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  3. SSRF with Corporate Token Exfiltration
EasyVDP25 min

SSRF with Corporate Token Exfiltration

By @gorka

Plataforma de archivos con herramienta de preview de websites que realiza peticiones server-side con un token corporativo en los headers, permitiendo acceder a servicios internos protegidos

881 views72 completedUpdated Sep 2026
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Hackers who solved it· 8

bizedtv1
@bizedtv5 days ago
r00thor2
@r00thor7 days ago
kaneki3
@kaneki17 days ago
l1ghtn1ng
@l1ghtn1ng22 days ago
<d4r1c4r0>
@<d4r1c4r0>22 days ago
CR
@crash22 days ago
elc0ket
@elc0ket25 days ago
mateoalahuacbam
@mateoalahuacbam28 days ago

Objectives

1
Usar la herramienta de Website Preview
2
Descubrir que el servidor hace peticiones con un token corporativo
3
Apuntar el preview a http://localhost:1101 (CorpVault interno)
4
Obtener las credenciales protegidas del vault

Information

Difficulty
Easy
Duration
25 min
Bounty
VDP
Completed
72
Creator
gorka@gorka
Updated
Sep 2026

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Tools

NavegadorBurp Suite

Prerequisites

  • Concepto de SSRF
  • Servicios internos y puertos

Tags

SSRF

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

SSRF with Corporate Token Exfiltration

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

Community writeups

Credenciales

Usuario Contrasena Rol
alice password123 user

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
http://localhost:1100

Compatible con macOS, Linux y Windows (Docker Desktop / WSL).

Para parar:

./autodeploy.sh destroy
# o: docker compose down -v

Contenido del Lab

La aplicacion

FileForge es una plataforma de gestion de archivos con funcionalidad de preview de websites que realiza fetch server-side.

La vulnerabilidad

El Website Preview tool hace fetch(url) desde el servidor, adjuntando automaticamente un header X-Corporate-Token. El servicio CorpVault en el puerto 1101 (solo accesible internamente) devuelve credenciales si recibe el token correcto.

Cadena de ataque

1. Usar Website Preview con URL normal
2. Cambiar URL a http://localhost:1101
3. El servidor hace fetch con X-Corporate-Token
4. CorpVault devuelve credenciales
5. Flag en las credenciales exfiltradas

Solucion interactiva

Accede a /writeup dentro de la aplicacion para una guia paso a paso con botones interactivos.

Remediacion

  1. Whitelist de URLs/dominios permitidos para preview
  2. No enviar tokens/headers internos en peticiones a URLs de usuario
  3. Bloquear acceso a localhost y rangos privados (127.0.0.0/8, 10.0.0.0/8)
  4. Usar proxy dedicado sin credenciales para peticiones externas

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