CIS Benchmark for Azure Kubernetes Service (AKS)

What the official CIS Benchmark covers

The CIS Azure Kubernetes Service (AKS) Benchmark (NCP lists 1.7.0) is scoped to controls an AKS customer can change. Published structure aligned with Microsoft’s CIS attestation includes:

• Control Plane Components — largely informational / N/A for managed AKS
• Control Plane Configuration — for example logging-related expectations customers enable
• Worker Nodes — node configuration files and kubelet
• Policies — RBAC and service accounts, pod security, network policies/CNI, secrets, and general policies

Key hardening areas

Mapped to real CIS AKS sections, without listing individual recommendation IDs:

Control-plane logging & visibility

Enable and retain AKS control-plane logging themes from the Control Plane Configuration section.

Worker node & kubelet posture

Secure kubelet service and config permissions plus kubelet runtime expectations on customer nodes.

RBAC & service accounts

Least-privilege bindings and default service-account hygiene across namespaces.

Pod security & network policies

Pod security expectations and NetworkPolicy coverage where the CNI supports them.

Secrets & admission

Secrets handling and admission-control expectations that remain in customer scope.

Why manual CIS hardening is hard at scale

• Node-pool refreshes reintroduce kubelet and file-permission drift.
• Teams confuse AKS-scoped CIS with vanilla Kubernetes benchmarks.
• Policy exceptions proliferate across namespaces and subscriptions.
• Multi-subscription sprawl multiplies evidence packs without continuous scoring.

How CyberSilo’s CIS Benchmarking Tool helps

CyberSilo’s CIS Benchmarking Tool is built to turn “we have a PDF” into continuous configuration assessment:

• Map AKS clusters and nodes into an assessable inventory against CIS Benchmark expectations for the platform.
• Score posture and surface gaps across logging, worker, and policy themes.
• Detect configuration drift after upgrades or node-pool refreshes instead of waiting for the next audit scramble.
• Prioritise remediation work and keep exportable evidence for programmes that expect a hardened AKS baseline.

FAQ

Is there an official CIS Benchmark for AKS?

Yes. CIS publishes an Azure Kubernetes Service (AKS) Benchmark. Prefer that edition over generic Kubernetes CIS for managed AKS.

Can we just run kube-bench?

Generic kube-bench against managed AKS often reports false fails on control-plane items customers cannot change. Prefer the AKS-scoped benchmark.

Do Virtual nodes or Fargate-style patterns change scope?

Confirm node and workload applicability in the current CIS PDF for your cluster shape.

How does CyberSilo relate to the official CIS PDF?

The official CIS Benchmark remains the authoritative recommendation source. CyberSilo automates assessment, scoring, drift detection, and remediation tracking.