Re: CheckPoint FW1 BUG (fwd)

[bgreenbaum () SECURITYFOCUS COM (Ben Greenbaum)]

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
http://www.securityfocus.com

---------- Forwarded message ----------
Date: Fri, 7 Jul 2000 12:20:17 +0200
From: hugov <Hugo.Vazquez () add 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.

Sincerely,


--
Hugo Vázquez Caramés
Departamento Técnico de Sistemas
Seguridad Corporativa - Grupo ADD
mailto:Hugo.Vazquez () add es
Tel. +34.93.580.25.00
Fax. +34.93.580.28.93