V-253461 | The system must be configured to prevent t...

Microsoft Windows 11

The system must be configured to prevent the storage of the LAN Manager hash of passwords

STIG ID: WN11-SO-000195 | SRG: SRG-OS-000073-GPOS-00041 | Severity: High | CCI: CCI-004062,CCI-000196 | Vulnerability ID: V-253461

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 or not a LAN Manager hash of the password is stored in the SAM the next time the password is changed.

Check

C-56914r829465_chk

If the following registry value does not exist or is not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Control\Lsa\Value Name: NoLMHashValue Type: REG_DWORDValue: 1

Fix

F-56864r829466_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".