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Thread: [SOLVED] Security concern - Found my PC at logon screen third day in row!

  1. #1
    Join Date
    Apr 2008
    Location
    Dulles, VA
    Beans
    392
    Distro
    Ubuntu 10.04 Lucid Lynx

    Exclamation [SOLVED] Security concern - Found my PC at logon screen third day in row!

    Hello guys,
    I have a desktop machine which i use at work with Ubuntu 8.04. I never turn it off when I go home but today is the third day I come to work and find the machine rebooted and at the logon screen. Nobody else has access to my office. I had 3D Cube screensafer enabled before and that caused it crash occasionally but it wouldn't reboot for that. That was awhile back. Now I just have a regular screen saver, no 3D stuff and before I leave everyday i Lock the screen.

    How can I find out what happened? I know it should be in the logs somewhere, but which ones?

    Thanks

  2. #2
    Join Date
    Apr 2008
    Location
    Dulles, VA
    Beans
    392
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Security concern - Found my PC at logon screen third day in row!

    No ideas? I though most people here know more than me about security and at least know which log and where to look!

    43 views and nobody, that's hard to believe.

  3. #3
    Join Date
    Aug 2005
    Location
    Boston, MA
    Beans
    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Security concern - Found my PC at logon screen third day in row!

    Well, there could be a couple of reasons why this is happening.

    1) Could be faulty hardware in the computer causing it to spontaneoulsy reboot.

    2) Maybe there are power problems in your office with the power going off or maybe the building is doing maintenance and shutting of the power to the building temporarily. Have you asked them if they turned off the power recently?

    3) Take a look in /var/log/messages

    Let us know what you find out

  4. #4
    Join Date
    Nov 2007
    Beans
    49

    Re: Security concern - Found my PC at logon screen third day in row!

    I've had issues with X randomly restarting before. If u restart X ( Ctrl+Alt+Backspace ) u are taken to ur login screen. That is also a possibility for what could have happened. Check in /var/log/Xorg.log.0

    Think that path is right.....

    Hope this helps.

  5. #5
    Join Date
    Jul 2007
    Beans
    154
    Distro
    Ubuntu 6.06 Dapper

    Re: Security concern - Found my PC at logon screen third day in row!

    Hi,


    To eliminate possible reboots as the cause check uptime, to see how long the systems been up.


    Also the Logs are you friend!!

    Regards,

    k_grdn

  6. #6
    Join Date
    Apr 2008
    Location
    Dulles, VA
    Beans
    392
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Security concern - Found my PC at logon screen third day in row!

    Thanks to all
    /var/log folder has all the information that i needed. I didnt find anything out of the ordinary in /var/log/messages so it could have been a power outtage. 3 days in a row is a little weird but it's a possibility, since one of those days we had a storm. Let's see what happens on Monday.

    BTW I set up a intrusion detection system using this how to :http://www.howtoforge.com/intrusion-...on-ubuntu-7.10

    It seems pretty good. I had some incomming UDP packets giving me ICMP alerts or something like that. Then I added that originating IP to the blocked in iptables so all packets comming from it are being dropped.

  7. #7
    Join Date
    Dec 2005
    Location
    Western Australia
    Beans
    11,480
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Security concern - Found my PC at logon screen third day in row!

    There's a possibility that the Compiz screensaver crashed X, delivering you back to the login screen.
    I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.

  8. #8
    Join Date
    Jun 2006
    Beans
    10

    Re: Security concern - Found my PC at logon screen third day in row!

    maybe there was some power cut

  9. #9
    Join Date
    Apr 2008
    Location
    Dulles, VA
    Beans
    392
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Security concern - Found my PC at logon screen third day in row!

    Well i come in on Monday and find the same thing. The computer is at login screen. I don't think they have a power outtages everyday. That's not possible. My 3D screensaver is disabled also. I just set he screen to go blank so no screensaver -period. This is so weird.

  10. #10
    Join Date
    Jul 2006
    Beans
    1,876
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Security concern - Found my PC at logon screen third day in row!

    Perhaps a janitor or security guard? Or mice chewing on the wires?
    Old As Dust.

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