azure-vm-unmanaged-disk-volumes: Azure VM Unmanaged Disk Volumes Detected

id: azure-vm-unmanaged-disk-volumes
info:
  name: Azure VM Unmanaged Disk Volumes Detected
  author: princechaddha
  severity: medium
  description: |
    Ensure that your Microsoft Azure virtual machines (VMs) are configured to use managed disk volumes for reliable, efficient, and simplified disk management. A managed disk is an abstraction of current Standard/Premium storage disk in Azure Storage. Managed disks provide granular access control with RBAC and better reliability for the virtual machines deployed within an Azure Availability Set.
  impact: |
    Using unmanaged disk volumes can lead to less efficient management and potential reliability issues in disk access within Azure VMs.
  remediation: |
    Configure your Azure VMs to use managed disks for better reliability and simplified management of disk resources.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-machines/managed-disks-overview
  tags: cloud,devops,azure,microsoft,virtual-machine,azure-cloud-config

flow: |
  code(1);
  for (let VMData of iterate(template.vmList)) {
    set("ids", VMData);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az vm list --query '[*].{"id":id}'

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

  - engine:
      - sh
      - bash
    source: |
      az vm show --ids "$ids" --query 'storageProfile.{"osDiskType":osDisk.managedDisk.id,"dataDiskType":dataDisks[*].managedDisk.id}'

    matchers:
      - type: word
        words:
          - 'null'
          - '[]'

    extractors:
      - type: dsl
        dsl:
          - 'ids + " is not using managed OS/data disk volume(s)"'
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