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WN25-SO-000160 The Windows Server 2025 setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to SC-8, SC-8(1) via CCI-002418, CCI-002421

Title

The Windows Server 2025 setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.

Control

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\ Value Name: RequireSecuritySignature Value Type: REG_DWORD Value: 0x00000001 (1)

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. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Related controls

CCI-002418, CCI-002421

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".