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Windows Server 2019 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-205828 WN19-SO-000200 SV-205828r569188_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 2019 Security Technical Implementation Guide 2020-10-26

Details

Check Text ( C-6093r355846_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-6093r355847_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".