Date: Thu, 30 Aug 2007 22:22:39 +0200 From: Max Laier <max@love2party.net> To: freebsd-pf@freebsd.org Subject: Re: ping of death Message-ID: <200708302222.50629.max@love2party.net> In-Reply-To: <107702.63851.qm@web53701.mail.re2.yahoo.com> References: <107702.63851.qm@web53701.mail.re2.yahoo.com>
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On Thursday 30 August 2007, Lorenz Helleis wrote:
> Nessus give it to me:
>
> Mensagem:
> The machine crashed when pinged with an incorrectly fragmented packet.
> This is known as the 'jolt' or 'ping of death' denial of service
> attack.
>
> An attacker may use this flaw to shut down this server,
> thus preventing you from working properly.
>
> Solution : contact your operating system vendor for a patch.
>
> How can i fix this using pf ??
basic scrubbing will take care of the classic 'ping of death':
/* Respect maximum length */
if (fragoff + ip_len > IP_MAXPACKET) {
DPFPRINTF(("max packet %d\n", fragoff + ip_len));
goto bad;
}
so=20
scrub in on $ext_if=20
should keep you save.
=2D-=20
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