Title

The Windows Server SMB client is not enabled to always perform SMB packet signing. (Cat II impact)

Discussion

If this policy is enabled, it causes the Windows Server Message Block (SMB) client to perform SMB packet signing when communicating with an SMB server that is enabled or required to perform SMB packet signing.

Check Content

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “Microsoft Network Client: Digitally sign communications (always)” is not set to “Enabled”, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanmanWorkstation\Parameters\ Value Name: RequireSecuritySignature Value Type: REG_DWORD Value: 1

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Microsoft Network Client: Digitally sign communications (always)” to “Enabled”.

Additional Identifiers

Rule ID: SV-7074r1_rule

Vulnerability ID: V-6832

Group Title: SMB Client Packet Signing (Always)

Expert Comments

CCIs tied to check.

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