Title

The Windows Server SMB server 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) server to always 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 (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\LanManServer\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 Server: Digitally sign communications (always)” to “Enabled”.

Additional Identifiers

Rule ID: SV-7076r1_rule

Vulnerability ID: V-6833

Group Title: SMB Server Packet Signing (Always)

Expert Comments

CCIs tied to check.

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