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Category:   Application (VPN)  >   FireWall-1/VPN-1 Vendors:   Check Point
Check Point VPN-1 and SecuRemote/Secure Client ISAKMP Certificate Request Buffer Overflow Lets Remote Users Execute Arbitrary Code With SYSTEM/Root Privileges
SecurityTracker Alert ID:  1008948
SecurityTracker URL:
CVE Reference:   CVE-2004-0040   (Links to External Site)
Updated:  Feb 11 2004
Original Entry Date:  Feb 5 2004
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): VPN-1 Server 4.1 SP5 and prior versions; SecuRemote/SecureClient 4.1 build 4200 and prior versions; NG FP0 and NG FP1
Description:   A buffer overflow vulnerability was reported in the Check Point VPN-1 and SecuRemote/SecureClient version 4.1 software. A remote user can execute arbitrary code on the target system with SYSTEM or root level privileges.

Internet Security Systems (ISS) reported that there is a flaw in the processing of certain ISAKMP packets. A remote user can reportedly send large Certificate Request payloads during the initial Internet Key Exchange (IKE) negotiation to trigger a stack overflow. This flaw reportedly permits a remote user to execute arbitrary code on the target system.

ISS reported that VPN-1 SP6 and prior versions are affected. However, the vendor reports that VPN-1 SP5 and prior versions are affected. The vendor separately noted that VPN-1 NG FP0 and FP1 are affected.

Impact:   A remote user can execute arbitrary code on the target system with SYSTEM or root level privileges, depending on the target platform.
Solution:   The vendor reports that the flaw was fixed in Next Generation FP2, released in April 2002 and 4.1 SP6, released in June 2002.

[Editor's note: It appears that Check Point never issued a security alert for the affected products, until ISS disclosed the vulnerabilities.]

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (AIX), UNIX (HP/UX), UNIX (SGI/IRIX), UNIX (Solaris - SunOS), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  ISS Security Brief: Checkpoint VPN-1/SecureClient ISAKMP Buffer Overflow


Internet Security Systems Security Brief
February 4, 2004

Checkpoint VPN-1/SecureClient ISAKMP Buffer Overflow

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. 


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:


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 

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 for 

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's key server, 
as well as at 
Please send suggestions, updates, and comments to: X-Force of Internet Security Systems, Inc. 

Version: 2.6.2



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