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Subject: RE: BUG: crasher, pkcipe?
From: ewheeler,AT,kaico,DOT,com
Date: Tue, 15 Jan 2002 00:54:31 +0100
In-reply-to: <20020114081631.B13112@amavi.com>

As I understand the crash bug, it can be exploited from anywhere, and
because it is udp, spoofing the source would be trivial.

The quickest fix for the moment would be to use ipchains/tables to drop
packets destined to your machine on your CIPE ports which come from
anywhere but trusted sources.  Unfortunately, the sources can still be
spoofed, so it would have to be someone who knows what your trusted ip's
are in order to be successful in an attack.

iptables -A INPUT -j ACCEPT -s  x.x.x.x -p udp --destination-port xxx
iptables -A INPUT -j ACCEPT -s  x.x.x.x -p udp --destination-port xxx
iptables -A INPUT -j ACCEPT -s  x.x.x.x -p udp --destination-port xxx
iptables -A INPUT -j DROP -p udp --destination-port xxx

where xxx is your cipe port, and x.x.x.x are trusted ip's.

That should secure you a little bit :)


On Mon, 14 Jan 2002 chanlon-list,AT,gx,DOT,ca

> Does anyone have more details on the cipe bug.  Does a connection
> need to be established for the problem to occur?  Could the problem
> happen accidentally or would someone need to exploit it
> intentionally?
> Chris
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Eric Wheeler
Network Administrator
20417 SW 70th Ave.
Tualatin, OR 97062
Voice: 503.692.5268

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