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  3. Subdomain Takeover via Dangling CNAME
MediumVDP30 min

Subdomain Takeover via Dangling CNAME

By @gorka

Portal del gobierno ficticio con un subdominio legacy que apunta a un repositorio de GitHub Pages inexistente. El atacante debe descubrir el subdominio, identificar el CNAME dangling, reclamar el repositorio y tomar control del subdominio

263 views13 completedUpdated Aug 2026
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Hunters who solved it· 8

kaneki1
@kaneki10 days ago
flyingwhales2
@flyingwhales12 days ago
r4mattra3
@r4mattra12 days ago
AL
@alndrwla22 days ago
AL
@alex.burja.200029 days ago
gorka
@gorkaJun 2026
pl4nkton
@pl4nktonJun 2026
VI
@victorgg1993May 2026

Objectives

1
Reconocimiento → explorar la web del gobierno
2
Inspeccionar código fuente → descubrir subdominio en footer/robots.txt
3
Añadir portal.gobierno.gob.local al /etc/hosts
4
Visitar subdominio → GitHub Pages 404
5
Identificar el CNAME target (hash.github.io)
6
Crear el repositorio en GitHub (o usar /api/claim para simulación)
7
Subir contenido → subdominio tomado
8
Flag: d41d8cd98f00b204e9800998ecf8427e

Information

Platform
YesWeHack
Difficulty
Medium
Duration
30 min
Bounty
VDP
Completed
13
Creator
gorka@gorka
Updated
Aug 2026

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Tools

NavegadorGitHubTerminal

Prerequisites

  • Conocimineto Básico Sobre DNS
  • Cuenta de GitHub
  • Modificar Hosts del Sistema

Tags

Business Logic

Achievement you'll earn

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BBLABS.ESLab Solved
MediumVDP
// achievement_unlocked

Subdomain Takeover via Dangling CNAME

Business Logic
Aug 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real bug bounty practice

Community writeups

Setup

Añadir al /etc/hosts:

127.0.0.1 gobierno.gob.local
127.0.0.1 portal.gobierno.gob.local

Desplegar:

./autodeploy.sh
# o: docker compose up --build

Acceder: http://gobierno.gob.local:1000

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