enterprise IT Security
>Technology security & Risk Management
>
>
>Emirates Integrated Telecommunications Company, PJSC
>P.O. Box 502666, Dubai, U.A.E.
>
>Tel (Dir) : +971 4 3693919
>Fax : +971 4 3604414
>www.du.ae
>-----Original Message-----
>From: listbounce@securityfocus.com [mailto:listbounce@securityfocus.com]
>On Behalf Of Matthew Webster
>Sent: Saturday, March 03, 2007 12:12 AM
>To: pen-test
>Subject: Windows XP salted hashed verification of domain passwords
>
>Folks,
>
> For domain accounts, the passwords are not kept on a system. The
>verification is salted and hashed with md4 twice. I am trying to assess
>the following risks. 1) What is the danger that that verification could
>be misused on another system? 2) From that salted, hashed verification,
>can the password be derived? How likely is this?
>
> Also, how would one perform a pen test against those salted, hashed
>verifications? Lets assume in the registry no one was ignorant enough
>to put the registry key which provides the password.
>
>Thanks,
>
>Matt
>
>
>
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