COS Node Image Not Used

• Query id: 8a893e46-e267-485a-8690-51f39951de58
• Query name: COS Node Image Not Used
• Platform: Terraform
• Severity: Medium
• Category: Insecure Configurations
• URL: Github

Description

The node image should be Container-Optimized OS(COS)
Documentation

Code samples

Code samples with security vulnerabilities

Postitive test num. 1 - tf file

resource "google_container_cluster" "positive1" {
  name     = "my-gke-cluster"
  location = "us-central1"
  remove_default_node_pool = true
  initial_node_count       = 1
}


resource "google_container_node_pool" "positive2" {
  project = "gcp_project"
  name    = "primary-pool"
  region  = "us-west1"
  cluster = google_container_cluster.primary.name

  node_config {
    image_type   = "WINDOWS_LTSC"
  }
 }

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "google_container_cluster" "negative1" {
  name     = "my-gke-cluster"
  location = "us-central1"
  remove_default_node_pool = true
  initial_node_count       = 1
}


resource "google_container_node_pool" "negative2" {
  project = "gcp_project"
  name    = "primary-pool"
  region  = "us-west1"
  cluster = google_container_cluster.primary.name

  node_config {
    image_type   = "COS"
  }
}

 resource "google_container_node_pool" "negative3" {
  project = "gcp_project"
  name    = "primary-pool2"
  region  = "us-west1"
  cluster = google_container_cluster.primary.name
 }

resource "google_container_node_pool" "negative4" {
  project = "gcp_project"
  name    = "primary-pool2"
  region  = "us-west1"
  cluster = google_container_cluster.primary.name

  node_config {
    image_type   = "COS_CONTAINERD"
  }
}