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Nuclei Templates

CNAME Detect Dangling

ID: detect-dangling-cname

Severity: info

Author: pdteam,nytr0gen

Tags: dns,takeover

Description

Section titled “Description”

A CNAME detect dangling condition was discovered. Most commonly this relates to failing to remove records from the zone once they are no longer needed.

YAML Source

Section titled “YAML Source”
id: detect-dangling-cname


info:
  name: CNAME Detect Dangling
  author: pdteam,nytr0gen
  severity: info
  description: A CNAME detect dangling condition was discovered. Most commonly this relates to failing to remove records from the zone once they are no longer needed.
  reference:
    - https://securitytrails.com/blog/subdomain-takeover-tips
    - https://nominetcyber.com/dangling-dns-is-no-laughing-matter/
    - https://nabeelxy.medium.com/dangling-dns-records-are-a-real-vulnerability-361f2a29d37f
    - https://docs.microsoft.com/en-us/azure/security/fundamentals/subdomain-takeover
  classification:
    cwe-id: CWE-200
  metadata:
    max-request: 1
  tags: dns,takeover


dns:
  - name: "{{FQDN}}"
    type: A


    matchers-condition: and
    matchers:
      - type: word
        words:
          - "NXDOMAIN"


      - type: regex
        part: answer
        regex:
          - "IN\tCNAME\t(.+)$"


    extractors:
      - type: dsl
        dsl:
          - cname
# digest: 4a0a00473045022068970462c003171d31d9f5968e26d73eb7435bea738ae8753ec21bb6a7416028022100ac969c65486f52dcac005333256eeb722f1d1bad1ca642e5ebfb9166891dd1a1:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “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.

Terminal window
$ nuclei -u "URL" -t "dns/detect-dangling-cname.yaml"

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