The Kubernetes kubelet config must be owned by root.

STIG ID: CNTR-K8-003240  |  SRG: SRG-APP-000516-CTR-001330 |  Severity: medium |  CCI: CCI-000366 |  Vulnerability Id: V-242457

Vulnerability Discussion

The Kubernetes kubelet agent registers nodes with the API Server and performs health checks to containers within pods. If this file can be modified, the information system would be unaware of pod or container degradation.

Check

Review the Kubernetes Kubeadm kubelet conf file by using the command:

stat -c %U:%G /var/lib/kubelet/config.yaml| grep -v root:root

If the command returns any non root:root file permissions, this is a finding.

Fix

Change the ownership of the kubelet config to "root: root" by executing the command:

chown root:root /var/lib/kubelet/config.yaml
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