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TCP/IP implementations do not adequately validate ICMP error messages

From: Alok Menghrajani - Ilion Security SA (alokilionsecurity.ch)
Date: Tue May 10 2005 - 09:51:25 CDT

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
alokilionsecurity.ch

http://www.ilionsecurity.ch
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CH-1227 Carouge/GE
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