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Re: Attack on badly configured Netfilter-based firewalls
From: Yves-Alexis Perez <corsac () debian org>
Date: Sat, 25 Feb 2012 21:10:36 +0100

On sam., 2012-02-25 at 19:37 +0100, Eric Leblond wrote:
An attacker on a local network can open some pinholes in a firewall
which is not correctly protected.
None, the issue has to be fixed in the firewall configuration.
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.


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