RE: ADS Password Storage Protection

["Roger A. Grimes" <roger () banneretcs com>]

To be accurate, there is an LM hash of every Windows logon password, but
if LM hashes are disabled or if the password is over 14 characters long,
what is placed in the LM hash field is an null LM hash (i.e. fake hash)
that is very recognizable and useless.

-----Original Message-----
From: dave kleiman [mailto:dave () davekleiman com] 
Sent: Friday, July 21, 2006 12:17 PM
To: security-basics () securityfocus com
Subject: RE: ADS Password Storage Protection

Jeff,

You response is a no go, maybe you are unaware of how the LM store
works.

"garzelfloposaurus" there would be no LM hash of this password nor of my
old king passphrase example, because LM is limited to 14 characters.

That is where you are mixing up the getting the first half and guessing
the second. 

If you did have the first, how would you guess what portion of the rhyme
I used, what punctuation I used, and how long the passphrase was?


Dave




    -----Original Message-----
    From: Jeffrey F. Bloss [mailto:jbloss () tampabay rr com] 
    Sent: Wednesday, July 19, 2006 14:51
    To: security-basics () securityfocus com
    Subject: Re: ADS Password Storage Protection
    
    dave kleiman wrote:
    
    > Eric,
    > 
    > I beg to differ.
    > 
    > Are you suggesting that a 40-60 character passphrase 
    "&Old King Cole 
    > was a merry old soul, a merry old soul was he; he called 
    for his pipe, 
    > he called for his bowl!!" is not more secure than "$%Op13f987&"
    
    In some ways yes, and in some ways no. :)
    
    The essence of the LM Hash vulnerability is being able to 
    derive an entire pass phrase from a portion. Since pass 
    phrases were hashed in "chunks" it was possible to crack a 
    smaller chunk and potentially guess the rest from that 
    information. If you discovered the text "garzel" and knew a 
    pet's name was "garzelfloposaurus"... :)
    
    Your Old King Cole example suffers from the same weakness. 
    It wouldn't take long to figure out the rest if we knew the 
    "&Old Ki" part. And of course "&Old Ki" is less secure than 
    "$%Op13f987&" in every way.
    
    --
    Hand crafted on 19 July, 2006 at 14:41:28 EDT
    
    Does the name Pavlov ring a bell?
    


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This list is sponsored by: Norwich University

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education and the case study affords you unmatched consulting experience.
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without disrupting your career or home life.

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