Notes v4.5 iOS - Arbitrary File Upload Vulnerability

Document Title:
===============
Notes v4.5 iOS - Arbitrary File Upload Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1832


Release Date:
=============
2016-04-24


Vulnerability Laboratory ID (VL-ID):
====================================
1832


Common Vulnerability Scoring System:
====================================
6


Product & Service Introduction:
===============================
xNotes, My Personal Documents, Diary.

(Copy of the Homepage:  http://appshopper.com/utilities/x-notes-my-personal-documents  )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered an arbitrary file upload vulnerability in the official Notes v4.5 iOS mobile web-application (wifi).


Vulnerability Disclosure Timeline:
==================================
2016-04-25: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Shanmin Xu
Product: xNotes - Mobile API (Web-Application) 4.5


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


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


Technical Details & Description:
================================
A arbitrary file upload web vulnerability has been discovered in the official Notes v4.5 iOS mobile web-application (wifi).
The local file include web vulnerability allows remote attackers to unauthorized include local file/path requests via POST.

The web vulnerability is located in the `filename` values of the `Upload File` module. Remote attackers are able to inject own 
files with malicious `filename` values in the `upload.action` POST method request to compromise the mobile web-application. 
The arbitrary file upload execute occcurs in the index file dir listing of the wifi interface. The attacker is able to inject 
the local file upload form request by usage of the `wifi interface` in connection with the vulnerable upload service module.

The security risk of the vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.0. 
Exploitation of the arbitrary file upload vulnerability requires no user interaction or privileged web-application user account. 
Successful exploitation of the arbitrary file upload web vulnerability results in mobile web-application or device compromise.

Request Method(s):
					[+] POST

Vulnerable Module(s):
					[+] Upload

Vulnerable Parameter(s):
					[+] filename

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


Proof of Concept (PoC):
=======================
The arbitrary file upload web vulnerability can be exploited by remote attackers without privileged user account or user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Manual steps to reproduce the vulnerability ...
1.  Install the vulnerable ios web-application to your ios device
2.  Start the web-application
3.  Open the file transfer button on the buttom left
4.  Open the called IP in a web-browser
5.  Surf to the Upload function and choose a random test image/picture
6.  Start a http session tamper to exploit the followup POST method request
7.  Inject your local file request to the filename value for exploitation app path variable
8.  Continue the request
9.  The local filename value issue executes in the index in the next step
10. Successful reproduce of thearbitrary file upload vulnerability!

Note: on jailbroken mobiles the attacker is able to take-over the mobile system and without jailbreak the 
attacker is able to compromise the application folder path via variable request.


PoC: Exploitation
http://localhost:51025/x/./[ARBITRARY FILE UPLOAD VULNERABILITY TO PATH VARIABLE]/


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://localhost:51025/ 
   Request Header:
      Host[localhost:51025]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0]
      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:51025/]
      Connection[keep-alive]
   POST-Daten:
      POST_DATA[-----------------------------60382496219157
Content-Disposition: form-data; name="file"; filename="./[ARBITRARY FILE UPLOAD VULNERABILITY!]/"


Security Risk:
==============
The security risk of the arbitrary file upload web vulnerability in the ios web-application is estimated as high. (CVSS 6.0)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri [http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]


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