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  3. Path Traversal via Invoice Download
MediumVDP30 min

Path Traversal via Invoice Download

By @gorka

Foro con sistema de pedidos donde el parametro file del endpoint de descarga de facturas permite path traversal para leer archivos arbitrarios del servidor.

184 views12 completedUpdated Aug 2026
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Hunters who solved it· 7

flyingwhales1
@flyingwhales12 days ago
r4mattra2
@r4mattra12 days ago
AL3
@alex.burja.200029 days ago
w4tchw0lf
@w4tchw0lfJun 2026
pl4nkton
@pl4nktonJun 2026
JO
@joako233May 2026
pmartinezr
@pmartinezrApr 2026

Objectives

1
Encontrar el endpoint de descarga de facturas
2
Identificar el parametro ?file= en la URL
3
Manipular el valor con ../../../etc/passwd
4
Leer archivos del sistema

Information

Difficulty
Medium
Duration
30 min
Bounty
VDP
Completed
12
Creator
gorka@gorka
Updated
Aug 2026

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Tools

Burp SuiteNavegador

Prerequisites

  • Path traversal basico
  • Manipulacion de parametros de URL

Tags

Path Traversal

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BBLABS.ESLab Solved
MediumVDP
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Path Traversal via Invoice Download

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

Community writeups

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
http://localhost:1400

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

Para parar:

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

Contenido del Lab

La aplicacion

ZeroDay Forum con sistema de pedidos y descarga de facturas.

La vulnerabilidad

El endpoint /api/orders/download?file=invoice.pdf no sanitiza el parametro file, permitiendo ?file=../../../../etc/passwd para leer archivos arbitrarios.

Cadena de ataque

1. Hacer un pedido y descargar factura
2. Observar URL: /api/orders/download?file=invoice_123.pdf
3. Cambiar a: ?file=../../../../etc/passwd
4. Obtener contenido del archivo del sistema

Solucion interactiva

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


Flag

(contenido de /etc/passwd o archivos del servidor)

Remediacion

  1. Usar path.basename() para sanitizar el nombre de archivo
  2. Verificar que la ruta final esta dentro del directorio de facturas
  3. Usar IDs de base de datos en vez de nombres de archivo
  4. Bloquear secuencias ../ en los parametros

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