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

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of SMB Server Packet Signing (if client agrees)

SV-32513r1_rule The Windows SMB server will perform SMB packet signing when possible.

Vulnerability discussion

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

Check content

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 (if client agrees)” 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: EnableSecuritySignature Value Type: REG_DWORD Value: 1

Fix text

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”.

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