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Subject: Re: CheckPoint FW1 BUG (fwd)
From: Ben Greenbaum (bgreenbaumSECURITYFOCUS.COM)
Date: Fri Jul 07 2000 - 11:15:33 CDT

Forwarded to Bugtraq with permission of the author. Checkpoint has been
notified by Mr. Vasquez.

Can anyone else replicate this?

Ben Greenbaum
Director of Site Content
Security Focus

---------- Forwarded message ----------
Date: Fri, 7 Jul 2000 12:20:17 +0200
From: hugov <Hugo.Vazquezadd.es>
Subject: RE: CheckPoint FW1 BUG

Dear Sirs,

I think I have found a bug in CheckPoint Firewall-1.
That´s what I have noticed :

If you flood port 264 ( FW1_topo ) from your local network, the Firewall-1
CPU reaches 100% and nobody can connect with GUI ( neither on the firewall
itself ).

The test has been done on a local 10 MB Ethernet against a PII 266 256 MB,
FW1 4.1 SP1 in a NT 4.0 SP4 with the ippacket software and spoofing the
source IP, and that´s the packet sent :

destination IP : Firewall (external interface)
source IP : non existent IP ( on local net )
source port : 1000
destination port : 264
data : qwertyuiop1010101010
number of packets : -1 ( continuos mode )

Due to the importance of this port ( 264 ) in Securemote, etc... I think
It would be interesting to investigate how much this attack could danger
the system ( memory ) and comunications (smtp, VPN , Securemote...).

I have not tested from the Internet.


Hugo Vázquez Caramés
Departamento Técnico de Sistemas
Seguridad Corporativa - Grupo ADD
Tel. +34.93.580.25.00
Fax. +34.93.580.28.93