The Windows Firewall with Advanced Security must block unicast responses to multicast or broadcast messages when connected to a private network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17431	WNFWA-000015	SV-54892r1_rule	ECSC-1	Medium

Description
A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Unicast responses to multicast or broadcast messages for a private connection will be blocked. This helps minimize the risk of an attacker using broadcast or multicast traffic to deliver malicious payloads.

STIG	Date
Windows Firewall with Advanced Security Security Technical Implementation Guide	2014-09-19

Details

Check Text ( None )
None

Fix Text (F-47760r1_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".