My fresh ISPConfig 3.0.1.1 installation keeps warning me with rkhunter. I receive a simple mail with this line: Please inspect this machine, because it can be infected No logfile to inspect so I ran rkhunter again: # rkhunter -c --createlogfile 2 warnings in the logfile: WARNING, found: /usr/share/man/man1/..1.gz (gzip compressed data, from Unix, max compression) /dev/.udev (directory) Warning: root login possible. Change for your safety the 'PermitRootLogin' I can fix the last warning but what about the first one?
Fixed it like this: https://bugzilla.redhat.com/show_bug.cgi?id=190248 When I run rkhunter, no more errors. However, I'm still receiving those mails.
I like to start this old topic again because I can't figure out what the problem is. Every hour at xx:53 there's a mail to root like this: Subject: [rkhunter] Warnings found for host@domain Please inspect this machine, because it can be infected I can't find any cron job that could cause this so the only way to reproduce this is, I guess, with the command #rkhunter -c --createlogfile, but I can't see any errors in the logfile.
It's empty: # ls -la /etc/cron.hourly/ totaal 24 drwxr-xr-x 2 root root 4096 apr 19 21:19 . drwxr-xr-x 103 root root 12288 apr 20 17:16 ..
rkhunter is run by the ispconfig monitoruing system and not by a crojob. Maybe you selected to receive an email as you installed rkhunter as I dont receive such emails on my servers.
I followed the perfect setup and forward all root mails to my mailbox. Strange thing I'm the only one with this issue. Could this be the cause: (I'm running CentOS 5.3) Rootkit Hunter 1.2.9 is running Determining OS... Unknown Warning: This operating system is not fully supported! All MD5 checks will be skipped! Or this: ClamAV update process started at Mon Apr 20 04:02:12 2009 WARNING: Your ClamAV installation is OUTDATED! WARNING: Local version: 0.94.2 Recommended version: 0.95.1 DON'T PANIC! Read http://www.clamav.net/support/faq main.cld is up to date (version: 50, sigs: 500667, f-level: 38, builder: sven) daily.cld is up to date (version: 9256, sigs: 41364, f-level: 42, builder: guitar)
Please inspect this machine, because it may be infected. Every hour i receive a message with text: Please inspect this machine, because it may be infected. why? no other warning in /var/log/rkhunter.log: Code: [00:02:12] System checks summary [00:02:12] ===================== [00:02:12] [00:02:12] File properties checks... [00:02:12] Files checked: 122 [00:02:12] Suspect files: 0 [00:02:12] [00:02:12] Rootkit checks... [00:02:12] Rootkits checked : 112 [00:02:12] Possible rootkits: 0 [00:02:12] [00:02:12] Applications checks... [00:02:12] Applications checked: 5 [00:02:12] Suspect applications: 0
Read the complete log file from RKhunter and not just the summary. Some line(s) will say something about the warning(s)
Thanks edge for your suggestion. In my log i've found: Checking for hidden processes [ Warning ] Warning: Hidden processes found: 30562 but maybe could be a false positive as stated in http://ubuntuforums.org/showthread.php?t=796192 infact i cannot cd in /proc/pid and if i execute rkhunter --check now no hidden process is reported. I've built the following script to test unhide (used by rkhunter to discovery hidden processes): Code: ps -ef > processes.txt unhide brute | grep 'Found HIDDEN PID' | while read line do #echo $line pid=`echo $line | awk '{ print $4 }'` echo echo Hidden PID: [$pid]; echo Testing dir "/proc/$pid" if [ -d "/proc/$pid" ]; then cat /proc/$pid/cmdline else echo "... Not Found (good)" fi echo Testing processes list pcregrep "\\w\\s+$pid" processes.txt done an this is a sample result: Code: Hidden PID: [20248] Testing dir /proc/20248 ... Not Found (good) Testing processes list postfix 20248 23453 0 10:30 ? 00:00:00 showq -t unix -u -c sometime the "hidden" process cannot be identified... but all seem to confirm the theory of false positive. I'd like to avoid it!
Is there some way to run it more spaced?, rkhunter is running every 30min and I get a 95% CPU Usage... can at least make it run every 2hs?
I have exactly the same issue with ispconfig3 and rk hunter with the same warnings. I uncommented the lines in rkhunter.conf that refer to the issues in the warnings but I still get the warnings and the emails every hour. I know how to stop the emails but I really want to stop the warning by fixing the problem Its a brand new centos5.3 server install using the howto from here on ispconfig3 and centos5.3. warning is same as others rkhunter.conf is as follows Code: # This is the configuration file of Rootkit Hunter. Please change # it to your needs. # # All lines beginning with a hash (#) or empty lines, will be ignored. # INSTALLDIR=/usr # Links to files. Don't change if you don't need to. LATESTVERSION=/rkhunter_latest.dat UPDATEFILEINFO=/rkhunter_fileinfo.dat # Send a warning message to the admin when one or more warnings # are available (rootkit and MD5 check). Note: uses default # commmand to send the warning message. MAIL-ON-WARNING=(my email address) # Use a custom temporary directory (you can override it with the # --tmpdir parameter) # Note: don't use /tmp as your temporary directory, because some # important files will be written to this directory. Be sure # you have setup your permissions very tight. TMPDIR=/var/rkhunter/tmp # Use a custom database directory (you can override it with the # --dbdir parameter) DBDIR=/var/rkhunter/db # Whitelist files (and their MD5 hash) # Usage: MD5WHITELIST=<binary>:<MD5 hash> #MD5WHITELIST=/bin/ps:9bd8bf260adc81d3a43a086fce6b430a #MD5WHITELIST=/bin/ps:404583a6b166c2f7ac1287445a9de6b3 # Allow direct root login via SSH # Don't use this option if you don't know what the warning about # this option means!! ALLOW_SSH_ROOT_USER=0 # Allow hidden directory # One directory per line (use multiple ALLOWHIDDENDIR lines) # #ALLOWHIDDENDIR=/etc/.java ALLOWHIDDENDIR=/dev/.udev #ALLOWHIDDENDIR=/dev/.udevdb #ALLOWHIDDENDIR=/dev/.udev.tdb #ALLOWHIDDENDIR=/dev/.static #ALLOWHIDDENDIR=/dev/.initramfs #ALLOWHIDDENDIR=/dev/.SRC-unix # Allow hidden file # One file per line (use multiple ALLOWHIDDENFILE lines) # #ALLOWHIDDENFILE=/etc/.java ALLOWHIDDENFILE=/usr/share/man/man1/..1.gz ALLOWHIDDENFILE=/etc/.pwd.lock #ALLOWHIDDENFILE=/etc/.init.state # Allow process to use deleted files # One process per line (use multiple ALLOWPROCDELFILE lines) # #ALLOWPROCDELFILE=/sbin/cardmgr #ALLOWPROCDELFILE=/usr/sbin/gpm #ALLOWPROCDELFILE=/usr/libexec/gconfd-2 #ALLOWPROCDELFILE=/usr/sbin/mysqld # Allow process to listen on any interface # One process per line (use multiple ALLOWPROCLISTEN lines) # #ALLOWPROCLISTEN=/sbin/dhclient #ALLOWPROCLISTEN=/usr/bin/dhcpcd #ALLOWPROCLISTEN=/usr/sbin/pppoe #ALLOWPROCLISTEN=/usr/sbin/tcpdump #ALLOWPROCLISTEN=/usr/sbin/snort-plain #ALLOWPROCLISTEN=/usr/local/bin/wpa_supplicant # The End edit: and the .hosts.swp file only as this in it Code: b0VIM 7.0{/CODE]
OK I sorted out one of the warnings by adding this line to rkhunter.conf Code: ALLOWHIDDENFILE=/etc/.hosts.swp I now just have one warning about root logins as follows and sshd_config has this Code: # Set this to 'yes' to enable PAM authentication, account processing, # and session processing. If this is enabled, PAM authentication will # be allowed through the ChallengeResponseAuthentication mechanism. # Depending on your PAM configuration, this may bypass the setting of # PasswordAuthentication, PermitEmptyPasswords, and # "PermitRootLogin without-password". If you just want the PAM account and # session checks to run without PAM authentication, then enable this but set # ChallengeResponseAuthentication=no #UsePAM no UsePAM yes what should this setting be I am assuming this is what is spitting out the error and sending me the email with the following quote
Ok finally happy after more searching around I have fixed all the issues. I had to modify sshd_conf and restart sshd I ran the rkhunter -c scan again it returned no warnings and this time I did not receive the email, meaning the hourly scan now will stop harrassing me by email unless there is a problem Thanks to you guys for some of the previous posts which did eventually give me clues as to sorting out what he underlying issue was, as searches on the warnings generally show up more confused souls lol
If my memory doesn't fails me, the .hosts.swp is a file that vi or vim create when hosts file is opened but if vi or vim unexpectedly closes this file remains, so if you remove it everything will be fine... I believe that some thing similar mus happen with .pwd.lock file. I definitely have to recommend you that don't add any hidden file unless of course you know what you are doing. About allowing or not root to login via ssh everybody has its tastes (if you have sudo/su you don't need root ssh access). But of course always have a very strong password for root (something like "xEw-Rki66;5vb4").
Hi ggarcia24 thanks for the reply do you think i should remove the "ALLOWHIDDENFILE=/etc/.hosts.swp" exception I put in rkhunter.conf for ".hosts.swp" and delete the "b0VIM 7.0" entry in the ".hosts.swp" to fix the warning error instead?
Yes, but don't remove the content, just remove the whole file... I'm sure that's a temporary file for VI
