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From: vogt at (
Subject: AW: How to easily bypass a firewall...

> Whereas if they were using, say, NetBSD with IPFilter and turned
> the securelevel to be >= 2, you cannot turn off or otherwise change
> ipf's configuration without a reboot.
> Of course this then leads back to the problem of having all the
> requisite bootup files immutable to prevent trojan'ing and that
> can make things harder to administer than it is worth the effort.

Actually, the main effect is that you NOTICE. Usually, you monitor
your systems, and a reboot will show up, which will cause you to
take a look.
Which raises the bar for the attacker from "not being noticed by
the OS" to "not being noticed by the admin looking for something
that's wrong".


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