About

Imported from CyberStrikeus/CyberStrike (.cyberstrike/skill/CIS_benchmarks/Server_Software/Kubernetes/CIS_Kubernetes_Benchmark_v1.11.0/cis-k8s-v1110-4.2.11/SKILL.md). Install upstream with npx skills add CyberStrikeus/CyberStrike --skill cis-k8s-v1110-4.2.11. Copyright stays with the author.

4.2.11 Verify that the RotateKubeletServerCertificate argument is set to true (Manual)

Name: cis-k8s-v1110-4.2.11
Author: CyberStrikeus

Profile Applicability

Level 1 - Worker Node

Description

Enable kubelet server certificate rotation.

Rationale

RotateKubeletServerCertificate causes the kubelet to both request a serving certificate after bootstrapping its client credentials and rotate the certificate as its existing credentials expire. This automated periodic rotation ensures that the there are no downtimes due to expired certificates and thus addressing availability in the CIA security triad.

Note: This recommendation only applies if you let kubelets get their certificates from the API server. In case your kubelet certificates come from an outside authority/tool (e.g. Vault) then you need to take care of rotation yourself.

Impact

None

Audit

Ignore this check if serverTLSBootstrap is true in the kubelet config file or if the --rotate-server-certificates parameter is set on kubelet Run the following command on each node:

ps -ef | grep kubelet

Verify that RotateKubeletServerCertificate argument exists and is set to true.

Remediation

Edit the kubelet service file /etc/kubernetes/kubelet.conf on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable.

--feature-gates=RotateKubeletServerCertificate=true

Based on your system, restart the kubelet service. For example:

systemctl daemon-reload
systemctl restart kubelet.service

Default Value

By default, kubelet server certificate rotation is enabled.

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.10 Encrypt Sensitive Data in Transit		x	x
v7	14.4 Encrypt All Sensitive Information in Transit		x	x

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/cyberstrikeus-cyberstrike-cis-k8s-v1110-4-2-11/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

cyberstrikeus-cyberstrike-cis-k8s-v1110-4-2-11.ocm.jsonjson

{
  "ocm": "1",
  "id": "cyberstrikeus-cyberstrike-cis-k8s-v1110-4-2-11",
  "kind": "skill",
  "name": "cis-k8s-v1110-4.2.11",
  "description": "Verify that the RotateKubeletServerCertificate argument is set to true (Manual)",
  "publisher": "CyberStrikeus",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "general"
    ],
    "tags": [
      "skill-md",
      "cis",
      "kubernetes",
      "worker-node",
      "kubelet",
      "rotate-kubelet-server-certific",
      "certificate-rotation",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Verify that the RotateKubeletServerCertificate argument is set to true (Manual)"
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/CyberStrikeus/CyberStrike",
      "path": ".cyberstrike/skill/CIS_benchmarks/Server_Software/Kubernetes/CIS_Kubernetes_Benchmark_v1.11.0/cis-k8s-v1110-4.2.11/SKILL.md",
      "ref": "df28ccd3dc6d6c02391169121ee2dcdf4a6a132b",
      "url": "https://github.com/CyberStrikeus/CyberStrike/blob/df28ccd3dc6d6c02391169121ee2dcdf4a6a132b/.cyberstrike/skill/CIS_benchmarks/Server_Software/Kubernetes/CIS_Kubernetes_Benchmark_v1.11.0/cis-k8s-v1110-4.2.11/SKILL.md",
      "key": "CyberStrikeus/CyberStrike/.cyberstrike/skill/CIS_benchmarks/Server_Software/Kubernetes/CIS_Kubernetes_Benchmark_v1.11.0/cis-k8s-v1110-4.2.11/SKILL.md"
    }
  },
  "instructions": "# 4.2.11 Verify that the RotateKubeletServerCertificate argument is set to true (Manual)\n\n## Profile Applicability\n\n- Level 1 - Worker Node\n\n## Description\n\nEnable kubelet server certificate rotation.\n\n## Rationale\n\n`RotateKubeletServerCertificate` causes the kubelet to both request a serving certificate after bootstrapping its client credentials and rotate the certificate as its existing credentials expire. This automated periodic rotation ensures that the there are no downtimes due to expired certificates and thus addressing availability in the CIA security triad.\n\nNote: This recommendation ",
  "cost": {
    "context_tokens": 567
  }
}

Fetch it by URL: GET /api/v1/registry/cyberstrikeus-cyberstrike-cis-k8s-v1110-4-2-11/manifest?version=1.0.0

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