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

Rotate log files on reaching 100 MB or as appropriate. 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.

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Risk Level: Low
Cloud Entity: Pods
CloudGuard Rule ID: D9.K8S.LOG.04
Covered by Spectral: Yes
Category: Compute

GSL LOGIC

KubernetesPod where labels contain [value='kube-apiserver'] and namespace = 'kube-system' should have spec.containers with [parsedArgs contain [key like 'audit-log-maxsize' and value >= 100]]

REMEDIATION

Edit the API server pod specification file $apiserverconf
on the master 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

References

  1. https://kubernetes.io/docs/admin/kube-apiserver/
  2. https://kubernetes.io/docs/concepts/cluster-administration/audit/
  3. https://github.com/kubernetes/features/issues/22

Pods

Pods are the smallest deployable units of computing that can be created and managed in Kubernetes.A Pod is a group of one or more containers (such as Docker containers), with shared storage/network, and a specification for how to run the containers.

Compliance Frameworks

  • CIS Kubernetes Benchmark v1.20
  • CIS Kubernetes Benchmark v1.23
  • CIS Kubernetes Benchmark v1.24
  • CIS Kubernetes Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.5.1
  • CIS Kubernetes Benchmark v1.6.1
  • Kubernetes NIST.SP.800-190
  • Kubernetes v.1.13 CloudGuard Best Practices
  • Kubernetes v.1.14 CloudGuard Best Practices

Updated 7 months ago