bugtraq - TCP/IP implementations do not adequately validate ICMP error messages

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Message-ID: <4280CA6D.20602@ilionsecurity.ch>
Date: Tue, 10 May 2005 16:51:25 +0200
From: Alok Menghrajani - Ilion Security SA <alok@...onsecurity.ch>
To: bugtraq@...urityfocus.com
Subject: TCP/IP implementations do not adequately validate ICMP error messages


Hi,

I was playing around with the ICMP error messages DOS attack (I found an 
exploit on securityfocus.org 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,
Alok.

-- 
ILION Security S.A.
Network Audit by Ethical Hacking

M. Alok Menghrajani
alok@...onsecurity.ch

http://www.ilionsecurity.ch
36, av. Cardinal-Mermillod
CH-1227 Carouge/GE
Tél.: +41 22 343 99 33
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Fax:  +41 22 343 99 34