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Local firewall rules for the Windows Firewall must not be merged with group policy rules for the Domain Profile.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17422 5.457 SV-18478r2_rule ECSC-1 Medium
Description
A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Merging local firewall rules with group policy firewall rules may weaken intended group policy firewall configurations.
STIG Date
Windows Vista Security Technical Implementation Guide 2013-03-14

Details

Check Text ( C-45365r1_chk )
If the following registry value does not exist or is not configured as specified, this is a finding:

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

Value Name: AllowLocalPolicyMerge

Type: REG_DWORD
Value: 0

If the Windows Firewall is used and the system is not a member of a domain, the Domain Profile requirements can be marked NA.

If a third-party firewall is used, verify a comparable setting has been implemented.

The Remote Endpoint STIG contains additional firewall requirements for systems used remotely.
Fix Text (F-41930r2_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) -> Rule merging, "Apply local firewall rules" to "No".

Configure a comparable setting if a third-party firewall is used.