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RIM Blackberry buffer overflow, DoS, data loss

Classification:
===============
Level: low-med-[HIGH]-crit
ID: HEXVIEW*2004*10*12*1

Overview:
=========
RIM Blackberry is a Java-based wireless connectivity solution providing
phone, e-mail, and other services on a variety of handheld devices.

Affected products:
==================
All tests were performed on a RIM Blackberry 7230 with RIM Blackberry
Operating System software version 3.7.1.41. The Blackberry was synchronized
with Microsoft Exchange server using Blackberry Enterprise Server for
Microsoft Exchange.

Cause and Effect:
=================
Insufficient data validation for incoming calendar data makes possible
to cause buffer overflow condition leading to stack corruption. As a result,
it is possible to reboot the device (all stored messages will be lost since
RAM storage will be reinitialized). It is also possible to execute code
embedded by the attacker. It should be mentioned that Blackberry developers
tools are freely available.

Demonstration:
==============
The issue can easily be reproduced by sending a standard Microsoft Outlook
meeting request message with very long string (over 128K) in the "Location:"
field. To force immediate user notification, set meeting date/time to the
past. The Blackberry reboots when it tries to notify the user. No user action
is required. It is possible to render Blackberry device completely useless by
queuing a number of such messages into user's mailbox.

Vendor Status:
==============
At the time of release vendor was not aware of the vulnerability.
HexView does not notify vendors unless there is a prior agreement to do so.
Vendors interested in receiving notifications prior to public disclosure 
or more detailed analysis may obtain more information by writing to the
e-mail address provided at the end of the document.

About HexView:
==============
HexView contributes to online security-related lists for almost a decade.
The scope of our expertize spreads over Windows, Linux, Sun, MacOS platforms,
network applications, and embedded devices. The chances are you read our
advisories or disclosures. For more information visit http://www.hexview.com

Distribution:
=============
This document may be freely distributed through any channels as long as the
contents are kept unmodified. Commercial use of the information in the document
is not allowed without written permission from HexView signed by our pgp key.

Feedback and comments:
======================
Feedback and questions about this disclosure are welcome at vtalk@hexview.com

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