Physical Hack Of My Server

Dec 9, 2007

Physical hack of my server?

My server (cent OS4, plesk 8) was frozen for a day and the NOC had to reboot it, here is the mail I got from my host:

>Your server was frozen, with a kernel panic. Ensure that you check your logs closely to determine how this happened,

After looking at the message log here is the part of the log when the crash happened:
Is this really a kernel panic, I am not sure...

Dec 8 09:05:36 server kernel: input: AT Translated Set 2 keyboard on isa0060/serio0
Dec 8 09:05:37 server hal.hotplug[2701]: DEVPATH is not set
Dec 8 09:05:37 server hal.hotplug[2702]: DEVPATH is not set
Dec 8 09:05:42 server login(pam_unix)[2670]: bad username [ ]
Dec 8 09:05:42 server login[2670]: Authentication started for user
Dec 8 09:05:44 server login[2670]: FAILED LOGIN 1 FROM (null) FOR , Authentication failure
Dec 8 09:05:50 server login(pam_unix)[2670]: authentication failure; logname=LOGIN uid=0 euid=0 tty=tty1 ruser= rhost= user=root
Dec 8 09:05:50 server login[2670]: Authentication started for user root
Dec 8 09:05:53 server login[2670]: FAILED LOGIN 2 FROM (null) FOR root, Authentication failure
Dec 8 09:05:57 server login(pam_unix)[2671]: authentication failure; logname=LOGIN uid=0 euid=0 tty=tty2 ruser= rhost= user=root
Dec 8 09:05:57 server login[2671]: Authentication started for user root
Dec 8 09:05:59 server login[2671]: FAILED LOGIN 1 FROM (null) FOR root, Authentication failure
Dec 8 09:06:00 server shutdown: shutting down for system reboot
Dec 8 09:06:00 server init: Switching to runlevel: 6
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
Dec 9 05:52:36 server syslogd 1.4.1: restart.

It looks to me like if someone has physically connected a keyboard and logged in at the NOC.

I use Iptable to restrict ssh access to my IP each time I connect remotly, so I dont' think a remote connection has been possible.

any idea about this line:
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@ ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
I think it's just corupted data the was written when the server shutt down.

Also i didn't find any other signes of kernel panic in the logs

Looking at the httpd error log I found this lines before the crash:

[Sat Dec 08 00:44:40 2007] [error] [client 213.215.41.138] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind
[Sat Dec 08 00:44:40 2007] [error] [client 213.215.41.138] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind

apparently somone doing server scan. maybe the 2 events are correlated and the server freeze could have been a result of some buffer overflow attack, but i sould be finding some evidences of this on the apache logs?

What direction should I take to investigate a bit further on this server freeze?

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top - 15:53:39 up 12 days, 3:16, 2 users, load average: 7.87, 10.30, 11.10
Tasks: 789 total, 3 running, 771 sleeping, 0 stopped, 15 zombie
Cpu(s): 20.4% us, 9.3% sy, 4.8% ni, 35.0% id, 30.1% wa, 0.4% hi, 0.0% si
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22488 root 27 12 3376 1352 508 R 16.8 0.1 12:08.63 rsync
15370 named 20 0 84020 30m 1936 S 4.2 1.5 20:15.72 named
16732 root 16 0 4684 1456 868 S 2.9 0.1 0:01.07 ftp
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26448 mailnull 17 0 9016 4088 2832 D 2.9 0.2 0:00.11 exim
26436 mailnull 16 0 0 0 0 Z 2.4 0.0 0:00.09 exim <defunct>
477 root 15 0 0 0 0 D 2.1 0.0 217:34.28 kjournald
26408 mailnull 16 0 8964 4584 3244 D 2.1 0.2 0:00.08 exim
26442 mailnull 16 0 0 0 0 Z 2.1 0.0 0:00.08 exim <defunct>
16975 root 15 0 4684 1444 856 S 1.6 0.1 0:00.56 ftp
23071 root 16 0 3760 1420 764 R 1.6 0.1 0:05.08 top
26477 root 16 0 8616 3892 2656 D 1.6 0.2 0:00.06 exim
26486 root 15 0 9420 3888 2656 D 1.3 0.2 0:00.05 exim
16694 root 15 0 4684 1436 848 S 1.0 0.1 0:00.63 ftp
16840 root 15 0 4684 1448 860 S 1.0 0.1 0:00.43 ftp
16865 root 15 0 4684 1444 856 S 1.0 0.1 0:00.72 ftp
16932 root 15 0 4684 1444 856 S 1.0 0.1 0:00.42 ftp
17275 root 15 0 4684 1448 860 S 1.0 0.1 0:00.57 ftp
26434 mailnull 16 0 8972 3956 2704 D 1.0 0.2 0:00.04 exim
26437 mailnull 15 0 8964 3920 2688 D 1.0 0.2 0:00.04 exim
26451 mailnull 15 0 8968 3932 2696 S 1.0 0.2 0:00.04 exim
26489 root 18 0 10568 3912 2656 S 1.0 0.2 0:00.04 exim
5310 root 15 0 40104 35m 1888 S 0.8 1.8 10:55.77 tailwatchd
16771 root 15 0 4684 1448 860 S 0.8 0.1 0:00.44 ftp
16779 root 15 0 4684 1448 860 S 0.8 0.1 0:00.56 ftp
16806 root 16 0 4684 1444 856 S 0.8 0.1 0:00.71 ftp
16844 root 15 0 4684 1440 852 S 0.8 0.1 0:00.57 ftp
16854 root 15 0 4684 1444 856 S 0.8 0.1 0:00.72 ftp
16857 root 15 0 4684 1444 856 S 0.8 0.1 0:00.63 ftp
16868 root 15 0 4684 1448 860 S 0.8 0.1 0:00.79 ftp
16885 root 15 0 4684 1448 860 S 0.8 0.1 0:00.68 ftp
16982 root 15 0 4684 1440 852 S 0.8 0.1 0:00.40 ftp
17008 root 16 0 4684 1448 860 S 0.8 0.1 0:00.69 ftp
17038 root 15 0 4684 1448 860 S 0.8 0.1 0:01.01 ftp
17082 root 15 0 4684 1448 860 S 0.8 0.1 0:00.71 ftp
17106 root 15 0 4684 1444 856 S 0.8 0.1 0:00.84 ftp
17288 root 16 0 4684 1448 860 S 0.8 0.1 0:00.69 ftp

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root pts/3 Apr 28 14:06 (x.x.x.x)

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[FONT='Verdana','sans-serif'][/FONT]
[FONT='Verdana','sans-serif']Being that I'm not a server admin and I rely on knownhost for server admin basics, am I out of line thinking that knownhost dropped the ball here? I mean is it obvious that a restart was in order after the first hack or is this just a bad chance scenario. Is the scenario they are describing plausible?[/FONT]

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So I'm a little bemused and stuck! How did someone piggyback on our site in this way?

The pages are indexed in Google so if you do a search for our company name and 'strip poker' then the link shows up in Google.

Does anyone have any idea what's going on? We own the URL, we don't believed our password has been compromised, the domain has not expired.

I think perhaps it's something to do with DHTML? We don't use it but all the bad pages do.

The links are not accessible from any of our pages (as for as I can see) but it's still a problem because they show up in Google.

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