Windows Firewall Private Profile - Block unicast responses to multicast or broadcast messages.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17431	5.466	SV-25233r1_rule	ECSC-1	Medium

Description
This check blocks unicast responses to multicast or broadcast messages on a private network.

STIG	Date
Windows 7 Security Technical Implementation Guide	2012-07-02

Details

Check Text ( C-18160r1_chk )
If the following registry value doesn’t exist or is not configured as specified, then this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \Software\Policies\Microsoft\WindowsFirewall\PrivateProfile\ Value Name: DisableUnicastResponsesToMulticastBroadcast Type: REG_DWORD Value: 1 Note: If a third-party firewall is used, document this with the IAO and mark the Windows firewall settings as Not Applicable. The Desktop/Secure Remote Computing STIGs contain additional requirements for systems used remotely.

Check Text ( C-18160r1_chk )

If the following registry value doesn’t exist or is not configured as specified, then this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Subkey: \Software\Policies\Microsoft\WindowsFirewall\PrivateProfile\

Value Name: DisableUnicastResponsesToMulticastBroadcast

Type: REG_DWORD
Value: 1

Note: If a third-party firewall is used, document this with the IAO and mark the Windows firewall settings as Not Applicable. The Desktop/Secure Remote Computing STIGs contain additional requirements for systems used remotely.

Fix Text (F-17345r1_fix)
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) -> Private Profile Tab -> Settings (select Customize) -> Unicast response, “Allow unicast response” to “No”.