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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-55731	SRG-NET-000019-RTR-000007	SV-69985r3_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.

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
Router Security Requirements Guide	2020-06-30

Details

Check Text ( C-56297r3_chk )
Review the router configuration. If an interface is not being used but is configured or enabled, this is a finding.

Fix Text (F-60601r3_fix)
Delete inactive sub-interfaces and disable and delete the configuration of any inactive ports on the router.