The router must be configured to have all inactive interfaces disabled.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-207112
SRG-NET-000019-RTR-000007
SV-207112r604135_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.