iUSB 1.2 Arbitrary Code Execution

`Document Title:  
===============  
iUSB v1.2 iOS - Arbitrary Code Execution Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1374  
  
  
Release Date:  
=============  
2014-12-10  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1374  
  
  
Common Vulnerability Scoring System:  
====================================  
8.7  
  
  
Product & Service Introduction:  
===============================  
This is very useful software for iDevices users, it lets you share all types of files easily and quickly via wifi.   
The main functions of iUSB. Share files directly to iDevices via wifi. Share files via wifi using a web browser to   
the device or computer. Share files via cable to a computer. Manage files and folders easily and efficiently.   
Allows to open almost common files with formats: MP3, MP4, M4V, MOV, XLS, KEY.ZIP, NUMBERS.ZIP, PAGES.ZIP, PDF, PPT,   
DOC, RTF, RTFD.ZIP, KEY, NUMBERS, PAGES, TXT, CSV, HTML, HTM. Support for secure your data simply and quickly.  
  
(Copy of the Vendor Homepage: https://itunes.apple.com/de/app/iusb/id903716126 )  
  
  
Abstract Advisory Information:  
==============================  
The Vulnerability Laboratory Research team discovered an arbitrary code execution vulnerability in the official iUSB v1.2 iOS mobile web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2014-12-10: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Trung Pham  
Product: iUSB - Mobile Web Application (Wifi) 1.2  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
High  
  
  
Technical Details & Description:  
================================  
A code execution vulnerability has been discovered in the official iUSB v1.2 iOS mobile web-application.  
The issue allows remote attackers to execute arbitrary codes to compromise the mobile wifi web-application.  
  
The issue is located in the `path` value of the `create folder` input field. Remote attackers with access to the   
wifi web interface are able to execute system specific codes by usage of the vulnerable `create folder` function.  
The execution of the injected code occurs on the application in the iUSB wifi interface index item listing module.  
The attack vector is located on the application-side of the app and the request method to execute the code is POST.  
  
The security risk of the code execution vulnerability is estimated as high with a cvss (common vulnerability scoring   
system) count of 8.7. Exploitation of the code execution vulnerability requires no privileged application user account   
or user interaction. Successful exploitation of the code execution vulnerability results in mobile application compromise   
and affected or connected device component compromise.  
  
Request Method(s):  
[+] POST  
  
Vulnerable Module(s):  
[+] Create Folder  
  
Vulnerable Parameter(s):  
[+] path  
  
Affected Module(s):  
[+] iUSB File Dir Listing  
  
  
Proof of Concept (PoC):  
=======================  
The code execution vulnerability can be exploited by remote attackers without privileged application user account or user interaction.  
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue.  
  
  
PoC: iUSB Wifi UI - (foldername)  
  
<div class="container">  
<div class="page-header">  
<h1>iUSB</h1>  
</div>  
<p>Drag & drop files on this window or use the "Upload Files…" button to upload new files.</p>  
<div id="alerts"></div>  
<div class="btn-toolbar">  
<button type="button" class="btn btn-primary fileinput-button">  
<span class="glyphicon glyphicon-upload"></span> Upload Files…  
<input id="fileupload" name="files[x]" multiple="" type="file">  
</button>  
<button type="button" class="btn btn-success" id="create-folder">  
<span class="glyphicon glyphicon-folder-close"></span> Create Folder…  
</button>  
<button type="button" class="btn btn-default" id="reload">  
<span class="glyphicon glyphicon-refresh"></span> Refresh  
</button>  
</div>  
<div class="panel panel-default uploading">  
<div class="panel-heading">File Uploads in Progress</div>  
<table class="table table-striped"><tbody id="uploads"></tbody></table>  
</div>  
<div class="panel panel-default">  
<div class="panel-heading">  
<ol class="breadcrumb" id="path"></ol>  
</div>  
<table class="table table-striped"><tbody id="listing">./[CODE EXECUTION VULNERABILITY!];</tbody></table>  
</div>  
<p class="footer">iUSB 1.2</p>  
</div>  
  
  
--- PoC Session Logs [POST] ---  
Status: 200[OK]  
POST http://192.168.2.104/create   
Load Flags[LOAD_BYPASS_CACHE LOAD_BACKGROUND ] Größe des Inhalts[2] Mime Type[application/json]  
Request Header:  
Host[192.168.2.104]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0]  
Accept[application/json, text/javascript, */*; q=0.01]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
Content-Type[application/x-www-form-urlencoded; charset=UTF-8]  
X-Requested-With[XMLHttpRequest]  
Referer[http://192.168.2.104/]  
Content-Length[81]  
Connection[keep-alive]  
Pragma[no-cache]  
Cache-Control[no-cache]  
POST-Daten:  
path[./[CODE EXECUTION VULNERABILITY!];+%3C]  
Response Header:  
Server[WebUploader]  
Cache-Control[no-cache]  
Content-Length[2]  
Content-Type[application/json]  
Connection[Close]  
Date[Tue, 09 Dec 2014 19:03:58 GMT]  
-  
Status: 200[OK]  
GET http://192.168.2.104/./[CODE EXECUTION VULNERABILITY!];   
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[-1] Mime Type[application/x-unknown-content-type]  
Request Header:  
Host[192.168.2.104]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0]  
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]  
Connection[keep-alive]  
Response Header:  
Server[WebUploader]  
Date[Tue, 09 Dec 2014 19:04:58 GMT]  
Connection[Close]  
  
  
Reference(s):  
http://localhost/create   
  
  
Solution - Fix & Patch:  
=======================  
The vulnerability can be patched by a secure restriction of the create folder name input field. Restrict the input by disallow of special chars.  
Encode and parse the vulnerable path value that runs throught eh creat POST method request. Filter and parse also the iUSB file dir listing output with the vulnerable name value.  
  
  
Security Risk:  
==============  
The security risk of the of the code execution vulnerability in the create folder function of iUSB is estimated as high. (CVSS 8.8)  
  
  
Credits & Authors:  
==================  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected]) [www.vulnerability-lab.com]  
  
  
Disclaimer & Information:  
=========================  
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