Enable Uniform Bucket-Level Access for Cloud Storage Buckets

ID: gcloud-uniform-bucket-level-access-not-enabled

Severity: medium

Author: princechaddha

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

Description

Ensure that uniform bucket-level access is enabled for all your Google Cloud Storage buckets. This ensures that object access is controlled entirely through bucket-level IAM permissions, providing a consistent and secure way to manage access to bucket data.

YAML Source

id: gcloud-uniform-bucket-level-access-not-enabled

info:
  name: Enable Uniform Bucket-Level Access for Cloud Storage Buckets
  author: princechaddha
  severity: medium
  description: |
    Ensure that uniform bucket-level access is enabled for all your Google Cloud Storage buckets. This ensures that object access is controlled entirely through bucket-level IAM permissions, providing a consistent and secure way to manage access to bucket data.
  impact: |
    Without uniform bucket-level access, managing object-level permissions can lead to inconsistent and insecure access control configurations.
  remediation: |
    Enable uniform bucket-level access for your Google Cloud Storage buckets to manage permissions uniformly and improve security.
  reference:
    - https://cloud.google.com/storage/docs/uniform-bucket-level-access
  tags: cloud,devops,gcp,gcloud,google-cloud-storage,security,access-control,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: |
      gsutil ls -p $projectId | jq -R . | jq -s .

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

  - engine:
      - sh
      - bash
    source: |
      gsutil uniformbucketlevelaccess get $bucketName

    matchers:
      - type: word
        words:
          - 'Enabled: False'

    extractors:
      - type: dsl
        dsl:
          - '"Uniform bucket-level access is not enabled for the bucket " + bucketName + " in project " + projectId'
# digest: 4b0a00483046022100845f2d4f9de7940afaef8f698902d248f08564b4b022415ee008cbfb9826018d022100ccf10d8da665628c3b477b8d3279d590cde4f2dc0dcb6155c5c629ace7bdb05f: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-uniform-bucket-level-access-not-enabled.yaml"

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