azure-aks-use-private-kv: Azure AKS Encryption at Rest Not Using Private Key Vault

id: azure-aks-use-private-kv
info:
  name: Azure AKS Encryption at Rest Not Using Private Key Vault
  author: princechaddha
  severity: high
  description: |
    Ensure that your Azure Kubernetes Service (AKS) clusters are configured with encryption at rest for Kubernetes secrets in etcd using a private Azure Key Vault.
  impact: |
    If AKS clusters use a public key vault for secret data encryption, it may expose sensitive data to unauthorized access, leading to potential security risks.
  remediation: |
    Configure your AKS clusters to use private Azure Key Vaults for encryption at rest by setting the 'azureKeyVaultKms.keyVaultNetworkAccess' to 'Private'.
  reference:
    - https://docs.microsoft.com/en-us/azure/aks/developer-best-practices-resource-management
  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 'securityProfile.azureKeyVaultKms.keyVaultNetworkAccess'

    matchers:
      - type: word
        words:
          - "Public"

    extractors:
      - type: dsl
        dsl:
          - 'name + " in " + resourceGroup + " does not use a private Key Vault for encryption at rest"'
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