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Category:   Application (Security)  >   Trend Micro Internet Security Vendors:   Trend Micro
Trend Micro PC-cillin UPX File Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017603
SecurityTracker URL:
CVE Reference:   CVE-2007-0851   (Links to External Site)
Updated:  May 19 2008
Original Entry Date:  Feb 7 2007
Impact:   Denial of service via network, Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2005, 2006, 2007
Description:   A vulnerability was reported in Trend Micro PC-cillin. A remote user can cause arbitrary code to be executed on the target system.

A remote user can create a specially crafted UPX compressed executable file that, when processed by the target system, will trigger a buffer overflow in the Scan Engine and execute arbitrary code on the target system or cause the target service or application to crash. The code will run with the privileges of the target service or application.

All Trend Micro products and versions using the Scan Engine and Pattern File technology are affected. On Windows-based systems, the Scan Engine runs with kernel-level privileges. On Linux-based systems, the Scan Engine runs with superuser privileges.

The vendor was notified on January 17, 2007.

iDefense reported this vulnerability.

Impact:   A remote user can create a file that, when processed by the target service or application, will cause the target service or application to crash or execute arbitrary code.
Solution:   The vendor has issued a fixed version of the Scan Engine (virus pattern file 4.245.00 or higher).

The Trend Micro advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 02.07.07: Trend Micro AntiVirus UPX Parsing

Trend Micro AntiVirus UPX Parsing Kernel Buffer Overflow Vulnerability

iDefense Security Advisory 02.07.07
Feb 07, 2007


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.


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.


Exploitation allows attackers to crash the scan engine or execute arbitrary

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.


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

 * 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.


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


"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.


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


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


The discoverer of this vulnerability wishes to remain anonymous.

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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 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

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