Rule ID
SV-269859r1137913_rule
Version
V1R2
CCIs
CCI-001414
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 subinterfaces, delete subinterfaces that are on inactive interfaces and delete subinterfaces that are themselves inactive. If the subinterface is no longer necessary for authorized communications, it must be deleted.
Review the router configuration to verify that inactive interfaces have been disabled as shown below. ! interface ethernet1/1/6 shutdown no switchport ! interface ethernet1/1/7 shutdown no switchport If an interface is not being used but is configured or enabled, this is a finding.
Disable all inactive interfaces on the router as shown in the example below. OS10(config)# default interface ethernet 1/1/6 OS10(config)# interface ethernet 1/1/6 OS10(conf-if-eth1/1/6)# no switchport OS10(conf-if-eth1/1/6)# shutdown