The Windows Firewall with Advanced Security local connection rules must not be merged with Group Policy settings when connected to a public network.

From Windows Firewall with Advanced Security Security Technical Implementation Guide

Part of Windows Firewall Public - Local Connection Rules

Associated with: CCI-001190

SV-54918r3_rule The Windows Firewall with Advanced Security local connection rules must not be merged with Group Policy settings when connected to a public network.

Vulnerability discussion

A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Local connection rules will not be merged with Group Policy settings on a public network to prevent Group Policy settings from being changed.

Check content

If the system is not a member of a domain, this is NA. If the firewall's Public Profile is not enabled (see V-17417), this requirement is also a finding. Verify the registry value below. If this registry value does not exist or is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\WindowsFirewall\PublicProfile\ Value Name: AllowLocalIPsecPolicyMerge Type: REG_DWORD Value: 0x00000000 (0)

Fix text

If the system is not a member of a domain, this is NA. Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Windows Firewall with Advanced Security -> Windows Firewall with Advanced Security -> Windows Firewall Properties (this link will be in the right pane) -> Public Profile Tab -> Settings (select Customize) -> Rule merging, "Apply local connection security rules:" to "No".

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