Windows Server 2022 must be configured to prevent the storage of the LAN Manager hash of passwords.

STIG ID: WN22-SO-000300 |  SRG: SRG-OS-000073-GPOS-00041 |  Severity: high |  CCI:  | Vulnerability Id: V-254474

Vulnerability Discussion

The LAN Manager hash uses a weak encryption algorithm and there are several tools available that use this hash to retrieve account passwords. This setting controls whether a LAN Manager hash of the password is stored in the SAM the next time the password is changed.

Check

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network security: Do not store LAN Manager hash value on next password change to "Enabled".

Fix

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\

Value Name: NoLMHash

Value Type: REG_DWORD
Value: 0x00000001 (1)