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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:
=============
2016-04-25


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


Common Vulnerability Scoring System:
====================================
6.4


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:
===============
High


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 6.4. 
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 file include 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 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
8.  Continue the request
9.  The local file include issue executes in the filename value in the next step
10. Successful reproduce of the local file include vulnerability!


PoC: Exploitation
http://localhost:51025/./[ARBITRARY FILE UPLOAD VULNERABILITY! PHP]/


--- 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! PHP]/"


Security Risk:
==============
The security risk of the arbitrary file upload web vulnerability in the ios 
web-application is estimated as high. (CVSS 6.4)


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


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