[Full-disclosure] iDefense Security Advisory 06.25.09: Motorola Timbuktu Pro PlughNTCommand Stack Based Buffer Overflow Vulnerability

[iDefense Labs <labs-no-reply@xxxxxxxxxxxx>]

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iDefense Security Advisory 06.25.09
http://labs.idefense.com/intelligence/vulnerabilities/
Jun 25, 2009

I. BACKGROUND

Motorola Inc.'s Timbuktu Pro is a remote control software that allows
remote access to a computer's desktop. It is available for Mac OS X and
Windows systems and provides integration with Skype and SSH. More
information is available on Motorola's web site at the following URL.

http://www.netopia.com/software/products/tb2/

II. DESCRIPTION

Remote exploitation of a stack-based buffer overflow vulnerability in
Motorola Inc.'s Timbuktu Pro could allow attackers to execute arbitrary
code with SYSTEM privileges.

Timbuktu fails to properly handle user-supplied data passed through a
named pipe session. When the PlughNTCommand named pipe receives an
overly large character string, a buffer overflow will occur resulting
in arbitrary code execution.

III. ANALYSIS

Exploitation of this issue allows an attacker to execute arbitrary code
with SYSTEM privileges. An attacker would need to locate a system
running the Timbuktu Pro software. Upon finding a system that is
running the vulnerable software, the attacker would check for the
availability of the PlughNTCommand named pipe. If the named pipe is
available, the attacker can connect and create a session without
authenticating. The attacker can then send malformed data to the
Timbuktu Pro process, resulting in arbitrary code execution with
elevated privileges.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in Timbuktu
Pro version 8.6.5. Previous versions may also be affected.

V. WORKAROUND

A named pipe filter can be applied to the registry. Named pipe filtering
can be done in two ways dynamic filtering and white listing. Microsoft
provides further details about how to implement this workaround.        

Named Pipe Filter workaround: http://support.microsoft.com/kb/925890

VI. VENDOR RESPONSE

Motorola Inc. has released a patch which addresses this issue. For more
information, consult their advisory at the following URLs:

http://www.netopia.com/software/products/tb2/win/upgrade_version_8.html

http://www.netopia.com/software/products/tb2/

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2009-1394 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

07/09/2008  - Initial Contact
07/14/2008  - Initial vendor response
09/15/2008  - Vendor update received
03/12/2009  - Vendor status requested
03/12/2009  - Vendor update received
04/24/2009  - Vendor status requested
04/24/2009  - Tentative disclosure set to May 13
06/25/2009  - Coordinated Public Disclosure

IX. CREDIT

This vulnerability was reported to iDefense by Rubén Santamarta of
reversemode.com.

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http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2009 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@xxxxxxxxxxxx for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
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