Windows Server 2019 must be configured to prevent the storage of the LAN Manager hash of passwords.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-205654	WN19-SO-000300	SV-205654r569188_rule		High

Description
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.

STIG	Date
Microsoft Windows Server 2019 Security Technical Implementation Guide	2022-03-01

Details

Check Text ( C-5919r354880_chk )
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)

Fix Text (F-5919r354881_fix)
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".