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[FD] UDID+ v2.5 iOS - Mail Command Inject Vulnerability

Document Title:
===============
UDID+ v2.5 iOS - Mail Command Inject Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1542


Release Date:
=============
2015-07-06


Vulnerability Laboratory ID (VL-ID):
====================================
1542


Common Vulnerability Scoring System:
====================================
5.7


Product & Service Introduction:
===============================
UDID+ is a simple tool that displays the Unique Device Identifier (UDID) and 
other information of your iOS device. It works on iPod touches, 
iPhones and iPads allows you to either email the UDID to someone, or to copy 
it. The UDID is used by developers so they can add your device 
to their Ad Hoc distribution profiles. This allows them to create a special 
version of their apps that can be run on your device outside of 
the normal App Store distribution channels. Ad Hoc distribution is perfect for 
beta testing as well as for small in-house projects with an 
limited distribution group, of up to 100 devices.

(Copy of the Vendor Homepage: https://itunes.apple.com/us/app/udid+/id385936840 
)


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered an application-side 
command inject web vulnerability in the official UDID+ v2.5 iOS mobile 
web-application.


Vulnerability Disclosure Timeline:
==================================
2015-07-06:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
EMonster Inc.
Product: UDID+ - iOS Mobile Web Application 2.5


Exploitation Technique:
=======================
Local


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


Technical Details & Description:
================================
A local command inject web vulnerability has been discovered in the official 
UDID+ v2.5 iOS mobile web-application.
The vulnerability allows to inject malicious script codes to the 
application-side of the vulnerable iOS mobile app.

The vulnerability is located in the device name value of the send by mail 
function. Local attackers are able to 
manipulate the name value of the device to compromise the mail function of the 
udid+ mobile app. The html encoding 
is broken in the send by mail export function. Local attackers are able to 
manipulate the device name id to compromise 
the application internal validation via send by email. The attack vector of the 
vulnerability is server-side and the 
injection point is the device name information settings.

The security risk of the local commandpath inject vulnerability is estimated as 
medium with a cvss (common vulnerability 
scoring system) count of 5.7. Exploitation of the commandpath inject 
vulnerability requires a low privilege androidios 
device account with restricted access and no user interaction. Successful 
exploitation of the vulnerability results in 
unauthorized execution of system specific commands and unauthorized path value 
requests to compromise the mobile iOS 
application and connected device components.

Vulnerable Module(s)
                                [+] Device - Settings - Information
 
Vulnerable Parameter(s)
                                [+] device cell name (cid)

Affected Module(s)
                                [+] UDID+ - Mail


Proof of Concept (PoC):
=======================
The application-side validation web vulnerability can be exploited by local 
attackers with low privilege or restricted device user account and without user 
interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

PoC: UDID+ Send Mail

<html><head><title>UDID+</title>
<link rel="important stylesheet" 
href="chrome://messagebody/skin/messageBody.css">
</head><body>
<table border=0 cellspacing=0 cellpadding=0 width="100%" class="header-part1">
<tr><td><b>Betreff: </b>UDID+</td></tr><tr><td><b>Von: </b>Benjamin Mejri Kunz 
<vulnerabilitylab@xxxxxxxxxx></td></tr>
<tr><td><b>Datum: </b>28.06.2015 20:49</td></tr></table><table border=0 
cellspacing=0 cellpadding=0 width="100%" class="header-part2">
<tr><td><b>An: </b>aki <bkm@xxxxxxxxxxxxxxxxx></td></tr></table><br>
<html><head><meta http-equiv="content-type" content="text/html; "></head><body 
dir="auto"><div>Here is my device information.<br><br>
<b>UDID:</b> FFFFFFFFC63FF684821B430C91F7F41D4D8A2F3A<br>
<b>Device Name:</b> bkm337>" src="cid:">%20<./[LOCAL FILE INCLUDE VULNERABILITY 
VIA DEVICE CELL NAME VALUE!]
<b>System Name:</b> iPhone OS<br />
<b>System Version:</b> 8.3<br />
<b>Platform:</b> iPad 3G WiFi<br />
<b>Hardware Model:</b> P101AP<br />
<b>Processors:</b> 2<br />
<b>CPU Frequency:</b> 0 Hz<br />
<b>Bus Frequency:</b> 0 Hz<br />
<b>Physical Memory:</b> 1 GB<br />
<b>Non-Kernel Memory:</b> 809,21 MB<br />
<b>Model:</b> iPad<br />
<b>Localized Model:</b> iPad<br />
<b>Language:</b> de<br />
<b>Locale:</b> de_DE<br />
<b>Capacity:</b> 32 GB<br />
<b>Formatted:</b> 27,19 GB<br />
<b>Used:</b> 26,38 GB<br />
<b>Free:</b> 825,48 MB<br />
<b>Battery State:</b> Unplugged<br />
<b>Battery Level:</b> 65 %<br />
<b>Local IP:</b> 192.168.2.104<br />
<b>MAC Address:</b> 02:00:00:00:00:00<br />
<br />
<a href="<a 
href="http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=385936840";>http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware
?id=385936840</a>">Download</a> UDID+ for iPod touch, iPhone, iPad and iPad 
mini.<br />
<br />
This email was sent using UDID+ version 2.5 by emonster k.k.<br />
For more information please visit our website <a href='<a 
href="http://www.emonster.com/'">http://www.emonster.com/'</a>>
<a href="http://www.emonster.com";>www.emonster.com</a></a><br 
/></iframe></div><div></div></body></html>
</body>
</html>


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the vulnerable 
device cell name output value.
Restrict the input and disallow usage of special chars next to sending the data 
by mail to the own account.


Security Risk:
==============
The security risk of the local command inject web vulnerability in the UDID+ 
app is estimated as medium. (CVSS 5.7)


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


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