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The Windows Firewall must allow outbound connections, unless a rule explicitly blocks the connection for the Private Profile.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17429 5.464 SV-18485r2_rule ECSC-1 Medium
Description
A firewall provides a line of defense against attack. To be effective, it must be enabled and properly configured. Outbound connections are allowed on a private network, unless a rule explicitly blocks the connection. This allows normal outbound communication which could be restricted as necessary with additional rules.
STIG Date
Windows Vista Security Technical Implementation Guide 2013-10-01

Details

Check Text ( C-45379r1_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\PrivateProfile\

Value Name: DefaultOutboundAction

Type: REG_DWORD
Value: 0

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-41944r2_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 -> State, "Outbound connections" to "Allow (default)".

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