Pub/Sub Topics Not Encrypted with Customer-Managed Encryption Keys

ID: gcloud-pubsub-cmek-disabled

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-pubsub,gcp-cloud-config

Description

Ensure that your Google Cloud Pub/Sub topics are encrypted using Customer-Managed Encryption Keys (CMEKs) to have full control over the data encryption and decryption process. Customer-Managed Encryption Keys (CMEKs) allow you to create and manage your own encryption keys with Cloud Key Management Service (Cloud KMS).

YAML Source

id: gcloud-pubsub-cmek-disabled

info:
  name: Pub/Sub Topics Not Encrypted with Customer-Managed Encryption Keys
  author: princechaddha
  severity: high
  description: |
    Ensure that your Google Cloud Pub/Sub topics are encrypted using Customer-Managed Encryption Keys (CMEKs) to have full control over the data encryption and decryption process. Customer-Managed Encryption Keys (CMEKs) allow you to create and manage your own encryption keys with Cloud Key Management Service (Cloud KMS).
  impact: |
    Not using CMEKs for Pub/Sub topics can result in less control over data encryption and potential exposure to unauthorized access.
  remediation: |
    Configure your Pub/Sub topics to use Customer-Managed Encryption Keys (CMEKs) by specifying a Cloud KMS key during the topic creation or update process.
  reference:
    - https://cloud.google.com/pubsub/docs/encryption
  tags: cloud,devops,gcp,gcloud,google-cloud-pubsub,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let pubsubTopic of iterate(template.topics)){
      set("pubsubTopic", pubsubTopic)
      code(3)
    }
  }

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 pubsub topics list --project $projectId --format="json(name)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud pubsub topics describe $pubsubTopic --format="json(kmsKeyName)"

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

    extractors:
      - type: dsl
        dsl:
          - '"Pub/Sub Topic " + pubsubTopic + " in project " + projectId + " is not encrypted with Customer-Managed Encryption Key (CMEK)"'
# digest: 4b0a00483046022100f2496beaf38e13932578c6da9f3f3374d0276e060879452a8b3c3a8ca2ef7821022100de6502bce0556b10d1d677c2aec29432b4793b79853ad0dd18ac4c682f7dc9c9:922c64590222798bb761d5b6d8e72950

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/pubsub/gcloud-pubsub-cmek-disabled.yaml"

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