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Passwd Infected Chkrootkit

Discussion in 'Security' started by k2tec, Nov 6, 2014.

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  1. k2tec

    k2tec Well-Known Member

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    After last update I have the following probleme on my VPS servers running.
    WHM 11.46.0 (build 12)
    Chkrootkit 0.50
    Checking `passwd'... INFECTED

    06-11-2014
    Before update
    This has come up after the last update.

    Is this a false positive?
     
    #1 k2tec, Nov 6, 2014
  2. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    It's very likely a false positive, however you may want to review your system for any additional signs of an exploit. Check the md5sum of the /bin/passwd file (it should be a symbolic link to /usr/local/cpanel/bin/jail_safe_passwd) to see if it matches up with what's provided by cPanel.

    Thank you.
     
    #2 cPanelMichael, Nov 6, 2014
  3. k2tec

    k2tec Well-Known Member

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    Thanks for the reply
    How do I check this to cpanels md5sum.txt
     
    #3 k2tec, Nov 6, 2014
    Last edited: Nov 7, 2014
  4. cPanelMichael

    cPanelMichael Forums Analyst
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    The checksum matches the file as provided by cPanel in an archived form at:

    Code:
    http://httpupdate.cpanel.net/cpanelsync/11.46.0.12/binaries/linux-c6-x86_64/bin/jail_safe_passwd.bz2
    Thank you.
     
    #4 cPanelMichael, Nov 6, 2014
  5. k2tec

    k2tec Well-Known Member

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    Okay they match, so it is a false positive.
    Thanks Michael.
     
    #5 k2tec, Nov 7, 2014
  6. zodiac9797

    zodiac9797 Member

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    I can see this warning on all of our dedicated servers since last update to WHM 11.46.0

    I quess it's a false warning. It is hard to believe that all of our servers were compromised on the same date. :)
     
    #6 zodiac9797, Nov 7, 2014
  7. mbressman

    mbressman Active Member

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    Same thing here - prior to 11/6 it wasn't showing 'passwd' as infected, and then all of a sudden on 11/6's nightly email and thereafter it started showing 'passwd' as infected. I have my WHM updates set to "RELEASE" and it seems likely that WHM updated itself right around then which could account for this, right? How can I check to see if that's when WHM performed it's update?

    Also - any ideas if CHKROOTKIT will be fixed/updated anytime soon to correct this?

    Thanks!
     
    #7 mbressman, Nov 12, 2014
  8. cPanelMichael

    cPanelMichael Forums Analyst
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    The cPanel update logs are stored in:

    /var/cpanel/updatelogs/

    Chkrootkit is a third-party application that's not developed by cPanel, so you may want to get in touch with it's developers or mailing list to report the issue.

    Thank you.
     
    #8 cPanelMichael, Nov 12, 2014
  9. cre8gr

    cre8gr Member

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    Hello,

    Today the VPS company I'm hosted said that some files were infected in my /tmp/webalizer and /tmp/awstats. After I run maldet I cleaned those files and I said let's see what chkrootkit will find and boom it said passwd INFECTED.

    I then ran md5sum and that's what I got for the /usr/local/cpanel/bin/jail_safe_passwd: 7ed882d987f8ad62f53d322091ae3241. Is this OK?

    - - - Updated - - -

    I forgot to mention my cPanel version is WHM 11.46.0 (build 21).
     
    #9 cre8gr, Dec 9, 2014
  10. cPanelMichael

    cPanelMichael Forums Analyst
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    Please post the output from the following command:

    Code:
    arch
    Thank you.
     
    #10 cPanelMichael, Dec 9, 2014
  11. cre8gr

    cre8gr Member

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    The output is: x86_64
     
    #11 cre8gr, Dec 10, 2014
  12. cPanelMichael

    cPanelMichael Forums Analyst
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    Yes, this matches the file from our update servers for your architecture. You can test this on your own in the future with commands such as:

    Code:
    mkdir /root/testing
cd /root/testing
wget http://httpupdate.cpanel.net/cpanelsync/11.46.0.22/binaries/linux-c6-x86_64/bin/jail_safe_passwd.bz2
bzip2 -d jail_safe_passwd.bz2
md5sum jail_safe_passwd
    Note the download URL will change depending on your version number, system architecture, and OS.

    Thank you.
     
    #12 cPanelMichael, Dec 10, 2014
  13. spyke01

    spyke01 Member

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    #13 spyke01, Aug 18, 2015
  14. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    What OS is installed on your server?

    Thank you.
     
    #14 cPanelMichael, Aug 18, 2015
  15. spyke01

    spyke01 Member

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    CENTOS 5.11 i686 standard the specifics from uname are:

     
    #15 spyke01, Aug 18, 2015
  16. cPanelMichael

    cPanelMichael Forums Analyst
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    You are using the wrong URL if CentOS 5 is installed on your system. The correct URL is:

    Code:
    http://httpupdate.cpanel.net/cpanelsync/11.50.1.1/binaries/linux-c5-i386/bin/jail_safe_passwd.bz2
    Thank you.
     
    #16 cPanelMichael, Aug 18, 2015
  17. spyke01

    spyke01 Member

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    Awesome thanks, looks like it was a false positive.
     
    #17 spyke01, Aug 18, 2015
  18. UHLHosting

    UHLHosting Well-Known Member

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    Twitter:
    root@panel [~/chkrootkit-0.50]# md5sum /bin/passwd
    792964343f6f916d8025bf9b1eb1e839 /bin/passwd
    root@panel [~/chkrootkit-0.50]# md5sum /usr/local/cpanel/bin/jail_safe_passwd
    f3b065b4354be16b83ecdef71da622b8 /usr/local/cpanel/bin/jail_safe_passwd
    root@panel [~/chkrootkit-0.50]#
     
    #18 UHLHosting, Jul 29, 2016
  19. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello,

    Could you elaborate on the context of this post? For instance, what issue are you attempting to address, or what particular information are you attempting to verify?

    Thank you.
     
    #19 cPanelMichael, Jul 29, 2016
  20. UHLHosting

    UHLHosting Well-Known Member

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    Twitter:
    If my passwd is infected, so as chkrootkit say it is.
     
    #20 UHLHosting, Jul 29, 2016
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