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AUSCERT External Security Bulletin Redistribution
ESB-2004.0095 -- ISS Security Brief
Checkpoint VPN-1/SecureClient ISAKMP Buffer Overflow
05 February 2004
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AusCERT Security Bulletin Summary
---------------------------------
Product: Checkpoint VPN-1 Server 4.1 SP6 with OpenSSL
Hotfix and prior
Checkpoint SecuRemote/SecureClient 4.1 build 4200
and prior
Publisher: ISS
Operating System: Nokia IPSO
Linux
SecurePlatform
Solaris
Windows
Impact: Administrator/Root Compromise
Access Required: Remote
CVE Names: CAN-2004-0040
Comment: ISS X-Force bulletin:
http://xforce.iss.net/xforce/alerts/id/163
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Internet Security Systems Security Brief
February 4, 2004
Checkpoint VPN-1/SecureClient ISAKMP Buffer Overflow
Synopsis:
ISS X-Force has discovered a flaw in the ISAKMP processing for both the
Checkpoint VPN-1 server and Checkpoint VPN clients (Securemote/
SecureClient). These products collaborate to provide VPN access to
corporate networks for remote client computers. VPN-1 is the VPN component
commonly deployed on Checkpoint Firewall-1 installations. The IKE
component of these products allows for the unidirectional or bidirectional
authentication of two remote nodes as well as the negotiation of
cryptographic capabilities and keys. A buffer overflow vulnerability
exists when attempting to handle large certificate payloads.
Impact:
A remote attacker may exploit this flaw to remotely compromise any VPN-1
server and/or client system running SecureClient/SecureClient. X-Force has
developed functional exploit code for this vulnerability and has
demonstrated successful attacks using real-world scenarios. Successful
compromise of the VPN-1 server can lead directly to complete compromise of
the entire Checkpoint Firewall-1 server.
Remote attackers can leverage this attack to successfully compromise
heavily hardened networks by modifying or tampering with the firewall
rules and configuration. Attackers will be able to run commands under the
security context of the super-user, usually "SYSTEM", or "root". Any
properly configured Firewall-1 among the affected versions with VPN
support is vulnerable to this attack by default.
In addition, affected versions of VPN-1 SecureRemote / SecureClient are
vulnerable to complete remote compromise, expanding exposure to remote
VPN clients.
Affected Versions:
Checkpoint VPN-1 Server 4.1 up to and including SP6 with OpenSSL Hotfix
Checkpoint SecuRemote/SecureClient 4.1 up to and including build 4200
For the complete ISS X-Force Security Advisory, please visit:
http://xforce.iss.net/xforce/alerts/id/163
______
About Internet Security Systems (ISS)
Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a
pioneer and world leader in software and services that protect critical
online resources from an ever-changing spectrum of threats and misuse.
Internet Security Systems is headquartered in Atlanta, GA, with
additional operations throughout the Americas, Asia, Australia, Europe
and the Middle East.
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 xforce@iss.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
xforce@iss.net of Internet Security Systems, Inc.
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