cis-k8s-v1110-1.3.4

DevOps & Security

Ensure that the --service-account-private-key-file argument is set as appropriate (Automated)

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1.3.4 Ensure that the --service-account-private-key-file argument is set as appropriate (Automated)

Profile Applicability

Level 1 - Master Node

Description

Explicitly set a service account private key file for service accounts on the controller manager.

Rationale

To ensure that keys for service account tokens can be rotated as needed, a separate public/private key pair should be used for signing service account tokens. The private key should be specified to the controller manager with --service-account-private-key-file as appropriate.

Impact

You would need to securely maintain the key file and rotate the keys based on your organization's key rotation policy.

Audit

Run the following command on the Control Plane node:

ps -ef | grep kube-controller-manager

Verify that the --service-account-private-key-file argument is set as appropriate.

Remediation

Edit the Controller Manager pod specification file /etc/kubernetes/manifests/kube-controller-manager.yaml on the Control Plane node and set the --service-account-private-key-file parameter to the private key file for service accounts.

--service-account-private-key-file=<filename>

Default Value

By default, --service-account-private-key-file it not set.

References

https://kubernetes.io/docs/admin/kube-controller-manager/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.2 Use Unique Passwords	X	X	X
v7	4.4 Use Unique Passwords		X	X
v6	14 Controlled Access Based on the Need to Know