> 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/stored/high.md).

# High

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

```php
vulnerabilities/xss_s/source/high.php
<?php
​
if( isset( $_POST[ 'btnSign' ] ) ) {
    // Get input
    $message = trim( $_POST[ 'mtxMessage' ] );
    $name    = trim( $_POST[ 'txtName' ] );
​
    // Sanitize message input
    $message = strip_tags( addslashes( $message ) );
    $message = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $message ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));
    $message = htmlspecialchars( $message );
​
    // Sanitize name input
    $name = preg_replace( '/<(.*)s(.*)c(.*)r(.*)i(.*)p(.*)t/i', '', $name );
    $name = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $name ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));
​
    // Update database
    $query  = "INSERT INTO guestbook ( comment, name ) VALUES ( '$message', '$name' );";
    $result = mysqli_query($GLOBALS["___mysqli_ston"],  $query ) or die( '<pre>' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)) . '</pre>' );
​
    //mysql_close();
}
​
?> 
```

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

Pada *source code* di atas terlihat bahwa *pattern* **"\<s\*c\*r\*i\*p\*t"** tidak diizinkan pada form **Name**. Tetapi, pada level medium pun kita tidak menggunakannya, sehingga kita bisa menggunakan cara seperti sebelumnya.

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

Kita akan coba seperti pada level sebelumnya, yaitu dengan membuat form **Name** bisa diisi banyak karakter, lalu diinputkan dengan *payload* yang sama.

```markup
<body onload="alert(document.cookie)">
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-LzpgZF_KC4sPanQSj0r%2F-Lzqof55NrkqqbXjmywW%2Fimage.png?alt=media\&token=15a8eab5-3527-439e-9828-2a5a56d1b439)

Mudah bukan? Kita harus teliti dan sering mencoba.

**Alhamdulillah!** Materi Stored XSS akhirnya selesai juga kita pelajari. Tetap semangat dan lanjut ke materi selanjutnya! 🔥


---

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