STIGQter: STIG Summary: Microsoft Windows Defender Firewall with Advanced Security Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 09 Nov 2023:

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

DISA Rule

SV-242004r922958_rule

Vulnerability Number

V-242004

Group Title

SRG-OS-000327-GPOS-00127

Rule Version

WNFWA-000024

Severity

CAT II

CCI(s)

• CCI-001190 - Fail to an organization-defined known-system state for the following failures on the indicated components while preserving organization-defined system state information in failure.

Weight

10

Fix Recommendation

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 Defender Firewall with Advanced Security >> Windows Defender Firewall with Advanced Security >> Windows Defender Firewall Properties (this link will be in the right pane) >> Public Profile tab >> Settings (select Customize) >> Rule merging, "Apply local firewall rules:" to "No".

Check Contents

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: AllowLocalPolicyMerge

Type: REG_DWORD
Value: 0x00000000 (0)

Vulnerability Number

V-242004

Documentable

False

Rule Version

WNFWA-000024

Severity Override Guidance

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: AllowLocalPolicyMerge

Type: REG_DWORD
Value: 0x00000000 (0)

Check Content Reference

M

Target Key

5363