cis-k8s-v1110-1.4.2

DevOps & Security

Ensure that the --bind-address argument is set to 127.0.0.1 (Automated)

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

Profile Applicability

Level 1 - Master Node

Description

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

Audit

Run the following command on the Control Plane node:

ps -ef | grep kube-scheduler

Verify that the --bind-address argument is set to 127.0.0.1

Remediation

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

References

https://kubernetes.io/docs/reference/command-line-tools-reference/kube-scheduler/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	12.6 Use of Secure Network Management and Communication Protocols		X	X
v7	9.2 Ensure Only Approved Ports, Protocols and Services Are Running		X	X