USB Disk Free v1.0 iOS - File Include Vulnerability

Document Title:
===============
USB Disk Free v1.0 iOS - File Include Vulnerability


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


Release Date:
=============
2014-10-10


Vulnerability Laboratory ID (VL-ID):
====================================
1340


Common Vulnerability Scoring System:
====================================
6.1


Product & Service Introduction:
===============================
USB Disk is your File Manager which support Music Player, Video Player, Photo Viewer, PDF Reader, Document Viewer and Zip & RAR Extractor .

Support the following file types:
- Music & Songs: MP3, M4A, W4P, WP4, AAC, WAV, CAF
- Video & Movie: MP4, M4V, MOV, MPV, 3GP
- Photo & Images: BMP, PNG, JPG, JPEG, GIF, TIF, TIFF, ICO
- Document: PDF, TXT, PAGES, NUMBERS, KEY, DOC, DOCX, XLS, XLSX, PPT, PPTX, RTF
- Archive: ZIP, RAR, 7Z

(Copy of the Vendor Homepage: https://itunes.apple.com/au/app/usb-disk-free-file-manager/id908003044 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a file include vulnerability in the official USB Disk Free - File Manager & File Transfer v1.0 iOS mobile application.


Vulnerability Disclosure Timeline:
==================================
2014-10-10: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Yajing Qian
Product: USB Disk Free (File Manager & Wifi File Transfer) - iOS Web Application 1.0


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


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


Technical Details & Description:
================================
A local file include web vulnerability has been discovered in the official USB Disk Free - File Manager & Transfer v1.0 iOS mobile 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 `newfile upload` module. Remote attackers are able to inject own files with malicious 
`filename` values in the `newfile` POST method request to compromise the mobile web-application. The local file/path include execution occcurs in the 
index dir listing of the wifi interface context. The attacker is able to inject the local file include request by usage of the `wifi interface` in 
connection with the vulnerable newfile upload request. 

Remote attackers are also able to exploit the filename issue in combination with persistent injected script codes to execute different local 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 web vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.1. 
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):
				[+] newfile

Vulnerable Parameter(s):
				[+] filename

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


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

PoC: Link
POST http://localhost:8080/./[LOCAL FILE INCLUDE VULNERABILITY].*


PoC: Exploit

<tbody><tr><th>Name</th><th>Size</th></tr><tr><th colspan="3"><hr></th></tr><tr><td><a href="../">Parent Directory</a></td>
<td>-</td></tr><tr><td><a href="5235.jpg">5235.jpg</a></td><td align="right">4.7 KB</td></tr>
<tr><td><a href="<./[FILE INCLUDE VULNERABILITY VIA FILENAME TO PATH VALUE!].png"><./[FILE INCLUDE VULNERABILITY VIA FILENAME TO PATH VALUE!]">
./[FILE INCLUDE VULNERABILITY VIA FILENAME TO PATH VALUE!].png</a></td><td align="right">689.0 Byte</td></tr><tr><th colspan="3"><hr></th>
</tr></tbody></table></body></html></iframe></a></td></tr></tbody>


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://localhost:8080/ Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[793] Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0]
      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[-----------------------------18827278717040
Content-Disposition: form-data; name="newfile"; filename="./[FILE INCLUDE VULNERABILITY VIA FILENAME TO PATH VALUE!].png"
Content-Type: image/png
-

Status: 200[OK]
GET http://localhost:8080/./[FILE INCLUDE VULNERABILITY VIA FILENAME TO PATH VALUE!] Load Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[0] Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0]
      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]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[0]
      Date[Thu, 09 Oct 2014 22:25:38 GMT]


Solution - Fix & Patch:
=======================
The security vulnerability can be patched by a secure parse and encode of the file name value in the upload POST method request or sync.
Encode the file dir listing names and data output values to prevent further file include attacks. Restrict the file name extension validation 
to fully secure the upload mechanism.


Security Risk:
==============
The security risk of the local file include web vulnerability in the wifi file manager upload module is estimated as high.


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


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