Microsoft Windows Server 2019

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

STIG ID: WN19-SO-000300 | SRG: SRG-OS-000073-GPOS-00041 | Severity: High | CCI: CCI-004062,CCI-000196 | Vulnerability ID: V-205654

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.

Check

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: NoLMHashValue Type: REG_DWORDValue: 0x00000001 (1)

Fix

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".