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Date: Sat, 25 Feb 2012 21:10:36 +0100
From: Yves-Alexis Perez <corsac@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: Attack on badly configured Netfilter-based
firewalls
On sam., 2012-02-25 at 19:37 +0100, Eric Leblond wrote:
> Impact:
> An attacker on a local network can open some pinholes in a firewall
> which is not correctly protected.
> Fix:
> None, the issue has to be fixed in the firewall configuration.
> Workaround:
> Apply a strict anti-spoofing policy for IPv4 and IPv6 as described in
> the document "Secure use of iptables and connection tracking helpers"
> This document was written after private disclosure of the attack to the
> Netfilter's team.
>
Did you check how the various frontends to iptables (ferm, ufw,
shorewall and the gazillon others)? They might generate an “insecure”
ruleset and might be candidate to a fix.
Regards,
--
Yves-Alexis
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