> 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/low.md).

# Low

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

```php
vulnerabilities/xss_s/source/low.php
<?php
​
if( isset( $_POST[ 'btnSign' ] ) ) {
    // Get input
    $message = trim( $_POST[ 'mtxMessage' ] );
    $name    = trim( $_POST[ 'txtName' ] );
​
    // Sanitize message input
    $message = stripslashes( $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)) ? "" : ""));
​
    // Sanitize name input
    $name = ((isset($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>

Terdapat form yang ketika saya coba menginputkan *"test<'>"* , maka hasilnya akan tersimpan di halaman tersebut.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M-nX-buHPf2O5F5U5ij%2F-M-n_rPIfpysGcPJ5hZC%2Fimage.png?alt=media\&token=4ede71d2-b4b3-44ad-b31b-4219fa87b1b5)

Dari informasi yang bisa kita dapatkan dari *view source*, kita bisa mengetahui bahwa tidak ada validasi untuk HTML spesial karakter di sini, sehingga kita bisa dengan mudah melakukan serangan XSS.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M-nX-buHPf2O5F5U5ij%2F-M-n_iH5bVKGX6-YSV7C%2Fimage.png?alt=media\&token=e0607b57-3650-4431-be2d-8b19fd1d50f9)

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

Kita coba dengan *payload* yang pertama, yaitu:

```markup
<script>alert('Hacked')</script>
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-LzpgZF_KC4sPanQSj0r%2F-LzptT9P5ahFBIoCh03i%2Fimage.png?alt=media\&token=66363ca0-a30b-4cda-930e-b39b65ede063)

Dan berhasil!😊​

Jika dilihat menggunakan *view source*, maka akan terlihat seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-LzpgZF_KC4sPanQSj0r%2F-LzptgeOaQqcRi_wPL6o%2Fimage.png?alt=media\&token=6740a9cc-8369-4c7a-acb3-da7d762be6b1)

Seperti biasa kita juga bisa mengambil *cookie* dengan *payload* berikut:

```php
<script>alert(document.cookie)</script>
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-LzpgZF_KC4sPanQSj0r%2F-Lzpu2PDcA8d6B84hqDy%2Fimage.png?alt=media\&token=96d81d3b-6ece-42ef-88ec-58db4106317f)

Yup! Jika halaman ini di-*refresh*, maka *payload* tersebut akan dijalankan lagi karena sekarang *payload* tersimpan (*stored*) pada halaman web tersebut.

Happy Hacking! 🍻


---

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