HTC HD2 Mobile Phone - Lock Screen Keyboard Bypass

Document Title:
===============
HTC HD2 Mobile Phone - Lock Screen Keyboard Bypass



Release Date:
=============
2011-07-19


Vulnerability Laboratory ID (VL-ID):
====================================
185


Product & Service Introduction:
===============================
Der HTC HD2 liefert Ihnen ein Benutzererlebnis, auf das Ihre Sinne gewartet haben. Sein hochauflösendes Display 
mit 10,9-cm-Bildschirmdiagonale ist einfach überwältigend. Als weltweit erstes Windows® phone mit kapazitivem 
Touchscreen und 1 GHz-Prozessor reagiert er außerdem so präzise und schnell auf leichte Berührungen Ihrer Finger, 
wie Sie es noch nie erlebt haben.

Als erstes Windows® phone mit HTC Sense™ bietet er Ihnen eine leichte und intuitive Bedienbarkeit. Das HTC Sense™-
Erlebnis basiert auf drei grundlegenden Prinzipien: „Make it Mine“, „Stay Close“ und „Discover the Unexpected“.

(Copy of the Vendor Homepage: http://www.htc.com/de/product/hd2/overview.html)


Abstract Advisory Information:
==============================
Vulnerability-Lab Team discovered a login screen bypass for the new HTC HD2 with windows 6.x mobile.


Vulnerability Disclosure Timeline:
==================================
2011-06-07:	Vendor Notification
2011-00-00:	Vendor Response/Feedback
2011-00-00:	Vendor Fix/Patch
2011-06-17:	Public or Non-Public Disclosure


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


Affected Product(s):
====================

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


Severity Level:
===============
High


Technical Details & Description:
================================
A Lock Screen bypass vulnerability is detected on the HTC HD2 with windows 6.x mobile. The bug allows 
to switch out of the stand-by mode with the sms keyboard tastatur. It s also possible to read contacts 
or calender after switching out from the stand-by mode of the smart phone.

Vulnerable Module(s):
			[+] Lock Screen


Pictures:
			../100_3638.png
			../100_3639.JPG
			../100_3639.png
			../100_3640.JPG
			../100_3642.JPG
			../100_3643.JPG
			../100_3644.JPG
			../100_3645.JPG
			../100_3646.JPG
			../100_3646.png
			../100_3647.JPG
			../100_3647.png


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by local or remote attacker after the stand-by switch mode & reactiviation.
For demonstration or reproduce ...

Manually reproduce ...

1. Klick Software Update
2. Switch out the Keyboard by the slide button
3. Press Standby & hold the keyboard key
4. Press again Stand-by and Hold the button
5. Now you can use the Tastatur and Calender out-side of the Lock-Screen :)


Video PoC:
			../bypass-record.AVI
			../standard-auth-HTC-HD2.AVI


Security Risk:
==============
The security risk of the lock screen bypass vulnerability is estimated as medium because need to be activated ago from stand-by.


Credits & Authors:
==================
Vulnerability Research Laboratory


Disclaimer & Information:
=========================
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