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From: amilabs at optonline.net (amilabs) Subject: How to easily bypass a firewall... 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@...ts.netsys.com [mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of Darren Reed Sent: Friday, August 01, 2003 12:54 PM To: Schmehl, Paul L Cc: full-disclosure@...ts.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 _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
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