The Windows SMB server must perform SMB packet signing when possible.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-1162	WN12-SO-000033	SV-52870r1_rule	ECSC-1	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 server will negotiate SMB packet signing as requested by the client.

STIG	Date
Windows Server 2012 Domain Controller Security Technical Implementation Guide	2014-01-07

Details

Check Text ( C-47187r2_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: EnableSecuritySignature Value Type: REG_DWORD Value: 1

Fix Text (F-45796r1_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".