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Project-wide SSH keys are allowed Affecting Compute Engine service in Google

Severity

0.0
medium
0
10
    Severity Framework
    Snyk CCSS
    Rule category
    Keys and Secrets / Secure Login

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    Frameworks
    CIS-Controls CIS-Google HIPAA ISO-27001 NIST-800-53 PCI-DSS SOC-2
  • Snyk ID SNYK-CC-00379
  • credit Snyk Research Team
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Description

Project-wide SSH keys for Compute Engine instances may be easier to manage than instance-specific SSH keys, but if compromised, present increase security risk to all instances within a given project. Note that if OS Login is enabled, SSH keys in instance metadata are ignored, so blocking project-wide SSH keys is not necessary.

How to fix?

Set metadata.block-project-ssh-keys attribute to true.

Example Configuration

resource "google_compute_instance" "allowed" {
  name         = "test"
  machine_type = "e2-medium"
  zone         = "us-central1-a"

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-11"
    }
  }

  network_interface {
    network = "default"

  metadata = {
    block-project-ssh-keys = true
  }
}