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Date: Tue, 10 May 2005 16:51:25 +0200
From: Alok Menghrajani - Ilion Security SA <>
Subject: TCP/IP implementations do not adequately validate ICMP error messages


I was playing around with the ICMP error messages DOS attack (I found an 
exploit on bid 13214), and I noticed the following 
work around:

when I add the following rule to iptables, the linux server (Kernel 
2.4.29-grsec) is no longer vulnerable to the DOS:
iptables -I INPUT 1 -p icmp -j DROP

I am interested in knowing if this work around makes any sense. Please 
keep me informed about this vulnerability.

Thank you,

ILION Security S.A.
Network Audit by Ethical Hacking

M. Alok Menghrajani
36, av. Cardinal-Mermillod
CH-1227 Carouge/GE
Tél.: +41 22 343 99 33
Mob.: +41 78 740 88 97
Fax:  +41 22 343 99 34

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