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                                 CERT-Renater

                      Note d'Information No. 2004/VULN126
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DATE                      : 19/03/2004

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running RealSecure, Proventia, BlackICE.
                            
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Internet Security Systems Security Brief
March 18, 2004

Vulnerability in ICQ Parsing in ISS Products    

Synopsis:

A vulnerability was discovered in the ICQ instant messaging protocol 
parsing routines of the ISS Protocol Analysis Module (PAM) component. 
The PAM module is a shared component of all current ISS host, server, 
and network protection software and devices. The flaw relates to 
incorrect parsing of the ICQ protocol which may lead to a buffer 
overflow condition.

Affected Versions:

RealSecure Network 7.0, XPU 22.11 and before
RealSecure Server Sensor 7.0 XPU 22.11 and before 
RealSecure Server Sensor 6.5 for Windows SR 3.10 and before 
Proventia A Series XPU 22.11 and before
Proventia G Series XPU 22.11 and before
Proventia M Series XPU 1.9 and before
RealSecure Desktop 7.0 ebl and before
RealSecure Desktop 3.6 ecf and before
RealSecure Guard 3.6 ecf and before 
RealSecure Sentry 3.6 ecf and before 
BlackICE Agent for Server 3.6 ecf and before
BlackICE PC Protection 3.6 ccf and before
BlackICE Server Protection 3.6 ccf and before

Updates are available from the ISS Download Center: http://www.iss.net/download/

Impact:

The vulnerability is caused by insufficient size checks on certain 
protocol fields in ICQ response data. After examining the nature of 
this vulnerability, ISS X-Force believes that exploitation of this 
issue is possible. It would not be necessary for ICQ response data to 
be part of a legitimate ICQ session to trigger this issue.

For the complete ISS X-Force Security Alert, please visit: http://xforce.iss.net/xforce/alerts/id/166

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About Internet Security Systems, Inc. 
Internet Security Systems, Inc. (ISS) is the trusted 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(R) research and development team - the 
u nequivocal 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. For more information, visit the Internet Security 
Systems Web site at www.iss.net or call 800-776-2362.

Copyright (c) 2004 Internet Security Systems, Inc. All rights reserved 
worldwide. 

Permission is hereby granted for the electronic redistribution of this 
document. It is not to be edited or altered in any way without the 
express written consent of the Internet Security Systems X-Force. If 
you wish to reprint the whole or any part of this document in any other 
medium excluding electronic media, please email xforceiss.net for 
permission. 

Disclaimer: The information within this paper 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 
xforceiss.net of Internet Security Systems, Inc. 

Internet Security Systems and Proventia are trademarks, and X-Force 
is a registered trademark of Internet Security Systems, Inc. Cobion 
is a registered trademark of Cobion AG. All other companies and 
products mentioned are trademarks and property of their respective 
owners. 

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