The firewall located behind the premise router must be configured to block all outbound management traffic.

From Firewall Security Technical Implementation Guide

Part of The firewall does not block outbound mgmt traffic

Associated with IA controls: ECSC-1

SV-19084r2_rule The firewall located behind the premise router must be configured to block all outbound management traffic.

Vulnerability discussion

The management network must still have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes such as routers and firewalls. Management traffic between the managed network elements and the management network is routed via the same links and nodes as that used for production or operational traffic. Safeguards must be implemented to ensure that the management traffic does not leak past the managed network's premise equipment. If there is a firewall located behind the premise router, then all management traffic must be blocked at that point--with the exception of management traffic destined to premise equipment.

Check content

Review the firewall configuration to verify that it is blocking all outbound management traffic. If the firewall is not blocking management network from leaking to outside networks, this is a finding.

Fix text

With the exception of management traffic destined to perimeter equipment, a firewall located behind the premise router must be configured to block all outbound management traffic.

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