Title

The Windows SMB server is not enabled to perform SMB packet signing when possible. (Cat II impact)

Discussion

If this policy is enabled, it causes the Windows Server Message Block (SMB) server 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 Server: Digitally sign communications (if client agrees)” 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\LanManServer\Parameters\ Value Name: EnableSecuritySignature 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 Server: Digitally sign communications (if Client agrees)” to “Enabled”.

Additional Identifiers

Rule ID: SV-1162r1_rule

Vulnerability ID: V-1162

Group Title: SMB Server Packet Signing (if client agrees)

Expert Comments

CCIs tied to check.

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