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V-225043

CAT II (Medium)

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

Rule ID

SV-225043r958908_rule

STIG

Microsoft Windows Server 2016 Security Technical Implementation Guide

Version

V2R10

CCIs

CCI-002418 CCI-002421

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 server will negotiate SMB packet signing as requested by the client. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Check Content

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

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".