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             AUSCERT External Security Bulletin Redistribution

                   ESB-2005.0222 -- ISS Protection Brief
                  McAfee AntiVirus Library Stack Overflow
                               18 March 2005


        AusCERT Security Bulletin Summary

Product:           McAfee AntiVirus Library prior to version 4400
                   Active Virus Defense
                   Active VirusScan
                   Active Threat Protection
                   Active Mail Protection
                   GroupShield for Exchange
                   GroupShield for Lotus Domino
                   GroupShield for Mail Servers with ePO
                   NetShield for Netware
                   PortalShield for Microsoft SharePoint
                   SecurityShield for Microsoft ISA Server
                   VirusScan (all versions)
                   VirusScan(r) Enterprise(all versions)
                   WebShield Appliances
                   WebShield SMTP
Publisher:         ISS
Operating System:  Windows
                   Linux variants
                   Novell NetWare
Impact:            Administrator Compromise
                   Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated

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Internet Security Systems Protection Advisory
March 17, 2005

McAfee AntiVirus Library Stack Overflow


ISS has shipped protection for a flaw X-Force has discovered in McAfee 
AntiVirus Library versions prior to 4400. The McAfee AntiVirus Library 
is widely relied upon to provide antivirus capabilities to desktop, 
server, and gateway systems. Also, several large vendors and ISP's 
implement McAfee's AntiVirus Library in their products. By crafting an 
LHA file, an attacker is able to trigger a stack overflow within the 
process importing the McAfee 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 G100, G200, G1200:
 XPU 24.3 / 3/14/05

Proventia M and G400, G2000:
 XPU 1.42 / 3/14/05

Server Sensor 7.0:
 XPU 24.3 / 3/14/05

Desktop Protector 7.0:
Version EOB / 3/14/05

BlackICE Agent for Server 3.6:
Version EOB / 3/14/05

These updates are now available from the ISS Download Center at:

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 McAfee 
AntiVirus Library product. Implementations of McAfee AntiVirus Library are 
likely vulnerable through common protocols, e.g. SMTP, HTTP, FTP, SMB. No 
authentication is required for an attacker to leverage this vulnerability 
to compromise a antivirus protected network or machine. It is likely McAfee 
AntiVirus Library implementations are vulnerable in their default 

Affected Products:

Active Virus Defense
Active VirusScan
Active Virus Defense SMB Edition
Active VirusScan SMB Edition
Active Threat Protection
Active Mail Protection
GroupShield for Exchange
GroupShield for Exchange 5.5
GroupShield for Lotus Domino
GroupShield for Mail Servers with ePO
NetShield for Netware
PortalShield for Microsoft SharePoint
SecurityShield for Microsoft ISA Server
VirusScan (all versions)
VirusScan Professional
VirusScan ASaP/Managed VirusScan
VirusScan Command Line
VirusScan for NetApp
VirusScan(r) Enterprise(all versions)
WebShield Appliances
WebShield SMTP

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


McAfee Antivirus Library is used to parse different file formats to detect 
malware. One of the modules in McAfee Antivirus Library parses the LHA 
file format. Before LHA decompression, the library does not properly check 
the length of type 2 header file name fields. The LHA engine ensures the 
header field is no longer than 0x167 bytes, but has only allocated 0x130 
bytes of stack space when the copy takes place. In order to trigger the 
overflow, the LHA file must be malformed, and conform to another 
non-archive file format. By sending this malformed and dual format file, 
an attacker can execute arbitrary code in SYSTEM context across platforms 
in a reliable manner.

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

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


This vulnerability was discovered and researched by Alex Wheeler of 
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 ISS’
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

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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