The Cisco switch must be configured to have all inactive layer 3 interfaces disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-221076	CISC-RT-000060	SV-221076r622190_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 switch 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.

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 switch 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 NX-OS Switch RTR Security Technical Implementation Guide	2021-03-29

Details

Check Text ( C-22791r409717_chk )
Review the switch configuration and verify that inactive interfaces have been disabled as shown below: interface Ethernet4/12 shutdown no switchport interface Ethernet4/13 shutdown no switchport … … … interface Ethernet4/48 shutdown no switchport If an interface is not being used but is configured or enabled, this is a finding.

Fix Text (F-22780r409718_fix)
Disable all inactive interfaces as shown below: SW1(config)# int e4/1 - 11 SW1(config-if-range)# shutdown SW1(config-if-range)# end