The Cisco ISR 4000 Series router must enforce that the managed network domain and the management network domain are separate routing domains and the Interior Gateway Protocol instances are not redistributed or advertised to each other.

From Cisco IOS XE Release 3 RTR Security Technical Implementation Guide

Associated with: CCI-001414

SV-88789r1_rule The Cisco ISR 4000 Series router must enforce that the managed network domain and the management network domain are separate routing domains and the Interior Gateway Protocol instances are not redistributed or advertised to each other.

Vulnerability discussion

If the gateway router is not a dedicated device for the out-of-band management network, several safeguards must be implemented for containment of management and production traffic boundaries, otherwise, it is possible that management traffic will not be separated from production traffic. Since the managed network and the management network are separate routing domains, separate Interior Gateway Protocol routing instances must be configured on the router, one for the managed network and one for the out-of-band management network. In addition, the routes from the two domains must not be redistributed to each other.

Check content

Verify the Interior Gateway Protocol instance used for the managed network on the Cisco ISR 4000 Series router does not redistribute routes into the Interior Gateway Protocol instance used for the management network, and vice versa. The configuration will look similar to the example below: router ospf 1 area 1 authentication message-digest redistribute ospf 1 vrf Mgmt passive-interface default no passive-interface GigabitEthernet0/0 no passive-interface GigabitEthernet0/1 network 200.30.3.0 0.0.0.255 area 1 If the Interior Gateway Protocol instance used for the managed network redistributes routes into the Interior Gateway Protocol instance used for the management network, or vice versa, this is a finding.

Fix text

On the Cisco ISR 4000 Series router configure the Interior Gateway Protocol instance used for the managed network to prohibit redistribution of routes into the Interior Gateway Protocol instance used for the management network, and vice versa. Use the “NO” form of the redistribute command to disable redistribution of the management network. For example: ISR4000(config-router)#no redistribute ospf 1 vrf Mgmt

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