Microsoft Windows Server 2016

The setting Microsoft network client: Digitally sign communications (if server agrees) must be configured to Enabled

STIG ID: WN16-SO-000200 | SRG: SRG-OS-000423-GPOS-00187 | Severity: Medium | CCI: CCI-002418,CCI-002421 | Vulnerability ID: V-225040

Description

The server message block (SMB) protocol provides the basis for many network operations. If this policy is enabled, the SMB client will request packet signing when communicating with an SMB server that is enabled or required to perform SMB packet signing.Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Check

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\Services\LanmanWorkstation\Parameters\Value Name: EnableSecuritySignatureValue Type: REG_DWORDValue: 0x00000001 (1)

Fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (if server agrees)" to "Enabled".