cis-k8s-v1120-1-2-19

name	cis-k8s-v1120-1.2.19
description	Ensure that the --audit-log-maxsize argument is set to 100 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	1.2.19
cis_benchmark	CIS Kubernetes Benchmark v1.12.0
tech_stack	["kubernetes"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

1.2.19 Ensure that the --audit-log-maxsize argument is set to 100 or as appropriate (Automated)

Profile Applicability

• Level 1 - Master Node

Description

Rotate log files on reaching 100 MB or as appropriate.

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-maxsize argument is set to 100 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-maxsize parameter to an appropriate size in MB. For example, to set it as 100 MB:

--audit-log-maxsize=100

Default Value

By default, auditing is not enabled.

References

1. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
2. https://kubernetes.io/docs/tasks/debug/debug-cluster/audit/
3. 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		*	*