The Windows Firewall with Advanced Security must log dropped packets when connected to a public network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-242007	WNFWA-000028	SV-242007r698262_rule		Low

Description
A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Logging of dropped packets for a public network connection will be enabled to maintain an audit trail of potential issues.

STIG	Date
Microsoft Windows Firewall with Advanced Security Security Technical Implementation Guide	2021-10-15

Details

Check Text ( C-45282r698260_chk )
If the firewall's Public Profile is not enabled (see V-17417), this requirement is also a finding. If the following policy-based registry value exists and is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\WindowsFirewall\PublicProfile\Logging\ Value Name: LogDroppedPackets Type: REG_DWORD Value: 0x00000001 (1) If the policy-based registry value does not exist, verify the following registry value. If it is not configured as specified, this is a finding. Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\PublicProfile\Logging\ Value Name: LogDroppedPackets Type: REG_DWORD Value: 0x00000001 (1)

Check Text ( C-45282r698260_chk )

If the firewall's Public Profile is not enabled (see V-17417), this requirement is also a finding.

If the following policy-based registry value exists and is not configured as specified, this is a finding.

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\WindowsFirewall\PublicProfile\Logging\

Value Name: LogDroppedPackets

Type: REG_DWORD
Value: 0x00000001 (1)

If the policy-based registry value does not exist, verify the following registry value. If it is not configured as specified, this is a finding.

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\PublicProfile\Logging\

Value Name: LogDroppedPackets

Type: REG_DWORD
Value: 0x00000001 (1)

Fix Text (F-45241r698261_fix)
The preferred method of configuring the firewall settings is with a policy, particularly in a domain environment. 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 -> Logging (select Customize), "Log dropped packets" to "Yes". In addition to using policies, systems may also be configured using the firewall GUI or Netsh commands. These methods may be more appropriate for standalone systems. The configuration settings in the GUI are the same as those specified in the policy above. Windows Firewall Properties will be a link in the center pane after opening Windows Firewall with Advanced Security. The following Netsh commands may also be used to configure this setting: "Netsh advfirewall set publicprofile logging droppedconnections enable". Or "Netsh advfirewall set allprofiles logging droppedconnections enable".

Fix Text (F-45241r698261_fix)

The preferred method of configuring the firewall settings is with a policy, particularly in a domain environment.

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 -> Logging (select Customize), "Log dropped packets" to "Yes".

In addition to using policies, systems may also be configured using the firewall GUI or Netsh commands. These methods may be more appropriate for standalone systems.
The configuration settings in the GUI are the same as those specified in the policy above. Windows Firewall Properties will be a link in the center pane after opening Windows Firewall with Advanced Security.

The following Netsh commands may also be used to configure this setting:
"Netsh advfirewall set publicprofile logging droppedconnections enable".
Or
"Netsh advfirewall set allprofiles logging droppedconnections enable".