BlueMe Bluetooth v5.0 iOS - Code Execution Vulnerability

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Document Title:
===============
BlueMe Bluetooth v5.0 iOS - Code Execution Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1251


Release Date:
=============
2014-04-08


Vulnerability Laboratory ID (VL-ID):
====================================
1251


Common Vulnerability Scoring System:
====================================
9.2


Product & Service Introduction:
===============================
New version is live on AppStore, we added many new functions. Please upgrade. 
In case you are facing any issues, feel free to write 
on blueme@xxxxxxxxx , we will immediate resolve your concern. Kindly post bad 
reviews only if we are not able to solve your concerns.
OVER 2 Million downloads! Transfer any file format now! Rated best app for 
bluetooth transfer. BlueMe – We have added many new functions 
based on our users request. Thanks a lot for supporting and downloading our 
application.

(Copy of the Homepage: https://itunes.apple.com/in/app/blueme/id456598582 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a remote code execution 
vulnerability in the official HyTech Professionals BlueMe v5.0 iOS mobile 
bluetooth application.


Vulnerability Disclosure Timeline:
==================================
2014-04-08:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
HyTech Professionals
Product: Blue Me Bluetooth - iOS Mobile Application 5.0


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


Severity Level:
===============
Critical


Technical Details & Description:
================================
A remote code execution web vulnerability has been discovered in the official 
HyTech Professionals BlueMe v5.0 iOS mobile bluetooth application.
The vulnerability allows an remote attackers to execute own malicious system 
specific codes to compromise the iOS bluetooth mobile application.

The vulnerability is located in the body > message context input and affects 
the bluetooth message listing. Remote attackers are able to inject 
own system specific codes in the bluetooth message listing to compromise mobile 
application. The message input is not encoded or parsed 
and the app functions itself only allows to send text and pictures of the local 
storage (phone album). The exploit can also be combined with 
a loop codes to crash the app or own web script codes (htmls,php or js) to 
perform further attacks and persistent manipulation of modules.
The injection method requires an exchange with another connected bluetooth chat 
user and the attack vector is located on the application-side 
of the vulnerable mobile application. The attacker includes his message with 
the code execution payload and the code execution occurs after 
the message has been send to the local bluetooth service. The execution of the 
system specific code occurs in the chat messages output listing 
and chat history. The code execution in the message listing does not require a 
link ref click or mouse-over (interaction) and executes directly 
on the arrival. The security risk of the remote code execution web 
vulnerability is estimated as critical with a cvss (common vulnerability 
scoring system) count of 9.0(+)|(-)9.1.

Exploitation of the code execution vulnerability requires a connected bluetooth 
user to chat and no privileged account. User interaction connect 
and accept is required to interact with another user via bluetooth. Successful 
exploitation of the remote vulnerability results in mobile 
application compromise and connected or affected device component compromise.

Note: The Bluetooth Text Chat v1.0 iOS uses the same vulnerable code engine 
(http://www.vulnerability-lab.com/get_content.php?id=1250)

Request Method(s):
                                [+] Bluetooth (Chat > POST)

Vulnerable Module(s):
                                [+] Bluetooth Chat IM

Vulnerable Input(s):
                                [+] message

Vulnerable Parameter(s):
                                [+] body > message context

Affected Module(s):
                                [+] Messages Listing
                                [+] Message History


Proof of Concept (PoC):
=======================
The system specific code execution vulnerability can be exploited by remote 
attackers via bluetooth, without required user interaction but the connection 
for messaging needs to be accepted. For security demonstration or to reproduce 
the code execution vulnerability follow the provided information and steps 
below to continue.

Requirement(s):
1. 2 x iOS devices (Tested: iPhone (A) and a iPad (B) with iOS v7.1)
2. Mobile application > https://itunes.apple.com/in/app/blueme/id456598582
3. Both devices need the bluetooth module (active)

Manually steps to reproduce the vulnerability ...
1. Install the application on both ios devices ( 
https://itunes.apple.com/in/app/blueme/id456598582 )
2. Start both applications and sync the bluetooth chat connection of device A 
to B
3. Accept the connection at device B of the A device request
4. Include a system specific code inside of the message body input field and 
press send/submit
5. The code execution occurs to everybody (A & B) who is listed as user in the 
same chat conversation
Note: The target user does not need to click or interact with the attacker the 
message only needs to arrive
6. Successful reproduce of the bluetooth blue me app remote code execution 
vulnerability!


Picture(s):
http://www.vulnerability-lab.com/resources/pictures/1251/1.png


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the message 
body text input. Filter and encode also the vulnerability messages output 
listing 
after the input and the message history to  prevent further code execution or 
injection attacks.


Security Risk:
==============
The security risk of the system specific code execution web vulnerability in 
the messages listing is estimated as critical.


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


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