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[ISSForum] ISS Protection Brief: Checkpoint VPN-1 ASN.1 Decoding Remote Compromise


nternet Security Systems Protection Brief
July 28, 2004

Check Point VPN-1 ASN.1 Decoding Remote Compromise


ISS has shipped protection for a flaw X-Force has discovered in CheckPoint 
VPN-1 Server. The Check Point VPN-1 product is widely relied upon to 
provide secure remote access to private networks from less trusted network
environments. When establishing an encrypted connection to a virtual 
private network (VPN), it is possible for an attacker to trigger a buffer 
overflow vulnerability in an ASN.1 decoding library within the VPN-1 


The vulnerability described in this advisory is distinct and separate
frompreviously announced issues and customers are advised to assess
their protection accordingly.

Business Impact:

Compromise of VPN-1 networks 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 
being protected by Check Point?s VPN-1 product. No authentication would be 
required for an attacker to leverage this vulnerability to compromise a VPN,
and operational VPN-1 installations will likely be vulnerable in their
default configurations.

For the complete X-Force Protection Alert, please visit: 


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® 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) 2004 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@xxxxxxx 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 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

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: 
xforce@xxxxxxx of Internet Security Systems, Inc.

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