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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

516 views59 completedUpdated Aug 2026
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Hunters who solved it· 8

cyzk01
@cyzk04 days ago
danielmijan112
@danielmijan115 days ago
itrox3
@itrox5 days ago
HO
@horseman5 days ago
VA
@vazquezdv1820057 days ago
retryx00
@retryx007 days ago
rodegarrido1
@rodegarrido18 days ago
zynap
@zynap14 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
59
Creator
gorka@gorka
Updated
Aug 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
Aug 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real bug bounty 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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