__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Check Point ASN.1 VPN-1 Buffer Overrun [Check Point ASN.1 Alert of 7/28/04] July 28, 2004 21:00 GMT Number O-190 ______________________________________________________________________________ PROBLEM: An ASN.1 issue has been discovered affecting Check Point VPN-1 products during negotiations of a VPN tunnel. PLATFORM: VPN-1/FireWall-1 NG and above, VPN-1/FireWall-1 VSX NG with Application Intelligence, Provider-1 NG and above, FireWall-1 GX v2.0 and above DAMAGE: This may cause a buffer overrun, potentially compromising the gateway. In certain circumstances, this compromise could allow further network compromise. SOLUTION: Install the security update. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. A remote attacker may gain access to the VPN ASSESSMENT: without authentication. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/o-190.shtml ORIGINAL BULLETIN: http://www.checkpoint.com/techsupport/alerts/asn1.html ______________________________________________________________________________ [***** Start Check Point ASN.1 Alert of 7/28/04 *****] ASN.1 Alert 28 Jul 2004 An ASN.1 issue has been discovered affecting Check Point VPN-1 products during negotiations of a VPN tunnel which may cause a buffer overrun, potentially compromising the gateway. In certain circumstances, this compromise could allow further network compromise. Check Point Software customers who do not use Remote Access VPNs or gateway- to-gateway VPNs, or who have upgraded to current product versions (VPN-1/ FireWall-1 R55 HFA-08, R54 HFA-412, or VPN-1 SecuRemote/SecureClient R56 HF1) are NOT affected by this issue. A single packet attack is only possible if Aggressive Mode IKE is implemented. Check Point strongly discourages the use of Aggressive Mode IKE because it has inherent security limitations. When using IKE without enabling Aggressive Mode, the single packet attack is not possible, as the attacker must initiate a real IKE negotiation in order to perform the attack. The malformed IKE packet of this attack vector must be encrypted, which prevents detection of it using a signature. At the time of this alert, Check Point is not aware of any organizations that have been affected by this issue. However, in order to protect VPN-1 Gateways, Check Point recommends that customers install an update on all enforcement modules. The most recent Hotfix Accumulators (HFAs) and ASN.1 Hotfixes address this issue. Software Subscription customers can download updates for affected products using the links listed below. VPN-1/FireWall-1 NG with Application Intelligence R55W ASN.1 Hotfix IPSO | Linux | SecurePlatform | Solaris | Windows VPN-1/FireWall-1 NG with Application Intelligence R55 ASN.1 HF IPSO 3.8 | Linux 3.0 (RHEL 3.0) VPN-1/FireWall-1 NG with Application Intelligence R55 HFA-08 IPSO | Linux | SecurePlatform | Solaris | Windows VPN-1/FireWall-1 NG with Application Intelligence R54 HFA-412 IPSO | Linux | SecurePlatform | Solaris | Windows VPN-1/FireWall-1 Next Generation FP3 ASN.1 Hotfix IPSO | Linux | SecurePlatform | Solaris | Windows VPN-1 SecuRemote/SecureClient NG with Application Intelligence R56 HF-01 | R55 HFA-03 Provider-1 NG with Application Intelligence R55 HFA-08 Linux | SecurePlatform | Solaris Provider-1 NG with Application Intelligence R54 HFA-412 Solaris FireWall-1 GX 2.5 ASN.1 Hotfix IPSO | Linux | SecurePlatform | Solaris | Windows FireWall-1 GX 2.0 ASN.1 Hotfix IPSO | Linux | SecurePlatform | Solaris | Windows SSL Network Extender Linux | SecurePlatform | Solaris | Windows VPN-1/FireWall-1 VSX NG with Application Intelligence Release 2 ASN.1 Hotfix IPSO VPN-1/FireWall-1 VSX NG with Application Intelligence ASN.1 Hotfix SecurePlatform VPN-1/FireWall-1 VSX 2.0.1 ASN.1 Hotfix Linux | SecurePlatform Customers without a valid Software Subscription contract should contact Check Point Technical Support for assistance. [***** End Check Point ASN.1 Alert of 7/28/04 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Check Point for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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