Title

Outgoing secure channel traffic is not signed when possible. (Cat II impact)

Discussion

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but the channel is not integrity checked. If this policy is enabled, all outgoing secure channel traffic should be signed.

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 “Domain Member: Digitally sign secure channel data (when possible)” 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\Netlogon\Parameters\ Value Name: SignSecureChannel Value Type: REG_DWORD Value: 1 Note: If the value for “Domain Member: Digitally encrypt or sign secure channel data (always)” is set to “Enabled”, then this would not be a finding.

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Domain Member: Digitally sign secure channel data (when possible)” to “Enabled”.

Additional Identifiers

Rule ID: SV-1164r1_rule

Vulnerability ID: V-1164

Group Title: Signing of Secure Channel Traffic

Expert Comments

CCIs tied to check.

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