The perimeter firewall must filter traffic destined to the internal enclave in accordance with the guidelines contained in DoD Instruction 8551.1.

From Firewall Security Requirements Guide Requirements

Part of SRG-NET-000205-FW-000040

Associated with: CCI-001097

SRG-NET-000205-FW-000040_rule The perimeter firewall must filter traffic destined to the internal enclave in accordance with the guidelines contained in DoD Instruction 8551.1.

Vulnerability discussion

The enclave's internal network contains the servers where mission-critical data and applications reside. Malicious traffic can enter from an external boundary or originate from a compromised host internally.Vulnerability assessments must be reviewed by the SA and protocols must be approved by the IA staff before entering the enclave. Access Control Lists (ACLs) are the first line of defense in a layered security approach. They permit authorized packets and deny unauthorized packets based on port or service type. They enhance the posture of the network by not allowing packets to even reach a potential target within the security domain. The lists provided are highly susceptible ports and services that should be blocked or limited as much as possible without adversely affecting customer requirements. Auditing packets attempting to penetrate the network but stopped by an ACL will allow network administrators to broaden their protective ring and more tightly define the scope of operation. If the perimeter is in a Deny-by-Default posture and what is allowed through the filter is in accordance with DoD Instruction 8551.1, and if the permit rule is explicitly defined with explicit ports and protocols allowed, then all requirements related to the Ports, Protocols, Services Management (PPSM) database being blocked would be satisfied.

Check content

Review the perimeter firewall to verify it filters traffic destined to the internal enclave in accordance with the guidelines contained in DoD Instruction 8551.1. If the perimeter firewall does not filter traffic destined to the internal enclave in accordance with the guidelines contained in DoD Instruction 8551.1, this is a finding.

Fix text

Configure the perimeter firewall to filter traffic destined to the internal enclave in accordance with the guidelines contained in DoD Instruction 8551.1.

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