Metadata

Id: terraform-gcp-google-project-iam-member-service-account-has-token-creator-or-account-user-role

Provider: GCP

Platform: Terraform

Severity: High

Category: Access Control

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• Provider Reference

Description

This check verifies that Google Project IAM Member service accounts are not assigned the Token Creator (iam.serviceAccountTokenCreator) or Account User (iam.serviceAccountUser) roles. These privileged roles allow the members to impersonate service accounts by creating tokens or using the service account identity to access resources, which could lead to privilege escalation if compromised. The recommended approach is to use more restrictive roles that provide only the necessary permissions required for the specific workload, as shown in the secure example below where a standard editor role is used instead of these high-risk roles:

resource "google_project_iam_member" "secure_example" {
  project = "your-project-id"
  role    = "roles/editor"
  member  = "user:jane@example.com"
}

Compliant Code Examples

resource "google_project_iam_member" "negative1" {
  project = "your-project-id"
  role    = "roles/editor"
  members  = "user:jane@example.com"
}

Non-Compliant Code Examples

resource "google_project_iam_member" "positive1" {
  project = "your-project-id"
  role    = "roles/iam.serviceAccountTokenCreator"
  member  = "serviceAccount:my-other-app@appspot.gserviceacccount.com"
}

resource "google_project_iam_member" "positive2" {
  project = "your-project-id"
  role    = "roles/iam.serviceAccountUser"
  members  = ["user:jane@example.com", "serviceAccount:my-other-app@appspot.gserviceacccount.com"]
}