Azure VM Disk Volumes BYOK Encryption Not Enabled

ID: azure-vm-byok-disk-volumes-not-enabled

Severity: high

Author: princechaddha

Tags: cloud,devops,azure,microsoft,virtual-machine,azure-cloud-config

Description

Ensure that your Azure virtual machine disk volumes are using customer-managed keys (also known as Bring Your Own Keys - BYOKs) instead of service-managed keys (default keys used by Microsoft Azure for disk encryption), in order to have a more granular control over your VM data encryption/decryption process.

YAML Source

id: azure-vm-byok-disk-volumes-not-enabled
info:
  name: Azure VM Disk Volumes BYOK Encryption Not Enabled
  author: princechaddha
  severity: high
  description: |
    Ensure that your Azure virtual machine disk volumes are using customer-managed keys (also known as Bring Your Own Keys - BYOKs) instead of service-managed keys (default keys used by Microsoft Azure for disk encryption), in order to have a more granular control over your VM data encryption/decryption process.
  impact: |
    Using service-managed keys for disk encryption could limit your control over encryption keys and the security of your data.
  remediation: |
    Configure your VM disk volumes to use customer-managed keys (BYOK) to ensure better security and control over your data encryption and decryption processes.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-machines/disks-enable-customer-managed-keys
  tags: cloud,devops,azure,microsoft,virtual-machine,azure-cloud-config

flow: |
  code(1);
  for (let VmData of iterate(template.vmList)) {
    VmData = JSON.parse(VmData);
    set("ids", VmData.id);
    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 encryption show --ids "$ids" --query 'disks[*].encryptionSettings[*].keyEncryptionKey.keyUrl'

    matchers:
      - type: word
        part: stderr
        words:
          - "Azure Disk Encryption is not enabled"

    extractors:
      - type: dsl
        dsl:
          - 'ids + " is not using BYOK for disk encryption"'
# digest: 4a0a0047304502201e3e3f2ef89cc5446cdb6216b43dce53420b938647afb4782b4810e1ce84ad81022100de1b06e236b835b4567e41a29255f78b68c1ab99db53810c5d7471fd79e56247:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/azure/virtualmachines/azure-vm-byok-disk-volumes-not-enabled.yaml"

View on Github