RE: How to easily bypass a firewall...

[amilabs <amilabs () optonline net>]

Wouldn't you rather reconfigure the ipchains to let yourself in
undetected whenever you wanted in a mild way?
Stopping the entire chains service will bring detection.

-----Original Message-----
From: full-disclosure-admin () lists netsys com
[mailto:full-disclosure-admin () lists netsys com] On Behalf Of Darren Reed
Sent: Friday, August 01, 2003 12:54 PM
To: Schmehl, Paul L
Cc: full-disclosure () lists netsys com
Subject: Re: [Full-disclosure] How to easily bypass a firewall...


In some mail from Schmehl, Paul L, sie said:
> If I break in to a Linux box, for example, all I have to do, once I 
> have root, is type: % /etc/rc.d/init.d/ipchains stop
>
> If it's a Windows box, I just kill the service:
> C:\ sc stop {firewall servicename}
>
> Or install the pstools to do it.
>
> The point is, once the box is owned, nothing else matters.

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.

Darren
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Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html