> For the complete documentation index, see [llms.txt](https://notes.anggipradana.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://notes.anggipradana.com/tutorial/dvwa/cross-site-scripting-xss/dom/high.md).

# High

Di bawah ini adalah *source-code* dari XSS (DOM) level high di DVWA.

```php
vulnerabilities/xss_d/source/high.php
<?php
​
// Is there any input?
if ( array_key_exists( "default", $_GET ) && !is_null ($_GET[ 'default' ]) ) {
​
    # White list the allowable languages
    switch ($_GET['default']) {
        case "French":
        case "English":
        case "German":
        case "Spanish":
            # ok
            break;
        default:
            header ("location: ?default=English");
            exit;
    }
}
​
?> 
```

## Mencari Informasi <a href="#mencari-informasi" id="mencari-informasi"></a>

Pada level ini, developer sekarang menentukan *whitelist* untuk nilai dari parameter **default**.

Setelah mencoba berbagai cara, akhirnya saya mencoba untuk membuat parameter baru (di sini diberi nama **test**), dan hasilnya seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-Lzjw2vnbgz2EXMb1Jkv%2F-Lzjz_rYSa4d9-id-XXR%2Fimage.png?alt=media\&token=e326c3f3-d102-44e2-a7d4-31664e14e051)

Terlihat bahwa parameter baru tersebut akan ter-*print* ke halaman web tersebut. Ini bisa kita manfaatkan untuk melakukan *injection*.

## Melakukan Serangan <a href="#melakukan-serangan" id="melakukan-serangan"></a>

Hasil dari pengamatan di atas adalah kita bisa menyisipkan script seperti berikut:

```markup
?default=English&<script>alert("Hacked")</script>
```

Jika dijalankan akan tampil hasil *injection* seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-Lzjw2vnbgz2EXMb1Jkv%2F-Lzk-hqFbY88Nv1iTPen%2Fimage.png?alt=media\&token=1fedf275-5823-4fb6-aa84-31267f656689)

Seperti biasa, kita juga bisa mengambil *cookie*-nya.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-Lzjw2vnbgz2EXMb1Jkv%2F-Lzk-uu41EmkH38-BR5l%2Fimage.png?alt=media\&token=06f20f90-957e-4a6a-b0d7-683489a02dc9)

Selain menggunakan *payload* seperti di atas, saya juga menemukan cara baru dengan menggunakan *payload* berikut:

```markup
?default=English#<script>alert(123)</script>
```

**Alhamdulillah!** Kita telah menyelesaikan semua level dari XSS (DOM) di DVWA.😁​

Happy Hacking! 🍻


---

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