O-073: Check Point VPN-1 Server and VPN Client Buffer Overflow Vulnerability

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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

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

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medium excluding electronic media, please email xforce@iss.net for 
permission. 

Disclaimer: The information within this paper may change without notice. 
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condition. There are NO warranties, implied or otherwise, with regard to 
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Systems X-Force) be held liable for any damages whatsoever arising out 
of or in connection with the use or spread of this information. 
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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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