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

From Windows 8 Security Technical Implementation Guide

Part of SMB Client Packet Signing (Always)

Associated with IA controls: ECSC-1

SV-48132r1_rule The Windows SMB client 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 client will only communicate with an SMB server 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 Client: Digitally sign communications (always)" to "Enabled".

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