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


Overview

Finding ID Version Rule ID IA Controls Severity
V-6832 WN08-SO-000028 SV-48132r1_rule ECSC-1 Medium
Description
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.
STIG Date
Windows 8 Security Technical Implementation Guide 2014-01-07

Details

Check Text ( C-44858r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for "Microsoft Network Client: Digitally sign communications (always)" is not set to "Enabled", this is a finding.

The policy referenced configures the following registry value:

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

Value Name: RequireSecuritySignature

Value Type: REG_DWORD
Value: 1
Fix Text (F-41269r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Microsoft Network Client: Digitally sign communications (always)" to "Enabled".