The Windows SMB client must be configured to always perform SMB packet signing.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6832	WN12-SO-000028	SV-52935r2_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.

STIG	Date
Windows Server 2012 / 2012 R2 Member Server Security Technical Implementation Guide	2016-12-19

Details

Check Text ( C-47240r2_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: 1

Fix Text (F-45861r1_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".