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The setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to Enabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-225043 WN16-SO-000240 SV-225043r569186_rule 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 server will negotiate SMB packet signing as requested by the client. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188
STIG Date
Microsoft Windows Server 2016 Security Technical Implementation Guide 2022-03-01

Details

Check Text ( C-26734r466031_chk )
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\LanManServer\Parameters\

Value Name: EnableSecuritySignature

Value Type: REG_DWORD
Value: 0x00000001 (1)
Fix Text (F-26722r466032_fix)
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".