9.1.3 (L1) Ensure 'Windows Firewall: Domain: Outbound connections' is set to 'Allow (default)'

Information

This setting determines the behavior for outbound connections that do not match an outbound firewall rule.

The recommended state for this setting is: Allow (default)

Some people believe that it is prudent to block all outbound connections except those specifically approved by the user or administrator. Microsoft disagrees with this opinion, blocking outbound connections by default will force users to deal with a large number of dialog boxes prompting them to authorize or block applications such as their web browser or instant messaging software. Additionally, blocking outbound traffic has little value because if an attacker has compromised the system they can reconfigure the firewall anyway.

Solution

To establish the recommended configuration via GP, set the following UI path to Allow (default) :

Computer Configuration\Policies\Windows Settings\Security Settings\Windows Defender Firewall with Advanced Security\Windows Defender Firewall with Advanced Security\Windows Firewall Properties\Domain Profile\Outbound connections

Impact:

None - this is the default behavior.

See Also

https://workbench.cisecurity.org/benchmarks/15290

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7, 800-53|SC-7(5), CSCv7|9.4, CSCv7|11.2

Plugin: Windows

Control ID: 9379057320e32ff0558a2091b7534d91092b54575b002174679a5b043c90a57f