terraform.gcp.security.gcp-project-default-network.gcp-project-default-network

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Ensure that the default network does not exist in a project. Set auto_create_network to false.

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Defintion

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rules:
  - id: gcp-project-default-network
    patterns:
      - pattern: resource
      - pattern-inside: |
          resource "google_project" "..." {
          ...
          }
      - pattern-not-inside: |
          resource "google_project" "..." {
          ...
          auto_create_network   = false
          ...
          }
    message: Ensure that the default network does not exist in a project. Set
      auto_create_network to `false`.
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - gcp
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization
    languages:
      - hcl
    severity: WARNING

Examples

gcp-project-default-network.tf

# fail
# ruleid: gcp-project-default-network
resource "google_project" "fail" {
    name       = "My Project"
    project_id = "your-project-id"
    org_id     = "1234567"
}

# ok: gcp-project-default-network
resource "google_project" "pass" {
    name       = "My Project"
    project_id = "your-project-id"
    org_id     = "1234567"
    auto_create_network   = false
}