GKE Clusters Without Inter-Node Transparent Encryption

ID: gcloud-gke-transparent-encryption-disabled

Severity: high

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,gke,kubernetes,security,encryption,gcp-cloud-config

Description

Ensure that encryption of in-transit data for Pod communications across Google Kubernetes Engine (GKE) cluster nodes is enabled with Customer-Managed Encryption Keys (CMEKs). This feature, which requires GKE Dataplane V2, provides additional encryption on top of the default VM NIC-level encryption using WireGuard.

YAML Source

id: gcloud-gke-transparent-encryption-disabled

info:
  name: GKE Clusters Without Inter-Node Transparent Encryption
  author: princechaddha
  severity: high
  description: |
    Ensure that encryption of in-transit data for Pod communications across Google Kubernetes Engine (GKE) cluster nodes is enabled with Customer-Managed Encryption Keys (CMEKs). This feature, which requires GKE Dataplane V2, provides additional encryption on top of the default VM NIC-level encryption using WireGuard.
  impact: |
    Without inter-node transparent encryption enabled, pod-to-pod traffic across nodes relies solely on default VM NIC-level encryption, potentially not meeting regulatory requirements for industries that need direct control over encryption keys.
  remediation: |
    Enable inter-node transparent encryption for your GKE clusters using:
    gcloud container clusters update CLUSTER_NAME --region=REGION --in-transit-encryption inter-node-transparent
  reference:
    - https://cloud.google.com/kubernetes-engine/docs/how-to/encrypt-in-transit
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/GKE/enable-inter-node-transparent-encryption.html
  tags: cloud,devops,gcp,gcloud,gke,kubernetes,security,encryption,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(networkConfig.inTransitEncryptionConfig)"

    matchers:
      - type: word
        words:
          - "IN_TRANSIT_ENCRYPTION_DISABLED"

    extractors:
      - type: dsl
        dsl:
          - '"GKE cluster " + clusterName + " in " + location + " of project " + projectId + " does not have inter-node transparent encryption enabled"'
# digest: 4a0a00473045022037f5b9a1e34669bb84b2f33ea9e66f6b42ca285fd5aec7174ec92c92a67c84ff022100c63d608fe49f7085008a749eb81f4d6e86cdf90442d6da23bda82a6bd47012a5:922c64590222798bb761d5b6d8e72950

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/gke/gcloud-gke-transparent-encryption-disabled.yaml"

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