Date: Mon, 28 Jul 1997 13:22:44 +0000 (GMT) From: "Jonathan A. Zdziarski" <jonz@netrail.net> To: Ollivier Robert <roberto@keltia.freenix.fr> Cc: security@FreeBSD.ORG Subject: Re: security hole in FreeBSD Message-ID: <Pine.BSF.3.95q.970728132145.4159A-100000@netrail.net> In-Reply-To: <19970728171633.10794@keltia.freenix.fr>
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I would check also /etc/inetd.conf to make sure he didn't set himself up with a root-environment on some port, I know finger -P will let you run for example a shell, and if it is set up as root, well... ------------------------------------------------------------------------- Jonathan A. Zdziarski NetRail Incorporated Server Engineering Manager 230 Peachtree St. Suite 500 jonz@netrail.net Atlanta, GA 30303 http://www.netrail.net (888) - NETRAIL ------------------------------------------------------------------------- On Mon, 28 Jul 1997, Ollivier Robert wrote: :According to Vincent Poy: :> 1) User on mercury machine complained about perl5 not working which was :> perl5.003 since libmalloc lib it was linked to was missing. :> 2) I recompiled the perl5 port from the ports tree and it's perl5.00403 :> and it works. : :I don't think he used perl to hack root unless you kept old versions of :Perl4 and Perl5. The buffer overflows in Perl4 were plugged in May by :Werner. 5.003+ holes are fixed in 5.004 and later. : :> 6) We went to inetd.conf and shut off all daemons except telnetd and :> rebooted and user still can get onto the machine invisibly. : :That shows that he has used a spare port to hook a root shell on. In these :case, "netstat -a" or "lsof -i:TCP" will give you all connections, :including those on which a program is LISTENing to. That way you'll catch :any process left on a port. : :-- :Ollivier ROBERT -=- FreeBSD: There are no limits -=- roberto@keltia.freenix.fr :FreeBSD keltia.freenix.fr 3.0-CURRENT #23: Sun Jul 20 18:10:34 CEST 1997 :
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