Title

The router must be configured to only permit management traffic that ingresses and egresses the OOBM interface. (Cat II impact)

Discussion

The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interface of the managed network element will be directly connected to the OOBM network. An OOBM interface does not forward transit traffic, thereby providing complete separation of production and management traffic. Since all management traffic is immediately forwarded into the management network, it is not exposed to possible tampering. The separation also ensures that congestion or failures in the managed network do not affect the management of the device. If the device does not have an OOBM port, the interface functioning as the management interface must be configured so that management traffic does not leak into the managed network and that production traffic does not leak into the management network.

Check Content

Step 1: Verify that the managed interface has an inbound and outbound ACL configured. Step 2: Verify that the ingress filter only allows management, IGP, and ICMP traffic. Caveat: If the management interface is a true OOBM interface, this requirement is not applicable. If the router does not restrict traffic that ingresses and egresses the management interface, this is a finding.

Fix Text

If the management interface is a routed interface, it must be configured with both an ingress and egress ACL.

Additional Identifiers

Rule ID: SV-207144r604135_rule

Vulnerability ID: V-207144

Group Title: SRG-NET-000205

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.