GEN:SID 1:2376
Message EXPLOIT ISAKMP first payload certificate request length overflow attempt
Summary This event is generated when an attempt is made to exploit a known
vulnerability in Checkpoint VPN-1.
Impact Unauthorized administrative access to Checkpoint VPN-1 systems
Detailed Information Checkpoint VPN-1, SecuRemote and SecureClient contain an error that
affects the processing of large Certificate requests to the VPN service.
By sending a large amount of data in the Certificate Request payload an
attacker may cause a buffer overflow condition to occur, presenting an
opportunity to execute code of their choosing with the privileges of the
user running the service, usually root.
Affected Systems CheckPoint Software FW-1 1.4.1 Service packs prior to SP6
    CheckPoint Software FW-1 Next Generation FP1, FP0
    CheckPoint Software VPN-1 1.4.1 SP5a
    CheckPoint Software VPN-1 Next Generation FP1, FP0
Attack Scenarios An attacker could supply a large Certificate Request payload containing
code to be executed on the system.
Ease of Attack Proof of concept code exists.
Corrective Action Upgrade to the latest non-affected version of the software

Apply the appropriate vendor supplied patches
Additional References  
Rule References bugtraq: 9582
cve: 2004-0040