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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0095 -- ISS Security Brief Checkpoint VPN-1/SecureClient ISAKMP Buffer Overflow 05 February 2004 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- 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. 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On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQCHHvyh9+71yA2DNAQEg8AP/cS+16GxKpgjHOJFqfpW8e7Tia7PGdmu3 l0KTdpabszH/fsS7JBOeXFBMa72JBsZf7H4VmoH7rtnEecO/mghx3zw031eUe86j K0YbYW/hZYMxCZjPEAbUCi+Cooxh/kQgZEPHBb5A0G48T+gPam3XErSyiIrlOzKY Ge6UNVxHZYo= =O4rG -----END PGP SIGNATURE-----