When protecting the boundaries of a network, the firewall must be placed between the private network and the perimeter router and the Demilitarized Zone (DMZ).

From Network Infrastructure Policy Security Technical Implementation Guide

Part of Firewall placement is not IAW the Network STIG.

Associated with: CCI-000262 CCI-002073

SV-8552r3_rule When protecting the boundaries of a network, the firewall must be placed between the private network and the perimeter router and the Demilitarized Zone (DMZ).

Vulnerability discussion

The only way to mediate the flow of traffic between the inside network, the outside connection, and the DMZ is to place the firewall into the architecture in a manner that allows the firewall the ability to screen content for all three destinations.

Check content

Review the network topology diagrams and visually inspect the firewall location to validate correct position on the network. If the firewall is not positioned between the perimeter router and the private network and between the perimeter router and the DMZ, this is a finding. Exception: If the perimeter security for the enclave or B/C/P/S is provisioned via the JRSS, then this requirement is not applicable.

Fix text

Move the firewall into the prescribed location to allow for enforcement of the Enclave Security Policy and allow for all traffic to be screened.

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