Microsoft Windows Server 2019

Windows Server 2019 setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to Enabled

STIG ID: WN19-SO-000200 | SRG: SRG-OS-000423-GPOS-00187 | Severity: Medium | CCI: CCI-002418,CCI-002421 | Vulnerability ID: V-205828

Description

The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB server will negotiate SMB packet signing as requested by the client.Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Check

C-6093r355846_chk

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

Fix

F-6093r355847_fix

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".