The Kubernetes kubelet staticPodPath must not enable static pods.
An XCCDF Rule
Description
<VulnDiscussion>Allowing kubelet to set a staticPodPath gives containers with root access permissions to traverse the hosting filesystem. The danger comes when the container can create a manifest file within the /etc/kubernetes/manifests directory. When a manifest is created within this directory, containers are entirely governed by the Kubelet not the API Server. The container is not susceptible to admission control at all. Any containers or pods that are instantiated in this manner are called "static pods" and are meant to be used for pods such as the API server, scheduler, controller, etc., not workload pods that need to be governed by the API Server.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-242397r960792_rule
- Severity
- High
- References
- Updated
Remediation - Manual Procedure
On each Control Plane and Worker node, run the command:
ps -ef | grep kubelet
Note the path to the config file (identified by --config).
Edit the Kubernetes kubelet file in the --config directory on the Kubernetes Control Plane and Worker nodes. Remove the setting "staticPodPath".