The Cisco router must be configured to have all inactive interfaces disabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-216740 | CISC-RT-000060 | SV-216740r531087_rule | Low |
| Description |
| An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. Unauthorized personnel with access to the communication facility could gain access to a router by connecting to a configured interface that is not in use. If an interface is no longer used, the configuration must be deleted and the interface disabled. For sub-interfaces, delete sub-interfaces that are on inactive interfaces and delete sub-interfaces that are themselves inactive. If the sub-interface is no longer necessary for authorized communications, it must be deleted. |
| STIG | Date |
| Cisco IOS XR Router RTR Security Technical Implementation Guide | 2024-08-22 |
Details
| Check Text (C-17972r288612_chk) |
| Review the router configuration and verify that inactive interfaces have been disabled as shown below. interface GigabitEthernet0/0/1/0 shutdown ! interface GigabitEthernet0/0/1/1 shutdown If an interface is not being used but is configured or enabled, this is a finding. |
| Fix Text (F-17970r288613_fix) |
| Disable all inactive interfaces as shown below. R4(config)#interface GigabitEthernet3 R4(config-if)#shutdown R4(config)#interface GigabitEthernet4 R4(config-if)#shutdown |