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Date:      Mon, 01 Jul 1996 08:35:46 -0500
From:      Alex Nash <alex@fa.tdktca.com>
To:        Alexander Kolbasov <akolb@stins.msk.su>
Cc:        current@freefall.freebsd.org
Subject:   Re: IPFW bugs?
Message-ID:  <31D7D432.3D8895FF@fa.tdktca.com>
References:  <199606281933.MAA23688@freefall.freebsd.org> <199607011230.QAA21491@piglet.stins.msk.su>

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Alexander Kolbasov wrote:

> This rule actually means that anyone with root priviledges on his local host
> can access any port on your local net. The rule
> 
>  ipfw add pass all from any 123 to any via $1
> 
> is thus equivalent to
> 
>  ipfw add pass all from any to any via $1
> 
> and in fact it makes the firewall absolutely open. You should not trust any
> remote information, including port number!

ipfw in -current (rev 1.28) and -stable (rev 1.15.4.7) has been changed 
to reject a combination of the "all" protocol and a port number.

Alex



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