azure-aks-cni-not-configured: Azure AKS Not Using CNI Mode

id: azure-aks-cni-not-configured
info:
  name: Azure AKS Not Using CNI Mode
  author: princechaddha
  severity: medium
  description: |
    Ensure that Azure Kubernetes Service (AKS) clusters are configured to use the Azure Container Networking Interface (CNI) mode instead of the default Kubenet networking mode to enhance the segregation of resources and controls in an enterprise environment.
  impact: |
    Using the default Kubenet networking mode instead of Azure CNI can lead to less efficient resource control and segregation, which might pose a risk to enterprise environments.
  remediation: |
    Configure AKS clusters to use Azure CNI by setting the networkProfile.networkPlugin to 'azure' during AKS cluster setup or update the existing AKS clusters to use Azure CNI.
  reference:
    - https://docs.microsoft.com/en-us/azure/aks/configure-azure-cni
  tags: cloud,devops,azure,microsoft,aks,azure-cloud-config

flow: |
  code(1);
  for (let clusterData of iterate(template.clusterList)) {
    clusterData = JSON.parse(clusterData);
    set("name", clusterData.name);
    set("resourceGroup", clusterData.resourceGroup);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az aks list --output json --query '[*].{name:name, resourceGroup:resourceGroup}'

    extractors:
      - type: json
        name: clusterList
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      az aks show --name "$name" --resource-group "$resourceGroup" --query 'networkProfile.networkPlugin'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "kubenet"

    extractors:
      - type: dsl
        dsl:
          - 'name + " in " + resourceGroup + " is using Kubenet instead of Azure CNI"'
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