There are a couple methods to removing LM hashes listed on the KB article I mentioned, I will quote the GPO method in case the link goes bad. Passwords are limited to a maximum of 14 characters in length.Password are split into 7 chars and hashed seperately, making brute force trivial.For those who might not be aware, some of the problems with LM's include: It is advised to disable LM hashes as the protocol is severely broken as you suggested. The LM response cannot be used to authenticate the user in this case.Ī response is still generated and placed in the LM Response field, The host or domain controller will not store the LM hash for the user In the event that the user's password is longer than 15 characters, It appears that the reason for this is due to the hashing limitations of LM, and not security related. Manager hash (LM hash) and a Windows NT hash (NT hash) of the That contains fewer than 15 characters, Windows generates both a LAN When you set or change the password for a user account to a password If you do not have any older clients on the network, then the cause for both hashes is most likely due to the password length being <15 characters. There' a pretty good Microsoft KB article on this exact subject.īasically, LM is used for compatibility with older clients.
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