DNSSEC RSASHA1 Algorithm Deprecated

ID: gcloud-dnssec-rsasha1-deprecated

Severity: medium

Author: princechaddha

Tags: cloud,devops,gcp,gcloud,dns,dnssec,gcp-cloud-config

Description

Ensure that Domain Name System Security Extensions (DNSSEC) feature is not using the deprecated RSASHA1 algorithm for the Zone-Signing Key (ZSK) associated with your public DNS managed zone.

YAML Source

id: gcloud-dnssec-rsasha1-deprecated

info:
  name: DNSSEC RSASHA1 Algorithm Deprecated
  author: princechaddha
  severity: medium
  description: |
    Ensure that Domain Name System Security Extensions (DNSSEC) feature is not using the deprecated RSASHA1 algorithm for the Zone-Signing Key (ZSK) associated with your public DNS managed zone.
  impact: |
    Using RSASHA1 as the zone-signing algorithm in DNSSEC can expose DNS data to increased risks of being compromised due to weaker cryptographic strength.
  remediation: |
    Update the DNSSEC configuration to use a stronger, more secure signing algorithm like RSASHA256 or ECDSAP256SHA256 for your DNS managed zones.
  reference:
    - https://cloud.google.com/dns/docs/dnssec-configuring
  tags: cloud,devops,gcp,gcloud,dns,dnssec,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let managedZone of iterate(template.managedZones)){
      set("managedZoneName", managedZone)
      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 dns managed-zones list --project $projectId --format="json(name,visibility)"

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

  - engine:
      - sh
      - bash
    source: |
      gcloud dns managed-zones describe $managedZoneName --project $projectId --format="json(dnssecConfig)"

    matchers:
      - type: word
        words:
          - 'rsasha1'
          - 'zoneSigning'
        condition: and

    extractors:
      - type: dsl
        dsl:
          - '"Deprecated RSASHA1 Algorithm used in DNSSEC for Managed Zone: " + managedZoneName + " in Project: " + projectId'
# digest: 4b0a00483046022100cb8b9fff2868480c6af2ad01eab469aae458e9d9bab3eff9a7e58b2bcf36d7c7022100d6a35be3a70ec1ae8d2e5abf280603f6b3c1a64e1e2fd5ae89bd0d281d4dda56:922c64590222798bb761d5b6d8e72950

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/dns/gcloud-dnssec-zonesigning-rsasha1.yaml"

View on Github