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Published:

25 February 2005

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             AUSCERT External Security Bulletin Redistribution

                 ESB-2005.0189 -- ISS Protection Advisory
                Trend Micro AntiVirus Library Heap Overflow
                             25 February 2005

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Trend Micro OfficeScan Corp. Edition
                   Trend Micro Client / Server / Messaging Suite for SMB
                   Trend Micro InterScan eManager
                   Trend Micro InterScan Messaging Security Suite
                   Trend Micro InterScan VirusWall
                   Trend Micro InterScan Web Security Suite
                   Trend Micro PC-cillin Internet Security
                   Trend Micro PortalProtect for SharePoint
                   Trend Micro ScanMail eManager
                   Trend Micro ScanMail for Lotus Domino
                   Trend Micro ScanMail for Microsoft Exchange
                   Trend Micro ServerProtect
Publisher:         ISS
Operating System:  Windows
                   UNIX variants
                   Linux variants
                   Novell NetWare
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated

Original Bulletin: http://xforce.iss.net/xforce/alerts/id/189

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Internet Security Systems Protection Advisory
February 24, 2005

Trend Micro AntiVirus Library Heap Overflow

Summary:

ISS has shipped protection for a flaw X-Force has discovered in Trend Micro 
AntiVirus Library. The Trend Micro AntiVirus Library is widely relied upon 
to provide antivirus capabilities to desktop, server, and gateway systems. 
Also, several large vendors and ISP's implement Trend Micro's AntiVirus 
Library in their products. By crafting an ARJ file, an attacker is able to 
trigger a heap overflow within the process importing the Trend Micro 
AntiVirus Library.

ISS Protection Strategy:

ISS has provided preemptive protection for these vulnerabilities. We 
recommend that all customers apply applicable ISS product updates. 

Network Sensor 7.0, Proventia A and G:
 XPU 24.2 / 2/8/05
ARJ_Long_FileName_Detected

Proventia M:
 XPU 1.41 / 2/8/05
ARJ_Long_FileName_Detected

Server Sensor 7.0:
 XPU 24.2 / 2/8/05
ARJ_Long_FileName_Detected

Desktop Protector 7.0:
 Version EOA / 2/8/05
ARJ_Long_FileName_Detected

BlackICE Agent for Server 3.6:
 Version EOA / 2/8/05
ARJ_Long_FileName_Detected

These updates are now available from the ISS Download Center at:
http://www.iss.net/download.

Business Impact:

Compromise of antivirus protected networks and machines may lead to 
exposure of confidential information, loss of productivity, and 
further network compromise. Successful exploitation of this 
vulnerability could be used to gain unauthorized access to networks 
and machines being protected by Trend Micro AntiVirus Library product. 
Implementations of Trend Micro AntiVirus Library are likely vulnerable 
through common protocols, e.g. SMTP, HTTP, FTP. No authentication is 
required for an attacker to leverage this vulnerability to compromise 
an antivirus protected network or machine. It is likely Trend Micro 
AntiVirus Library implementations are vulnerable in their default 
configurations.

Affected Products:

Trend Micro Client / Server / Messaging Suite for SMB for Windows
Trend Micro Client / Server Suite for SMB for Windows
Trend Micro InterScan eManager
Trend Micro InterScan Messaging Security Suite for Linux
Trend Micro InterScan Messaging Security Suite for Windows
Trend Micro InterScan Messaging Security Suite for Solaris
Trend Micro InterScan VirusWall for Linux
Trend Micro InterScan VirusWall for Windows
Trend Micro InterScan VirusWall for HP-UX
Trend Micro InterScan VirusWall for AIX
Trend Micro InterScan VirusWall for Solaris
Trend Micro InterScan VirusWall for SMB
Trend Micro InterScan Web Security Suite for Linux
Trend Micro InterScan Web Security Suite for Windows
Trend Micro InterScan Web Security Suite for Solaris
Trend Micro InterScan WebManager
Trend Micro InterScan WebProtect for ISA
Trend Micro OfficeScan Corp. Edition
Trend Micro PC-cillin Internet Security
Trend Micro PortalProtect for SharePoint
Trend Micro ScanMail eManager
Trend Micro ScanMail for Lotus Domino on Windows
Trend Micro ScanMail for Lotus Domino on AS/400
Trend Micro ScanMail for Lotus Domino on S/390
Trend Micro ScanMail for Lotus Domino on AIX
Trend Micro ScanMail for Lotus Domino on Solaris
Trend Micro ScanMail for Microsoft Exchange
Trend Micro ServerProtect for Linux
Trend Micro ServerProtect for Windows / Novell Netware on Windows
Trend Micro ServerProtect for Windows / Novell Netware on Netware

Note: Additional versions may be affected, please contact your 
vendor for confirmation. In addition, several ISPs and vendors 
also use Trend Micro AntiVirus Library and are likely vulnerable.

Description:

Trend Micro Antivirus Library is used to parse different file 
formats to detect malware. One of the modules in Trend Micro 
Antivirus Library parses the ARJ file format. Before ARJ 
decompression, the library does not properly check the length of 
main and local header file names. This file name is copied into a 
heap buffer with a file name member allotted 0x200 bytes. While 
the overall heap chunk is allocated enough space for this buffer, 
there are various pointers in the structure that the attacker may 
overwrite in order to gain control with immediate context. The 
result is a non-standard arbitrary heap overflow with moderate 
character restrictions.

This vulnerability can be triggered by an unauthenticated remote 
attacker, without user interaction, by sending an e-mail containing 
a crafted ARJ file to the target Trend Micro AntiVirus Library on 
client, server, and gateway implementations. Additional attack 
vectors exist over other common protocols (e.g. HTTP, FTP, POP3), 
but some may require user interaction. 

The ISS X-Press Updates detailed above have the ability to protect 
against attack attempts targeted at Trend Micro products.

Additional Information:

Trend Micro Advisory:
http://www.trendmicro.com/vinfo/secadvisories/default6.asp?VName=Vulnerability+in+VSAPI+ARJ+parsing+could+allow+Remote+Code+execution



Credit:

This vulnerability was discovered and researched by Alex Wheeler 
of the ISS X-Force.

______

About Internet Security Systems (ISS)
Internet Security Systems, Inc. (ISS) is the trusted security expert to
global enterprises and world governments, providing products and services
that protect against Internet threats. An established world leader
in security since 1994, ISS delivers proven cost efficiencies and
reduces regulatory and business risk across the enterprise for
more than 11,000 customers worldwide. ISS products and services
are based on the proactive security intelligence conducted by ISSÂ’
X-Force® research and development team – the unequivocal world
authority in vulnerability and threat research. Headquartered
in Atlanta, Internet Security Systems has additional operations
throughout the Americas, Asia, Australia, Europe and the Middle East.

Copyright (c) 2005 Internet Security Systems, Inc. All rights reserved
worldwide.

This document is not to be edited or altered in any way without the
express written consent of Internet Security Systems, Inc. If you wish
to reprint the whole or any part of this document, please email

xforce@iss.net for permission. You may provide links to this document
from your web site, and you may make copies of this document in
accordance with the fair use doctrine of the U.S. copyright laws. 

Disclaimer: The information within this document may change without notice.
Use of this information constitutes acceptance for use in an AS IS
condition. There are NO warranties, implied or otherwise, with regard to
this information or its use. Any use of this information is at the
user's risk. In no event shall the author/distributor (Internet Security
Systems X-Force) be held liable for any damages whatsoever arising out
of or in connection with the use or spread of this information.

X-Force PGP Key available on MIT's PGP key server and PGP.com's key
server, as well as at http://www.iss.net/security_center/sensitive.php
Please send suggestions, updates, and comments to: X-Force

xforce@iss.net of Internet Security Systems, Inc.


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