cis-k8s-v1110-1.1.20

DevOps & Security

Ensure that the Kubernetes PKI certificate file permissions are set to 644 or more restrictive (Manual)

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1.1.20 Ensure that the Kubernetes PKI certificate file permissions are set to 644 or more restrictive (Manual)

Profile Applicability

Level 1 - Master Node

Description

Ensure that Kubernetes PKI certificate files have permissions of 644 or more restrictive.

Rationale

Kubernetes makes use of a number of certificate files as part of the operation of its components. The permissions on these files should be set to 644 or more restrictive to protect their integrity and confidentiality.

Impact

None

Audit

Run the below command (based on the file location on your system) on the Control Plane node. For example,

stat -c '%a' /etc/kubernetes/pki/*.crt

Verify that the permissions are 644 or more restrictive.

ls -l /etc/kubernetes/pki/*.crt

Verify -rw------

Remediation

Run the below command (based on the file location on your system) on the Control Plane node. For example,

chmod -R 644 /etc/kubernetes/pki/*.crt

Default Value

By default, the certificates used by Kubernetes are set to have permissions of 644

References

https://kubernetes.io/docs/admin/kube-apiserver/

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts - Restrict administrator privileges to dedicated administrator accounts on enterprise assets. Conduct general computing activities, such as internet browsing, email, and productivity suite use, from the user's primary, non-privileged account.	*	*	*
v7	4 Controlled Use of Administrative Privileges - Controlled Use of Administrative Privileges