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

From Windows 8 Security Technical Implementation Guide

Part of SMB Server Packet Signing (Always)

Associated with IA controls: ECSC-1

SV-48133r1_rule The Windows SMB server must be configured to always perform SMB packet signing.

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 only communicate with an SMB client that performs SMB packet signing.

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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 (always)" to "Enabled".

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