Article View: csu.unix.linux
Article #595Re: Linux security problems
From: Joshua Brauer
Date: Thu, 08 Apr 1999 00:00
Date: Thu, 08 Apr 1999 00:00
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Another place I think is worth checking out is the Abacus Project: http://www.psionic.com/abacus/ Having had a couple of Linux boxes hacked and modified I'd also look for other trojans. One of the boxes of mine that was hacked the person replaced most of the in.* files in /usr/sbin. With more than one box I was able to compare it to a safe install and do some manual recovery since I hadn't been running tripwire before then. Back to the Abacus Project: There is a nice little script called Sentry that listens to unused ports and then based on your instructions 1) adds an IP to hosts.deny and 2) adds a route to the loopback interface for that address. We even run it on some production machines and allow users that really need access to come explain why they were hitting unused ports. It has several different modes depending upon how tightly you want the system secured. Note there is a DOS attack possible if you use some UDP modes (this is documented in the docs but folks still report it as a bug). Josh
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1159f7,26ababda0a042db9 X-Google-Attributes: gid1159f7,public From: Joshua Brauer <joshb@vth.colostate.edu> Subject: Re: Linux security problems Date: 1999/04/08 Message-ID: <370CE375.21CA6A49@vth.colostate.edu> X-Deja-AN: 464096401 Content-Transfer-Encoding: 7bit References: <7ehhpv$dvnc@lamar.ColoState.EDU> <7eim7d$5c6k@yuma.ACNS.ColoState.EDU> X-Accept-Language: en Content-Type: text/plain; charset=us-ascii Organization: Colorado State University Vet Teaching Hospital Mime-Version: 1.0 Reply-To: joshb@vth.colostate.edu Newsgroups: csu.unix.linux