Virtual Machine Disk Encryption with Customer-Managed Keys Not Enabled

ID: gcloud-vm-disk-cmk-not-enabled

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,compute,encryption,cmk,security,gcp-cloud-config

Description

Ensure that the persistent disks attached to your Google Compute Engine instances are encrypted with Customer-Managed Keys (CMKs) in order to have a fine control over your sensitive data encryption and decryption process. You can create and manage your own Customer-Managed Keys (CMKs) with Cloud Key Management Service (Cloud KMS). Cloud KMS provides secure and efficient encryption key management, controlled key rotation, and revocation mechanisms.

YAML Source

id: gcloud-vm-disk-cmk-not-enabled

info:
  name: Virtual Machine Disk Encryption with Customer-Managed Keys Not Enabled
  author: princechaddha
  severity: high
  description: |
    Ensure that the persistent disks attached to your Google Compute Engine instances are encrypted with Customer-Managed Keys (CMKs) in order to have a fine control over your sensitive data encryption and decryption process. You can create and manage your own Customer-Managed Keys (CMKs) with Cloud Key Management Service (Cloud KMS). Cloud KMS provides secure and efficient encryption key management, controlled key rotation, and revocation mechanisms.
  impact: |
    Without CMK encryption, you have limited control over the encryption keys used to protect your VM disk data, potentially exposing sensitive information to unauthorized access.
  remediation: |
    Configure your Compute Engine persistent disks to use Customer-Managed Keys (CMKs) for encryption by specifying a Cloud KMS key during disk creation or by updating existing disks.
  reference:
    - https://cloud.google.com/compute/docs/disks/customer-managed-encryption
  tags: cloud,devops,gcp,gcloud,compute,encryption,cmk,security,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let instance of iterate(template.instances)){
      instance = JSON.parse(instance)
      set("instanceName", instance.name)
      set("zone", instance.zone)
      code(3)
      for(let disk of iterate(template.disks)){
        set("diskName", disk)
        code(4)
      }
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud compute instances list --project $projectId --format="json(name,zone.basename())"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud compute instances describe $instanceName --zone $zone --project $projectId --format="json(disks[].deviceName)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud compute disks describe $diskName --zone $zone --project $projectId --format="json(diskEncryptionKey.kmsKeyName)" | jq '. // "null"'

    matchers:
      - type: word
        words:
          - "null"

    extractors:
      - type: dsl
        dsl:
          - '"Disk " + diskName + " attached to instance " + instanceName + " in zone " + zone + " of project " + projectId + " is not encrypted with a Customer-Managed Key (CMK)"'
# digest: 4a0a00473045022100d7cb21540269edd4582afb6f1dcf363463e4568e14154ec5c1fcb0877cd58a2a022005ee32cf0459ad463e162bcc6293991b6bb9dc9d1177233733f6d6f4c41b64cd: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/gcp/compute/gcloud-vm-disk-cmk-not-enabled.yaml"

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