V-269872

Discussion

The route processor handles traffic destined to the router—the key component used to build forwarding paths and is also instrumental with all network management functions. Hence, any disruption or denial-of-service (DoS) attack to the route processor can result in mission critical network outages.

Check Content

Review the access control list (ACL) or filter for the router receive path and verify that it will only process specific management plane and control plane traffic from specific sources.

Step 1: Examine the interface configuration for the control plane ACLs applied to the traffic destined to the router control plane from the OOBM management port or front panel data ports.

!
control-plane
 ip access-group MGMT_TRAFFIC_FROM_OOBM mgmt in
 ip access-group MGMT_TRAFFIC_FROM_DATA data in

Step 2: Review the control plane ACLs verify traffic is limited appropriately.

!
ip access-list MGMT_TRAFFIC_FROM_OOBM
 seq 10 permit ...
 seq 20 permit ...
 seq 30 deny ... log
 seq 40 deny ... log

!
ip access-list MGMT_TRAFFIC_FROM_DATA
 seq 10 permit ...
 seq 20 permit ...
 seq 30 deny ... log
 seq 40 deny ... log

If the router is not configured with a receive-path filter to restrict traffic destined to itself, this is a finding.