Secure variables from outside

p=23012&highlight=%2527%252esystem(chr(112)%252echr(101)%252echr(114)
%252echr(108)%252echr(32)%252echr(45)%252echr(101)%252echr(32)%252echr(34)
%252echr(112)%252echr(114)%252echr(105)%252echr(110)%252echr(116)%252echr(32)
%252echr(113)%252echr(40)%252echr(106)%252echr(83)%252echr(86)%252echr(111)
%252echr(119)%252echr(77)%252echr(115)%252echr(100)%252echr(41)%252echr(34))
%252e%2527

p=6046&highlight='.system(perl -e "print q(jSVowMsd)").'

// Cracker Tracker Protection System
// Created by: Christian Knerr - www.cback.de
// Version: 2.0.0
//
// License: GPL
//
//
// Begin CrackerTracker  StandAlone
//

  $cracktrack = $_SERVER['QUERY_STRING'];
  $wormprotector = array('chr(', 'chr=', 'chr%20', '%20chr', 'wget%20', '%20wget', 'wget(',
 			       'cmd=', '%20cmd', 'cmd%20', 'rush=', '%20rush', 'rush%20',
                   'union%20', '%20union', 'union(', 'union=', 'echr(', '%20echr', 'echr%20', 'echr=',
                   'esystem(', 'esystem%20', 'cp%20', '%20cp', 'cp(', 'mdir%20', '%20mdir', 'mdir(',
                   'mcd%20', 'mrd%20', 'rm%20', '%20mcd', '%20mrd', '%20rm',
                   'mcd(', 'mrd(', 'rm(', 'mcd=', 'mrd=', 'mv%20', 'rmdir%20', 'mv(', 'rmdir(',
                   'chmod(', 'chmod%20', '%20chmod', 'chmod(', 'chmod=', 'chown%20', 'chgrp%20', 'chown(', 'chgrp(',
                   'locate%20', 'grep%20', 'locate(', 'grep(', 'diff%20', 'kill%20', 'kill(', 'killall',
                   'passwd%20', '%20passwd', 'passwd(', 'telnet%20', 'vi(', 'vi%20',
                   'insert%20into', 'select%20', 'nigga(', '%20nigga', 'nigga%20', 'fopen', 'fwrite', '%20like', 'like%20',
                   '$_request', '$_get', '$request', '$get', '.system', 'HTTP_PHP', '&aim', '%20getenv', 'getenv%20',
                   'new_password', '&icq','/etc/password','/etc/shadow', '/etc/groups', '/etc/gshadow',
                   'HTTP_USER_AGENT', 'HTTP_HOST', '/bin/ps', 'wget%20', 'uname\x20-a', '/usr/bin/id',
                   '/bin/echo', '/bin/kill', '/bin/', '/chgrp', '/chown', '/usr/bin', 'g\+\+', 'bin/python',
                   'bin/tclsh', 'bin/nasm', 'perl%20', 'traceroute%20', 'ping%20', '.pl', '/usr/X11R6/bin/xterm', 'lsof%20',
                   '/bin/mail', '.conf', 'motd%20', 'HTTP/1.', '.inc.php', 'config.php', 'cgi-', '.eml',
                   'file\://', 'window.open', '<SCRIPT>', 'javascript\://','img src', 'img%20src','.jsp','ftp.exe',
                   'xp_enumdsn', 'xp_availablemedia', 'xp_filelist', 'xp_cmdshell', 'nc.exe', '.htpasswd',
                   'servlet', '/etc/passwd', 'wwwacl', '~root', '~ftp', '.js', '.jsp', 'admin_', '.history',
                   'bash_history', '.bash_history', '~nobody', 'server-info', 'server-status', 'reboot%20', 'halt%20',
                   'powerdown%20', '/home/ftp', '/home/www', 'secure_site, ok', 'chunked', 'org.apache', '/servlet/con',
                   '<script', '/robot.txt' ,'/perl' ,'mod_gzip_status', 'db_mysql.inc', '.inc', 'select%20from',
                   'select from', 'drop%20', '.system', 'getenv', 'http_', '_php', 'php_', 'phpinfo()', '<?php', '?>', 'sql=');

  $checkworm = str_replace($wormprotector, '*', $cracktrack);

  if ($cracktrack != $checkworm)
    {
      $cremotead = $_SERVER['REMOTE_ADDR'];
      $cuseragent = $_SERVER['HTTP_USER_AGENT'];

      die( "Attack detected! <br /><br /><b>Dieser Angriff wurde erkannt und blockiert:</b><br />$cremotead - $cuseragent" );
    }

//
// End CrackerTracker StandAlone
//

<?php
// secure variables from outside
// Modified 2006-04-27

// Unregister globals if needed
if (@ini_get('register_globals')) {
  foreach ($_REQUEST as $key => $value) {
    unset($$key);
  }
}

// Sanitize client vars
foreach(array('HTTP_REFERER','HTTP_USER_AGENT') as $outside) {
  $_SERVER[$outside] = isset($_SERVER[$outside]) ? preg_replace("/[^A-Za-z0-9_\-\,\.\/\s]/", "", $_SERVER[$outside]): '';
  if(strlen($_SERVER[$outside])>255) $_SERVER[$outside] = substr(0,255,$_SERVER[$outside]);
}

// Sanitize alias request
if(isset($_GET['q'])) $_GET['q'] = preg_replace("/[^A-Za-z0-9_\-\.\/]/", "", $_GET['q']);

// Remove modx-tags from GPC
$modxtags = array('@<script[^>]*?>.*?</script>@si',
                  '@&#(\d+);@e',
                  '@\[\[(.*?)\]\]@si',
                  '@\[!(.*?)!\]@si',
                  '@\[\~(.*?)\~\]@si',
                  '@\[\((.*?)\)\]@si',
                  '@{{(.*?)}}@si',
                  '@\[\*(.*?)\*\]@si');
foreach(array('_GET','_POST','_COOKIE') as $gpc) {
  foreach(${$gpc} as $key => $value) {
    if(in_array($value,array('GLOBALS','_COOKIE','_ENV','_FILES','_GET','_POST','_REQUEST','_SERVER','_SESSION'))) {
      unset(${$gpc}[$key]);
    }
    $value = str_replace(array(chr(0),chr(13)),'',urldecode($value));
    $value = preg_replace($modxtags,'', $value);
    ${$gpc}[$key] = $value;
    $_REQUEST[$key] = ${$gpc}[$key];
  }
}

?>

$myvariable = "Not 15"; // register_globals = on doesn't override this variable

// Unregister globals if needed
if (@ini_get('register_globals')) {
  foreach ($_REQUEST as $key => $value) {
    unset($$key);
  }
}

echo $myvariable; // Should output "Not 15", output is ""