| name | cis-k8s-v1120-1.2.18 |
| description | Ensure that the --audit-log-maxbackup argument is set to 10 or as appropriate (Automated) |
| category | cis-k8s |
| version | 1.12.0 |
| author | cyberstrike-official |
| tags | ["cis","kubernetes","control-plane","api-server","audit","logging","log-rotation"] |
| cis_id | 1.2.18 |
| cis_benchmark | CIS Kubernetes Benchmark v1.12.0 |
| tech_stack | ["kubernetes"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
1.2.18 Ensure that the --audit-log-maxbackup argument is set to 10 or as appropriate (Automated)
Profile Applicability
Description
Retain 10 or an appropriate number of old log files.
Rationale
Kubernetes automatically rotates the log files. Retaining old log files ensures that you would have sufficient log data available for carrying out any investigation or correlation. If you have set file size of 100 MB and the number of old log files to keep as 10, you would approximate have 1 GB of log data that you could potentially use for your analysis.
Impact
None
Audit
Run the following command on the Control Plane node:
ps -ef | grep kube-apiserver
Verify that the --audit-log-maxbackup argument is set to 10 or as appropriate.
Remediation
Edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml on the Control Plane node and set the --audit-log-maxbackup parameter to 10 or to an appropriate value.
--audit-log-maxbackup=10
Default Value
By default, auditing is not enabled.
References
- https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
- https://kubernetes.io/docs/tasks/debug/debug-cluster/audit/
- https://github.com/kubernetes/enhancements/issues/22
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
| v8 | 8.3 Ensure Adequate Audit Log Storage | * | * | * |
| v7 | 6.4 Ensure adequate storage for logs | | * | * |
