Title

The system must be configured to prevent the storage of the LAN Manager hash of passwords. (Cat I impact)

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

Check Content

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: 1

Fix Text

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".

Additional Identifiers

Rule ID: SV-225505r877397_rule

Vulnerability ID: V-225505

Group Title: SRG-OS-000073-GPOS-00041

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.