No Customer-Managed Encryption Keys in Google Cloud Functions

ID: gcloud-func-cmek-not-used

Severity: high

Author: princechaddha

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

Description

Ensure that your Google Cloud functions use Customer-Managed Encryption Keys (CMEK) instead of Google-managed encryption keys to encrypt data at rest. CMEKs provide greater control over the encryption and decryption process, enabling you to meet stringent compliance requirements.

YAML Source

id: gcloud-func-cmek-not-used

info:
  name: No Customer-Managed Encryption Keys in Google Cloud Functions
  author: princechaddha
  severity: high
  description: |
    Ensure that your Google Cloud functions use Customer-Managed Encryption Keys (CMEK) instead of Google-managed encryption keys to encrypt data at rest. CMEKs provide greater control over the encryption and decryption process, enabling you to meet stringent compliance requirements.
  impact: |
    Using Google-managed encryption keys instead of CMEKs reduces your ability to control the encryption process and comply with certain regulatory standards.
  remediation: |
    Configure your Google Cloud functions to use Customer-Managed Encryption Keys (CMEK) to ensure data encryption at rest is managed according to your compliance and security requirements.
  reference:
    - https://cloud.google.com/functions/docs/securing/managing-encryption-keys
  tags: cloud,devops,gcp,gcloud,google-cloud-functions,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let functionName of iterate(template.functions)){
      set("functionName", functionName)
      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 functions list --project $projectId --format="json(name)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud functions describe $functionName --format="json(kmsKeyName)"

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

    extractors:
      - type: dsl
        dsl:
          - '"Function not using CMEK: " + functionName + " in " + projectId + " project"'
# digest: 4a0a00473045022036beb2fd770344d590d37a8790e66f07d95b0f780fcca88dd87eb122dc5113f5022100ad2e88670bf9c93de176a2c68bc25d3c01a749aa3236f6736614fbf6b46de3a9:922c64590222798bb761d5b6d8e72950

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/function/gcloud-func-cmek-not-used.yaml"

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