Cloud CDN SSL/TLS Not Enforced

ID: gcloud-cdn-ssl-enforcement

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,cloud-cdn,gcp-cloud-config

Description

Ensure that Google Cloud CDN backend bucket origins enforce HTTPS using SSL/TLS certificates in order to handle encrypted traffic. This helps to protect the integrity and confidentiality of the transmitted information.

YAML Source

id: gcloud-cdn-ssl-enforcement

info:
  name: Cloud CDN SSL/TLS Not Enforced
  author: princechaddha
  severity: medium
  description: |
    Ensure that Google Cloud CDN backend bucket origins enforce HTTPS using SSL/TLS certificates in order to handle encrypted traffic. This helps to protect the integrity and confidentiality of the transmitted information.
  impact: |
    Not enforcing HTTPS can expose data to interception or alteration during transmission, compromising data confidentiality and integrity.
  remediation: |
    Configure SSL/TLS certificates for Cloud CDN backend bucket origins and ensure all traffic is served over HTTPS by adjusting the forwarding rules and url-maps.
  reference:
    - https://cloud.google.com/cdn/docs/using-https
  tags: cloud,devops,gcp,gcloud,cloud-cdn,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let urlMap of iterate(template.urlMaps)){
      set("urlMapName", urlMap.name)
      set("defaultService", urlMap.defaultService)
      code(3)
      for(let forwardingRule of iterate(template.forwardingRules)){
        set("forwardingRuleName", forwardingRule)
        code(4)
      }
    }
  }

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 url-maps list --project $projectId --format="json(name,defaultService)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud compute forwarding-rules list --project $projectId --format="json(name)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud compute forwarding-rules describe $forwardingRuleName --project $projectId --global --format="value(portRange)"

    matchers:
      - type: word
        words:
          - '80-80'

    extractors:
      - type: dsl
        dsl:
          - '"SSL/TLS not enforced on Cloud CDN backend bucket origin: " + defaultService + " via URL map: " + urlMapName + " in Project: " + projectId'
# digest: 4a0a0047304502200ba02ce144420070756cbf207f65eed69dce4d8fa833b734d7062c42174dca2f022100faca1ece34716d82c0c693eb741dc4c9589c8d88697c9ac5ca29b8f08c0d090a: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/cdn/gcloud-cdn-ssl-enforcement.yaml"

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