The Windows Server SMB server is not enabled to always perform SMB packet signing.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6833	3.115	SV-29391r1_rule	ECSC-1	Medium

Description
If this policy is enabled, it causes the Windows Server Message Block (SMB) server to always perform SMB packet signing.

STIG	Date
Windows Vista Security Technical Implementation Guide	2015-09-01

Details

Check Text ( C-3112r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “Microsoft Network Server: Digitally sign communications (always)” is not set to “Enabled”, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\ Value Name: RequireSecuritySignature Value Type: REG_DWORD Value: 1

Check Text ( C-3112r1_chk )

Analyze the system using the Security Configuration and Analysis snap-in.
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for “Microsoft Network Server: Digitally sign communications (always)” is not set to “Enabled”, then this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Services\LanManServer\Parameters\

Value Name: RequireSecuritySignature

Value Type: REG_DWORD
Value: 1

Fix Text (F-6520r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Microsoft Network Server: Digitally sign communications (always)” to “Enabled”.