Enforce Public Access Prevention for Cloud Storage Buckets

ID: gcloud-public-access-prevention-not-enabled

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-storage,security,public-access-prevention,gcp-cloud-config

Description

Ensure that the Public Access Prevention feature is enabled for your Google Cloud Storage buckets to restrict public access and protect sensitive data from accidental or malicious exposure.

YAML Source

id: gcloud-public-access-prevention-not-enabled

info:
  name: Enforce Public Access Prevention for Cloud Storage Buckets
  author: princechaddha
  severity: high
  description: |
    Ensure that the Public Access Prevention feature is enabled for your Google Cloud Storage buckets to restrict public access and protect sensitive data from accidental or malicious exposure.
  impact: |
    Without Public Access Prevention, sensitive data stored in your Cloud Storage buckets may be publicly accessible, leading to potential data breaches.
  remediation: |
    Enable the Public Access Prevention feature for your Cloud Storage buckets to restrict public access and secure your data.
  reference:
    - https://cloud.google.com/storage/docs/public-access-prevention
  tags: cloud,devops,gcp,gcloud,google-cloud-storage,security,public-access-prevention,gcp-cloud-config

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

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

  - engine:
      - sh
      - bash
    source: |
      gcloud storage buckets describe gs://$bucketName --format="json(public_access_prevention)" | jq -r '. // "null"'

    matchers:
      - type: word
        words:
          - 'inherited'

    extractors:
      - type: dsl
        dsl:
          - '"Public Access Prevention is not enabled for the bucket " + bucketName + " in project " + projectId'
# digest: 4a0a00473045022100c1b3ec23ade491f0feed95fabd9d6ddc0497ca798fc90e87e937354910e9fc79022061180eaadc90af9f7270297bfafaad491d57c30b6f5af1eee12f047e5e3c2885:922c64590222798bb761d5b6d8e72950

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/storage/gcloud-public-access-prevention-not-enabled.yaml"

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