1.4.2 Ensure that the --bind-address argument is set to 127.0.0.1

Information

Do not bind the scheduler service to non-loopback insecure addresses.

Rationale:

The Scheduler API service which runs on port 10251/TCP by default is used for health and metrics information and is available without authentication or encryption. As such it should only be bound to a localhost interface, to minimize the cluster's attack surface

Impact:

None

Solution

Edit the Scheduler pod specification file /etc/kubernetes/manifests/kube-scheduler.yaml on the Control Plane node and ensure the correct value for the --bind-address parameter

Default Value:

By default, the --bind-address parameter is set to 0.0.0.0

See Also

https://workbench.cisecurity.org/files/4111

Item Details

Category: ACCESS CONTROL, SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|AC-18, 800-53|SC-23, CSCv7|9.2

Plugin: Unix

Control ID: 507fe96cf836910d8c2264ccd2f4025281e6a4def777e33485429afe74c21b6f