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

From Windows 8 Security Technical Implementation Guide

Part of SMB Server Packet Signing (if client agrees)

Associated with IA controls: ECSC-1

SV-48054r1_rule The Windows SMB server must perform SMB packet signing when possible.

Vulnerability discussion

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.

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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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