gcloud-gke-vulnerability-scanning-disabled: GKE Clusters Without Workload Vulnerability Scanning

id: gcloud-gke-vulnerability-scanning-disabled

info:
  name: GKE Clusters Without Workload Vulnerability Scanning
  author: princechaddha
  severity: medium
  description: |
    Ensure that workload vulnerability scanning is enabled for your Google Kubernetes Engine (GKE) clusters to help detect vulnerabilities in container images, ensure compliance with security standards, and protect your clusters from potential threats. When enabled, a vulnerability scanning pod is deployed to each node within your GKE cluster to conduct the scan.
  impact: |
    Without workload vulnerability scanning enabled, vulnerabilities in container images and language packages may go undetected, increasing the risk of security breaches and exploitation of known vulnerabilities.
  remediation: |
    Enable workload vulnerability scanning for your GKE clusters using:
    gcloud container clusters update CLUSTER_NAME --region=REGION --workload-vulnerability-scanning=enterprise
  reference:
    - https://cloud.google.com/kubernetes-engine/docs/how-to/security-posture
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/GKE/enable-workload-vulnerability-scanning.html
  tags: cloud,devops,gcp,gcloud,gke,kubernetes,security,vulnerability,scanning,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let cluster of iterate(template.clusters)){
      cluster = JSON.parse(cluster)
      set("clusterName", cluster.name)
      set("location", cluster.location)
      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 container clusters list --project $projectId --format="json(name,location)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud container clusters describe $clusterName --location $location --project $projectId --format="value(securityPostureConfig.vulnerabilityMode)"

    matchers:
      - type: word
        words:
          - "VULNERABILITY_MODE_UNSPECIFIED"
          - "VULNERABILITY_DISABLED"
        condition: or

    extractors:
      - type: dsl
        dsl:
          - '"GKE cluster " + clusterName + " in " + location + " of project " + projectId + " does not have workload vulnerability scanning enabled"'
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