9.2.2 Ensure 'Windows Firewall: Private: Inbound connections' is set to 'Block (default)'

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Information

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

The recommended state for this setting is: Block (default).

Rationale:

If the firewall allows all traffic to access the system then an attacker may be more easily able to remotely exploit a weakness in a network service.

Impact:

None - this is the default behavior.

Solution

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

Computer Configuration\Policies\Windows Settings\Security Settings\Windows Firewall with Advanced Security\Windows Firewall with Advanced Security\Windows Firewall Properties\Private Profile\Inbound connections

Default Value:

Block (default). (The Windows Firewall with Advanced Security will block all inbound connections that do not match an inbound firewall rule in this profile.)

See Also

https://workbench.cisecurity.org/files/3719