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IP forwarding is enabled on the instance Affecting Compute Engine service in Google

Severity

0.0
medium
0
10
    Severity Framework
    Snyk CCSS
    Rule category
    Network / Policy

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    Frameworks
    CIS-Google CSA-CCM ISO-27001 NIST-800-53
  • Snyk ID SNYK-CC-00378
  • credit Snyk Research Team
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Description

By default, a Compute Engine instance cannot forward a packet originated by another instance ("IP forwarding"). If this is enabled, Google Cloud no longer enforces packet source and destination checking, which can result in data loss or unintended information disclosure.

How to fix?

Set the google_compute_instance can_ip_forward attribute to false.

Example Configuration

resource "google_compute_instance" "test" {
  name         = "enabled-ip-forwarding"
  machine_type = "e2-micro"
  zone         = "us-east1-b"
  can_ip_forward = false

  boot_disk {
    initialize_params {
      image = "debian-10-buster-v20220920"
    }
  }

  network_interface {
    network = "default"
  }
}