Use VPC Service Controls for Cloud Storage Buckets

ID: gcloud-vpc-service-controls-not-configured

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-storage,vpc-service-controls,security,gcp-cloud-config

Description

Ensure that VPC Service Controls are used to configure a security perimeter around your Google Cloud Storage buckets to prevent data exfiltration and enhance the security posture of your cloud environment.

YAML Source

id: gcloud-vpc-service-controls-not-configured

info:
  name: Use VPC Service Controls for Cloud Storage Buckets
  author: princechaddha
  severity: medium
  description: |
    Ensure that VPC Service Controls are used to configure a security perimeter around your Google Cloud Storage buckets to prevent data exfiltration and enhance the security posture of your cloud environment.
  impact: |
    Without VPC Service Controls, sensitive data in your Google Cloud Storage buckets is at a higher risk of unauthorized access and exfiltration.
  remediation: |
    Configure VPC Service Controls with a security perimeter that includes the Cloud Storage service (storage.googleapis.com) to protect your sensitive data.
  reference:
    - https://cloud.google.com/vpc-service-controls/docs/overview
  tags: cloud,devops,gcp,gcloud,google-cloud-storage,vpc-service-controls,security,gcp-cloud-config

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

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

  - engine:
      - sh
      - bash
    source: |
      gcloud access-context-manager perimeters describe $perimeterName --project $projectId --format=json | jq -r '.status.restrictedServices[]? // "null"'

    matchers:
      - type: word
        words:
          - 'storage.googleapis.com'

    extractors:
      - type: dsl
        dsl:
          - '"The VPC Service Perimeter " + perimeterName + " in project " + projectId + " does not include storage.googleapis.com, leaving Cloud Storage buckets unprotected."'
# digest: 4a0a00473045022100e0c749fa7ab8e6de075a46c7c41aa9d595a2bf0a68d1ad89f7d99659a1e37d480220163aa5c74cf3a4753b51fe9968e4aa61102a960789c49d80cf5f34bfa0e9a229:922c64590222798bb761d5b6d8e72950

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-vpc-service-controls-not-configured.yaml"

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