cis-k8s-v1110-4.1.7

DevOps & Security

Ensure that the certificate authorities file permissions are set to 600 or more restrictive (Manual)

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4.1.7 Ensure that the certificate authorities file permissions are set to 600 or more restrictive (Manual)

Profile Applicability

Level 1 - Worker Node

Description

Ensure that the certificate authorities file has permissions of 600 or more restrictive.

Rationale

The certificate authorities file controls the authorities used to validate API requests. You should restrict its file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.

Impact

None

Audit

Run the following command:

ps -ef | grep kubelet

Find the file specified by the --client-ca-file argument. Run the following command:

stat -c %a <filename>

Verify that the permissions are 600 or more restrictive.

Remediation

Run the following command to modify the file permissions of the --client-ca-file

chmod 600 <filename>

Default Value

By default no --client-ca-file is specified.

References

https://kubernetes.io/docs/admin/authentication/#x509-client-certs

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	x	x	x
v7	14.6 Protect Information through Access Control Lists	x	x	x