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[FD] iFileExplorer v6.51 iOS - File Include Web Vulnerability

Document Title:
===============
iFileExplorer v6.51 iOS - File Include Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1345


Release Date:
=============
2014-10-22


Vulnerability Laboratory ID (VL-ID):
====================================
1345


Common Vulnerability Scoring System:
====================================
5.4


Product & Service Introduction:
===============================
Do you find it frustrating not being able to use your iPhone to freely transfer 
files? Would you like to be able to view your 
documents and pictures more easily? Are there some files you’d prefer to keep 
private? Do you want to upload videos or music 
to your iPhone via WIFI? iFileExplorer can help you solve these problems! It 
can transform your iPhone into a file manager, 
enabling you to view all your files on your iPhone!

(Copy of the Homepage: 
https://itunes.apple.com/us/app/ifileexplorer/id355253462 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered a local file include web 
vulnerability via sync in the official iFileExplorer v6.51 iOS mobile 
application.


Vulnerability Disclosure Timeline:
==================================
2014-10-20: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
ColorfulPhone
Product: iFileExplorer - iOS Mobile Web Application 6.51


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


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


Technical Details & Description:
================================
A local file include web vulnerability has been discovered in the official 
iFileExplorer v6.51 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 vulnerability is located in the foldername and filename values if the wifi 
interface module. Local attackers are able to manipulate the 
wifi web interface by usage of the vulnerable sync function.  The sync does not 
encode or parse the context on add of a folders or files.
Local attacker are able to manipulate the input of the files and folder to 
exploit the issue by the sync method of the web-application. 
The execution of únauthorized local file or path request occurs in the index 
file dir listing module of the ifileexplorer application.
The request method to inject is sync and the attack vector is located on the 
application-side of the affected service.

The security risk of the local file include web vulnerability is estimated as 
high with a cvss (common vulnerability scoring system) count of 7.1. 
Exploitation of the 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 or 
connected device component compromise.

Vulnerable Method(s):
                                [+] [Sync]

Vulnerable Module(s):
                                [+] Add Function & Rename

Vulnerable Parameter(s):
                                [+] foldername
                                [+] filename

Affected Module(s):
                                [+] iFileExplorer Wifi Interface - Path Dir 
Listing


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

1. Install the ios app and start the app after the install 
(https://itunes.apple.com/us/app/ifileexplorer/id355253462)
2. Open the wifi symbole in the first app sidebar category
3. Inject your own payload by usage of the `my files` section
Note: Include as Filename or Foldername your own payload to unauhtorized 
request the local file or device path
4. Sync after the add and open the wifi web interface of the application
5. The local index of the interface requests the path listing unauthorized the 
file- and foldername
6. Successful reproduce of the local security vulnerability!


PoC: iFileExplorer Index - File Manager

<tbody><tr><td class="rowTitle" align="left" bgcolor="#E3E9FF">Other</td></tr>
<tr><td align="left" bgcolor="#FFFFFF">
<table bgcolor="#FFFFFF" border="0" bordercolor="#FFFFFF" cellpadding="0" 
cellspacing="0">
<tbody><tr>
<td align="center" bgcolor="#FFFFFF" height="142" width="110">
<table bgcolor="#FFFFFF" border="0" bordercolor="#FFFFFF" cellpadding="0" 
cellspacing="0"><tbody><tr>
<td align="center" bgcolor="#FFFFFF" height="110" valign="buttom" width="110">
<a href=".bkm337"><img src="x">%20<iframe src="a">%20<iframe>png">
<img src=".bkm337"><./[LOCAL FILE INECLUDE WEB VULNERABILITY!].png?act=getico" 
width="90" height="90"  border="0"></a></td></tr>
<tr><td width="110" height="16" align="center" valign="top" 
bgcolor="#FFFFFF">.bkm3...</td></tr>
<tr><td width="110" height="16" valign="top" bgcolor="#FFFFFF">
<div align="center"><p class="font1">
<button onclick="onDelete('.bkm337"><./[LOCAL FILE INECLUDE WEB 
VULNERABILITY!].png?act=delete');" value="">Delete</button></p></div></td></tr>
</table></td>
</tr>
</table>


--- PoC Session Logs (GET) [Execution] ---
Status: 200[OK]
GET http://localhost:8080/./[LOCAL FILE INECLUDE WEB VULNERABILITY!] Load 
Flags[VALIDATE_ALWAYS ] Größe des Inhalts[-1] 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[image/png,image/*;q=0.8,*/*;q=0.5]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://localhost:8080/]
      Connection[keep-alive]
   
- Response
Status: 200[OK]
GET http://localhost:8080/./[LOCAL FILE INECLUDE WEB VULNERABILITY!] Load 
Flags[LOAD_DOCUMENT_URI  ] Größe des Inhalts[-1] 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]



Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure restriction of the add file/folder 
and rename input fields.
After the restriction the input and output needs to be encoded by a secure 
mechanism to prevent the execution itself.


Security Risk:
==============
The security risk of the local file include web vulnerability in the filename 
and foldername sync function is estimated as medium.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team]  - Katharin S. L. (CH) 
(research@xxxxxxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


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