Kubelet protect-kernel-defaults set to false

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Metadata

Id: 6cf42c97-facd-4fda-b8af-ea4529123355

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Medium

Category: Insecure Configurations

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Description

The --protect-kernel-defaults flag must be set to true.
If kubelet is started via a container command, the command must not include --protect-kernel-defaults=false.
For KubeletConfiguration resources, the protectKernelDefaults field must be defined and set to true.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet"]
      args: ["--protect-kernel-defaults=true"]
  restartPolicy: OnFailure

{
    "kind": "KubeletConfiguration",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "port": 10250,
    "readOnlyPort": 10255,
    "cgroupDriver": "cgroupfs",
    "protectKernelDefaults": true,
    "hairpinMode": "promiscuous-bridge",
    "serializeImagePulls": false,
    "featureGates": {
      "RotateKubeletClientCertificate": true,
      "RotateKubeletServerCertificate": true
    }
  }

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet"]
      args: []
  restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet","--protect-kernel-defaults=false"]
      args: []
  restartPolicy: OnFailure

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
protectKernelDefaults: false
serializeImagePulls: false
tlsCertFile: "someFile.txt"
tlsPrivateKeyFile: "someFile.txt"
evictionHard:
    memory.available:  "200Mi"

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
tlsCertFile: "someFile.txt"
tlsPrivateKeyFile: "someFile.txt"
evictionHard:
    memory.available:  "200Mi"