Title:
======
USB Sharp v1.3.4 iPad iPhone - Multiple Web Vulnerabilities


Date:
=====
2013-02-16


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=873


VL-ID:
=====
873


Common Vulnerability Scoring System:
====================================
6.3


Introduction:
=============
USB Sharp Pro can turn your iPhone, ipad, ipod into a large Capacity, Portable and Wireless storage disk, 
Facilitate and efficient manage of your files!

Support for editing php, js, html file.
Support the open format, such as flv,asf,rmvb,avi,mpg,mkv,wmv.
Dropbox Operate, multiple files upload & download, history,create folder
Add manual
Chrome and Firefox Supported upload multiple files
Extract files from encryption .rar
Optimization pdf reader,
Support for importing videos/photos to Photo Library
Support for exporting video from Photo Library
Search file(folder) name function added
Picture Viewer Improved
Unzip type added
Add authentication for local login
Add authentication for wifi transfer
Custom background image;
...   ...   ...
Full screen view files Supported
Multiple photo import Supported
Sorting by file name?create time and file type
View, copy, move, delete, rename, email, zip Compression and unzip files/folders
Encryption folder, protect your files
Extract all files from a compressed .zip file
Glide deleting function
Select all and Cancel all operate
Transferring files by wifi and iTunes file sharing
Email multiple files, folder Supported
Open email attachments
Photo import Supported
Open files in other applications
Landscape mode supported
iPad-compatible

Plain text: .txt .php .js .html
Document: .pdf .csv .rtf .rtfd .doc .docx .xls .xlsx .ppt .pptx (office 2003 or later)
Image: .png .jpg .jpeg .gif .bmp .xbm .tif .tiff
Audio: .mp3 .m4a .aac
Video: .mp4 .mov .m4v .3gp .flv .asf .rmvb .avi .mpg .mkv .wmv
Web: .htm .html .xhtml
Compressed: .zip .rar

Cost: 2,99$ - iPad or iPhone (iTunes or Appstore)

(Copy of the Homepage: https://itunes.apple.com/us/app/usb-sharp-pro/id436590784 )


Abstract:
=========
The Vulnerability Laboratory Research Team discovered multiple web vulnerabilities in the mobile USB Sharp v1.3.4 app for the apple ipad & iphone.


Report-Timeline:
================
2013-02-16:  Public Disclosure


Status:
========
Published


Affected Products:
==================
Apple AppStore
Product: USB Sharp - Web Server Application 1.3.4


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


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


Details:
========
1.1
A local file include web vulnerability via POST request method is detected in the mobile USB Sharp v1.3.4 app for the apple ipad & iphone.
The vulnerability allows remote attackers via POST method to inject local app webserver folders to request unauthorized local webserver files.

The vulnerbility is located in the upload file module of the webserver (http://192.168.0.10/) when processing to load a manipulated 
filename via POST. The execution of the injected path or file request will occur when the attacker is processing to watch the file dir listing.

Exploitation of the vulnerability requires no user interaction and can be done without privileged application user account (no password standard).
Successful exploitation of the vulnerability results in unauthorized path or file access via local file or path include attack.

Vulnerable Application(s):
        [+] USB Sharp v1.3.4 - ITunes or AppStore (Apple)

Vulnerable Module(s):
        [+] File Upload  (Web Server) [Remote]

Vulnerable Parameter(s):
        [+] filename

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



1.2
A persistent input validation vulnerability is detected in the mobile USB Sharp v1.3.4 app for the apple ipad & iphone.
The bug allows an attacker (remote) to implement/inject malicious script code on the application side (persistent) of the app web service. 

The vulnerability is located in the index file dir listing module of the webserver (http://192.168.0.10:41491/) when processing to inject
via POST method manipulated new chxItem parameters. The persistent script code will be executed out of the main index file dir listing 
module when the service is processing to list the new foldername as item. 

Exploitation of the vulnerability requires low or medium user interaction without privileged application user account.
Successful exploitation of the vulnerability can lead to persistent session hijacking (customers), account steal via persistent web 
attacks, persistent phishing or stable (persistent) certificate mail notification context manipulation.

Vulnerable Application(s):
        [+] USB Sharp v1.3.4 - ITunes or AppStore (Apple)

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

Vulnerable Parameter(s):
        [+] Foldername (items > chxItem)

Affected Module(s):
        [+] Index Listing


Proof of Concept:
=================
1.1
The local file include web vulnerability can be exploited by remote attackers without user interaction and without 
privileged application user account. For demonstration or reproduce ...

Example:
File > Upload via POST > Tamper Session > Change Filename Value to File or Path + Extension > Open Listing > Execution 

PoC: (POST)
-----------------------------1337341202721337
Content-Disposition: form-data; name="file"; filename="..%2F..%2F..%2F..%2Fcmd>home>tmp%00<'.JPG"
Content-Type: image/jpg

Note: Encode the request ago to bypass the encoding validation of the input. (%2F)

Reference(s):
http://192.168.0.10:41491/


1.2
The persistent input validation vulnerability can be exploited by remote attackers without user interaction and without 
privileged application user account. For demonstration or reproduce ...


PoC: Index - Folder Dir Listing

<tbody id="filelist"><tr><td><input name="chxItem" value="[PERSISTENT INJECTED SCRIPT CODE!]" 
onclick="selChkItem(this)" type="checkbox"></td><td><a href="/[PERSISTENT INJECTED SCRIPT CODE!]%3C?guid=
47E79C76-D4C2-4086-B695-3CEE71A6B5F3&type=child" class="file"><span style="vertical-align:middle;"><img src="/Folder.png" 
style="border:0;vertical-align:middle" ;=""></span>%20"><[PERSISTENT INJECTED SCRIPT CODE!];)" <<="" a=""></td><td></td>
<td>2013-02-10 22:57:54</td><td><input name="commit" type="button" value="Delete" 
onclick="DelegateData('/[PERSISTENT INJECTED SCRIPT CODE!]','47E79C76-D4C2-4086-B695-3CEE71A6B5F3');" 
class='button' /></form></td></tr></tbody></table></iframe></a></td></tr><tr><td colspan="5"><span class="total">1 items</span>
</td></tr></tbody>


Reference(s):
http://192.168.0.10:41491/


Risk:
=====
1.1
The security risk of the local file/path include web vulnerability via POST request method is estimated as high(+).

1.2
The security risk of the persistent input validation web vulnerability is estimated as medium.


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


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===========
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