My.WiFi USB Drive v1.0 iOS - File Include Vulnerability

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

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


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


Release Date:
=============
2015-09-24


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


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


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 a local file include 
vulnerability in the official 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 local file include web vulnerability has been discovered in the official 
My.WiFi USB Drive v1.0 iOS mobile web-application.
The local file include web vulnerability allows remote attackers to 
unauthorized include local file/path requests or system 
specific path commands to compromise the mobile web-application.

The web vulnerability is located in the `filename` value of the `Upload Files` 
module. Remote attackers are able to inject own files with malicious 
`filename` values in the `Upload Files` POST method request to compromise the 
mobile web-application. The local file/path include execution occcurs in 
the index file dir listing of the wifi interface. The attacker is able to 
inject the local file include request by usage of the `wifi interface` 
in connection with the vulnerable upload files POST method request. 

Remote attackers are also able to exploit the filename issue in combination 
with persistent injected script codes to execute different malicious 
attack requests. The attack vector is located on the application-side of the 
wifi service and the request method to inject is POST. 

The security risk of the local file include vulnerability is estimated as high 
with a cvss (common vulnerability scoring system) count of 7.1. 
Exploitation of the local file include web vulnerability requires no user 
interaction or privilege web-application user account. 
Successful exploitation of the local file include vulnerability results in 
mobile application compromise or connected device component compromise.

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

Vulnerable Module(s):
                                [+] Upload Files

Vulnerable Parameter(s):
                                [+] filename

Affected Module(s):
                                [+] Index File Dir Listing (http://localhost/)


Proof of Concept (PoC):
=======================
The file include web vulnerability can be exploited by remote attackers without 
privilege 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">"./[LOCAL FILE INCLUDE VULNERABILITY!]></p></td>
        <td class="column-size">


--- PoC Session Logs [POST] ---
13:08:40.079[167ms][total 167ms] Status: 200[OK]
POST http://localhost:8080/upload Load Flags[LOAD_BYPASS_CACHE  ] Größe des 
Inhalts[2] 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]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      X-Requested-With[XMLHttpRequest]
      Referer[http://localhost:8080/]
      Content-Length[820]
      Content-Type[multipart/form-data; 
boundary=---------------------------20192471318021]
      Connection[keep-alive]
      Pragma[no-cache]
      Cache-Control[no-cache]
   POST-Daten:
      POST_DATA[-----------------------------20192471318021
Content-Disposition: form-data; name="path"
/
-----------------------------20192471318021
Content-Disposition: form-data; name="files[]"; filename="./[LOCAL FILE INCLUDE 
VULNERABILITY!]2.png"
Content-Type: image/png
---
13:08:42.198[75ms][total 75ms] Status: 200[OK]
GET http://localhost:8080/list?path=%2F[LOCAL FILE INCLUDE VULNERABILITY]2.png 
Load Flags[LOAD_BACKGROUND  LOAD_BYPASS_LOCAL_CACHE_IF_BUSY ] Größe des 
Inhalts[692] 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]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      X-Requested-With[XMLHttpRequest]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   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 local file include web vulnerability in the My.WiFi 
USB Drive app is estimated as high. (CVSS 7.1)


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


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