| name | cis-k8s-v1111-4.1.7 |
| description | Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Manual) |
| category | cis-k8s |
| version | 1.11.1 |
| author | cyberstrike-official |
| tags | ["cis","kubernetes","worker-nodes","configuration-files","permissions","ownership","kubelet","kubeconfig","certificates"] |
| cis_id | 4.1.7 |
| cis_benchmark | CIS Kubernetes Benchmark v1.11.1 |
| tech_stack | ["kubernetes"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
4.1.7 Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Manual)
Profile Applicability
Description
Ensure that the certificate authorities file has permissions of 644 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 644 or more restrictive.
Remediation
Run the following command to modify the file permissions of the --client-ca-file
chmod 644 <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 |
