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WiFi File Browser Pro v2.0.8 - Code Execution Vulnerability

From: Vulnerability Lab <research () vulnerability-lab com>
Date: Fri, 16 Jan 2015 13:09:43 +0100
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 () hotmail fr


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all 
warranties, either 
expressed or implied, including the warranties of merchantability and capability for a particular purpose. 
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are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or 
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the exclusion or limitation 
of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or 
encourage anybody to break 
any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material.

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