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The Cisco router must be configured to have all inactive interfaces disabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-216556 CISC-RT-000060 SV-216556r531085_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 Router RTR Security Technical Implementation Guide 2022-09-14

Details

Check Text ( C-17791r287055_chk )
Review the router configuration and verify that inactive interfaces have been disabled as shown below.

interface GigabitEthernet3
shutdown
!
interface GigabitEthernet4
shutdown

If an interface is not being used but is configured or enabled, this is a finding.
Fix Text (F-17787r287056_fix)
Disable all inactive interfaces as shown below.

R4(config)#interface GigabitEthernet3
R4(config-if)#shutdown
R4(config)#interface GigabitEthernet4
R4(config-if)#shutdown