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


Overview

Finding ID Version Rule ID IA Controls Severity
V-17421 WNFWA-000007 SV-54867r1_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 in the domain 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 2014-01-07

Details

Check Text ( C-48645r2_chk )
If the system is not a member of a domain, the Domain Profile requirements can be marked NA.

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\DomainProfile\

Value Name: DisableUnicastResponsesToMulticastBroadcast

Type: REG_DWORD
Value: 1
Fix Text (F-47735r1_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) -> Domain Profile Tab -> Settings (select Customize) -> Unicast response, "Allow unicast response" to "No".