azure-database-tier-cmk-absent: Customer-Managed Key Not Configured for Azure Database Tier

id: azure-database-tier-cmk-absent
info:
  name: Customer-Managed Key Not Configured for Azure Database Tier
  author: princechaddha
  severity: high
  description: |
    Ensure that a Customer-Managed Key (CMK), also known as Bring Your Own Key (BYOK), is created and configured for your Microsoft Azure database tier to meet cloud security and compliance requirements within your organization. This check verifies if Azure database resources tagged with specific values use a CMK.
  impact: |
    Not using a Customer-Managed Key for your database tier can lead to non-compliance with security standards and regulations, potentially increasing security risks.
  remediation: |
    Configure a Customer-Managed Key for your Azure database tier by setting the appropriate policies through Azure portal or using Azure CLI.
  reference:
    - https://docs.microsoft.com/en-us/azure/key-vault/keys/about-keys
  tags: cloud,devops,azure,microsoft,azure-key-vault,azure-cloud-config

flow: |
  code(1);
  for (let vaultName of iterate(template.vaultNames)) {
    set("vaultName", vaultName);
    code(2);
    for (let keyId of iterate(template.keyIds)) {
      set("keyId", keyId);
      code(3);
    }
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az keyvault list --query '[*].name' --output json

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

  - engine:
      - sh
      - bash
    source: |
      az keyvault key list --vault-name $vaultName --query '[?(attributes.enabled==`true`)].kid' --output json

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

  - engine:
      - sh
      - bash
    source: |
      az keyvault key show --id $keyId --query 'tags' --output json

    matchers:
      - type: word
        words:
          - '{}'

    extractors:
      - type: dsl
        dsl:
          - 'vaultName + " key " + keyId + " does not have required database-tier tags"'
# digest: 4a0a00473045022062891d81a2a23965f104832c126d959bfd643dd788dfa07e0c4d2e1a9a28102602210083a572774728728179488ce7e1650a3aa0d1b28db3c8b215cdb9961058ec17af:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.