From: Security Guy (security@sligoinc.com)
Date: Mon Mar 05 2007 - 13:25:37 EST
Indeed, I assume you're talking about cached passwords on Windows
systems on a domain.
see http://www.irongeek.com/i.php?page=security/cachecrack
Cracking requires local admin privs to get to the reg keys that
contain the hashes in the first place, but not hard if you've got
physical access to the target, or can remotely setup an elevation
attack.
On 3/5/07, Michael Hendrickx <Michael.Hendrickx@du.ae> wrote:
> 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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