Date: Wed, 12 Sep 2007 08:33:28 -0500 From: Derek Ragona <derek@computinginnovations.com> To: Aldisa Admin <admin@aldisa.ca>, freebsd-questions@freebsd.org Subject: Re: Problem with logs Message-ID: <6.0.0.22.2.20070912083213.026faac0@mail.computinginnovations.com> In-Reply-To: <46E7E651.4010708@aldisa.ca> References: <46E7E651.4010708@aldisa.ca>
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At 08:14 AM 9/12/2007, Aldisa Admin wrote:
>Hello All,
>
>I am having trouble understanding what is going on and how to solve the
>problem:
>
>For the last few days, I am getting the following messages (some names
>removed for privacy) in the daily security run output:
>
>[hostname].ca login failures:
>Sep 11 10:36:52 server su: BAD SU abid to root on /dev/ttyp0
>
>[hostname].ca login failures:
>Sep 8 16:56:15 server su: BAD SU abid to root on /dev/ttyp0
>
>
>I got worried because both these instances are times when I am positive
>that I am not accessing the system. I am the only user of the system. I
>use ssh to access the system. Root access is disabled in sshd. I log in
>using my username (abid) and SU to root when necessary.
>
>So I went to check the auth.log, and here is the concerned section:
>
>Aug 31 17:01:36 server sshd[67613]: Accepted keyboard-interactive/pam for
>abid from 192.168.2.149 port 1203 ssh2
>Aug 31 17:01:40 server su: abid to root on /dev/ttyp0
>Aug 31 18:42:56 server sshd[69386]: Accepted keyboard-interactive/pam for
>abid from 192.168.2.149 port 1688 ssh2
>Aug 31 18:43:01 server su: abid to root on /dev/ttyp0
>Aug 31 22:58:28 server sshd[71423]: Accepted keyboard-interactive/pam for
>abid from 192.168.2.149 port 2032 ssh2
>Aug 31 22:58:32 server su: abid to root on /dev/ttyp0
>Sep 9 13:40:55 server sshd[72180]: Accepted keyboard-interactive/pam for
>abid from 192.168.2.149 port 4146 ssh2
>Sep 9 13:41:00 server su: abid to root on /dev/ttyp0
>Sep 9 14:14:09 server sshd[72484]: Accepted keyboard-interactive/pam for
>abid from 192.168.2.149 port 1116 ssh2
>Sep 10 09:04:41 server sshd[81232]: Accepted keyboard-interactive/pam for
>abid from 192.168.1.30 port 2599 ssh2
>Sep 10 09:04:47 server su: abid to root on /dev/ttyp0
>Sep 11 11:37:10 server sshd[94789]: Accepted keyboard-interactive/pam for
>abid from 192.168.1.30 port 1361 ssh2
>Sep 11 11:37:15 server su: abid to root on /dev/ttyp0
>Sep 12 08:41:46 server sshd[6247]: Accepted keyboard-interactive/pam for
>abid from 192.168.1.30 port 2521 ssh2
>Sep 12 08:41:53 server su: abid to root on /dev/ttyp0
>
>
>As you can see, there is no matching incidence in the auth.log. How can
>the security run show a BAD SU when there is no matching entry in the
>auth.log for somebody authenticating successfully under my username.
>
>Some other facts:
>
>The machine is behind a NAT router and only apache and email ports (25,
>80, 110, 143, 443, 587) are open. SSH access is restricted to intranet IP
>ranges.
How are you limiting this ssh access? Are you using hosts.allow? If you
are not using hosts.allow, I would suggest you do so.
-Derek
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