Date: Wed, 07 Feb 2007 14:26:40 -0500
From: iDefense Labs <labs-no-reply@...fense.com>
To: vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk,
	bugtraq@...urityfocus.com
Subject: iDefense Security Advisory 02.07.07: Trend Micro AntiVirus UPX Parsing
 Kernel Buffer Overflow Vulnerability

Trend Micro AntiVirus UPX Parsing Kernel Buffer Overflow Vulnerability

iDefense Security Advisory 02.07.07
http://labs.idefense.com/intelligence/vulnerabilities/
Feb 07, 2007

I. BACKGROUND

The Trend Micro AntiVirus scan engine provides anti-virus capabilities to
desktop, server and gateway systems. The engine is licensed to several of
Trend Micro's OEM partners. More information is available on Trend Micro's
web site at the following URL.

http://www.trendmicro.com/

II. DESCRIPTION

Remote exploitation of a buffer overflow vulnerability within Trend Micro's
AntiVirus engine could allow an attacker to crash the scan engine or
execute arbitrary code.

This vulnerability is caused by improper input validation when scanning
specially crafted malformed UPX compressed executables. Memory corruption
could occur leading to a invalid memory access or a potentially
exploitable condition.

III. ANALYSIS

Exploitation allows attackers to crash the scan engine or execute arbitrary
code.

This vulnerability could be used to gain unauthorized access to machines
through common protocols, e.g. SMTP, HTTP, FTP. No authentication is
required for an attacker to leverage this vulnerability.

Under Windows, the scan engine runs in kernel context. Under Linux, the
scan engine runs as a daemon with superuser privileges. As such, an
attacker can take complete control of the affected system if successful
code execution is attained.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in our
vulnerability lab. The configurations at verification time were as
follows:

 * Trend Micro's PC-Cillin Internet Security 2007
 * VsapiNI.sys (scan engine) version 3.320.0.1003

 * ServerProtect for Linux v2.5 on RHEL 4.x
 * vsapiapp version 8.310

Any implementations based on Trend Micro's AntiVirus scan engine are
likely vulnerable in their default configuration.

V. WORKAROUND

iDefense is currently unaware of any effective workaround for this issue.

VI. VENDOR RESPONSE

"To address this vulnerability, Trend Micro recommends customers to update
to Virus Pattern File 4.245.00 or higher."

For more information, consult the Trend Micro Knowledge Base article at
the link shown below.

http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-1034289

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

01/17/2007  Initial vendor notification
01/19/2007  Initial vendor response
02/07/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2006 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@...fense.com 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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