Cloud Storage is anonymous or publicly accessible

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Metadata

Id: terraform-gcp-cloud-storage-anonymous-or-publicly-accessible

Provider: GCP

Platform: Terraform

Severity: Critical

Category: Access Control

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Description

Cloud Storage Buckets configured with anonymous or public access pose significant security risks by allowing anyone on the internet to access potentially sensitive data. Including allUsers in IAM bindings grants access to anyone, while allAuthenticatedUsers grants access to any Google account holder. Both violate the principle of least privilege.

Insecure configuration example:

resource "google_storage_bucket_iam_binding" "insecure" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:jane@example.com", "allUsers"]
}

Secure configuration example:

resource "google_storage_bucket_iam_binding" "secure" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:jane@example.com"]
}

Compliant Code Examples

#this code is a correct code for which the query should not find any result
resource "google_storage_bucket_iam_binding" "negative1" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = [
    "user:jane@example.com",
  ]
}

Non-Compliant Code Examples

#this is a problematic code where the query should report a result(s)
resource "google_storage_bucket_iam_binding" "positive1" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = []
}

resource "google_storage_bucket_iam_binding" "positive2" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:jane@example.com","allUsers"]
}

resource "google_storage_bucket_iam_binding" "positive3" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:jane@example.com", "allAuthenticatedUsers"]
}