Enable Cloud DNS Logging for VPC Networks

ID: gcloud-dns-logging-not-enabled

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,google-cloud-dns,logging,security,gcp-cloud-config

Description

Ensure that Cloud DNS logging is enabled for all your Virtual Private Cloud (VPC) networks using DNS server policies. Cloud DNS logging records DNS queries resolved by name servers for VPC networks, as well as queries to public DNS zones from external entities.

YAML Source

id: gcloud-dns-logging-not-enabled

info:
  name: Enable Cloud DNS Logging for VPC Networks
  author: princechaddha
  severity: medium
  description: |
    Ensure that Cloud DNS logging is enabled for all your Virtual Private Cloud (VPC) networks using DNS server policies. Cloud DNS logging records DNS queries resolved by name servers for VPC networks, as well as queries to public DNS zones from external entities.
  impact: |
    Without Cloud DNS logging, you lose visibility into DNS queries, making it difficult to monitor, troubleshoot, and detect potential security threats or misconfigurations.
  remediation: |
    Enable Cloud DNS logging for your VPC networks to monitor and analyze DNS query activity for better security and compliance.
  reference:
    - https://cloud.google.com/dns/docs/policies
  tags: cloud,devops,gcp,gcloud,google-cloud-dns,logging,security,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let network of iterate(template.networks)){
      set("networkName", network)
      code(3)
      for(let dnsPolicy of iterate(template.dnsPolicies)){
        set("dnsPolicy", dnsPolicy.name)
        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 networks list --project $projectId --format="json(name)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud dns policies list --project $projectId --format="json(name)" --filter="networks[].networkUrl:$networkName"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud dns policies describe $dnsPolicy --project $projectId --format="json(enableLogging)" | jq -r '.enableLogging // "null"'

    matchers:
      - type: word
        words:
          - 'False'

    extractors:
      - type: dsl
        dsl:
          - '"Cloud DNS logging is not enabled for the DNS policy " + dnsPolicy + " in network " + networkName + " in project " + projectId'
# digest: 4b0a00483046022100c3a532bde5c201a4c56719019d3b6a0988fb37e5b7e2409fec6359d37995555c022100c1f5d182ca692caf2a8a60c90ce15687ef9c1bbe07492f7b86db2275da2dd351:922c64590222798bb761d5b6d8e72950

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/vpc/gcloud-dns-logging-not-enabled.yaml"

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