The setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-225039	WN16-SO-000190	SV-225039r569186_rule		Medium

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 client will only communicate with an SMB server that performs SMB packet signing. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

STIG	Date
Microsoft Windows Server 2016 Security Technical Implementation Guide	2022-03-01

Details

Check Text ( C-26730r466019_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\LanmanWorkstation\Parameters\ Value Name: RequireSecuritySignature Value Type: REG_DWORD Value: 0x00000001 (1)

Fix Text (F-26718r466020_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (always)" to "Enabled".