Title

The Juniper router must be configured to have all inactive interfaces disabled. (Cat III impact)

Discussion

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.

Check Content

Review the router configuration and verify that inactive interfaces have been disabled as shown below. interfaces { ge-1/1/0 { disable; unit 0 { } } If an interface is not being used but is configured or enabled, this is a finding.

Fix Text

Disable all inactive interfaces as shown below. [edit interfaces] set ge-1/1/0 disable

Additional Identifiers

Rule ID: SV-217016r604135_rule

Vulnerability ID: V-217016

Group Title: SRG-NET-000019-RTR-000007

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.