VM Instance Preemptibility Not Disabled

ID: gcloud-vm-preemptible-enabled

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,compute,reliability,preemptible,gcp-cloud-config

Description

Ensure that your Google Cloud Platform (GCP) projects are not using preemptible virtual machine instances for production and business-critical applications. A preemptible virtual machine (VM) is an instance that you can create and run at a much lower price than normal instances but it can be terminated sooner due to system demands.

YAML Source

id: gcloud-vm-preemptible-enabled

info:
  name: VM Instance Preemptibility Not Disabled
  author: princechaddha
  severity: high
  description: |
    Ensure that your Google Cloud Platform (GCP) projects are not using preemptible virtual machine instances for production and business-critical applications. A preemptible virtual machine (VM) is an instance that you can create and run at a much lower price than normal instances but it can be terminated sooner due to system demands.
  impact: |
    Preemptible VM instances can be terminated at any time to free up resources for standard VM instances, making them unsuitable for production workloads and potentially causing service disruptions.
  remediation: |
    Re-create your VM instances with preemptibility disabled. Note that you cannot disable preemptibility on an existing instance - you must create a new instance without the preemptible option.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ComputeEngine/disable-preemptibility.html
    - https://cloud.google.com/compute/docs/instances/preemptible
  tags: cloud,devops,gcp,gcloud,compute,reliability,preemptible,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let instance of iterate(template.instances)){
      instance = JSON.parse(instance)
      set("instanceName", instance.name)
      set("zone", instance.zone)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

    extractors:
      - type: json
        name: projectIds
        internal: true
        json:
          - '.[].projectId'

  - engine:
      - sh
      - bash
    source: |
      gcloud compute instances list --project $projectId --format="json(name,zone.basename())"

    extractors:
      - type: json
        name: instances
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      gcloud compute instances describe $instanceName --zone $zone --project $projectId --format="json(scheduling.preemptible)"

    matchers:
      - type: word
        words:
          - "true"

    extractors:
      - type: dsl
        dsl:
          - '"VM instance " + instanceName + " in zone " + zone + " of project " + projectId + " is configured as preemptible and may not be suitable for production workloads"'
# digest: 4b0a00483046022100c0513a93a39675e710105757b88a285b42cea4b10d0de21abba6615d3f335d1f022100c1672d6cacacd58532d77684125237e31f787befb25d5fa7d0d1d77a4cb7339d:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/gcp/compute/gcloud-vm-preemptible-enabled.yaml"

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