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

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Message-ID: <MDEHLPKNGKAHNMBLJOLKKEDNDLAB.davids@webmaster.com>
Date: Tue, 10 May 2005 13:38:19 -0700
From: "David Schwartz" <davids@...master.com>
To: <bugtraq@...urityfocus.com>
Subject: RE: TCP/IP implementations do not adequately validate ICMP error messages



> 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.

	This breaks PMTU detection. ICMP is a host requirement, it is not optional.

	DS