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Check Point VPN-1 products contain boundary error in the ASN.1 decoding library

Vulnerability Note VU#435358

Original Release Date: 2004-08-02 | Last Revised: 2004-08-10


A vulnerability exists in Check Point's VPN-1 Server, which is included in many Check Point products. This vulnerability may permit a remote attacker to compromise the gateway system.


Check Point VPN-1 Server is a Virtual Private Network (VPN) application. A buffer overflow condition exists in an ASN.1 decoding library used by the VPN-1 software. This vulnerability could be exploited during the negotiation process of establishing a new VPN connection. To exploit this vulnerability, an attacker must initiate an IKE negotiation and then send a malformed IKE packet. The exploit packet must be encrypted, which prevents its detection by using a signature. However, if Aggressive Mode IKE is implemented, this vulnerability may be exploited via a single packet.

According to ISS X-Force's advisory, the following products are reported as vulnerable:

    • VPN-1/FireWall-1 NG with Application Intelligence R54
    • VPN-1/FireWall-1 NG with Application Intelligence R55
    • VPN-1/FireWall-1 NG with Application Intelligence R55W
    • VPN-1/FireWall-1 Next Generation FP3
    • VPN-1/FireWall-1 VSX FireWall-1 GX
    • VPN-1 SecuRemote/SecureClient All Versions

For more details, please see the Check Point security alert.


A remote attacker may be able to compromise the VPN gateway system.


Apply the appropriate patch from Check Point's security alert to address this issue.

Vendor Information


Check Point Affected

Updated:  August 02, 2004



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


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Thanks to Mark Dowd and Neel Mehta of the ISS X-Force for reporting this vulnerability.

This document was written by Jason A Rafail.

Other Information

CVE IDs: CVE-2004-0699
Severity Metric: 15.75
Date Public: 2004-07-28
Date First Published: 2004-08-02
Date Last Updated: 2004-08-10 14:41 UTC
Document Revision: 6

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