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  1. #1
    Status
    Offline
      Rise Company
    Engineering and Technology
    Apr 2014
    Egypt
    4,000
    10

    whm SSH direct root logins are permitted - password authentication


    whm SSH direct root logins are permitted
    WHM Terminal and sshd-config setting PermitRootLogin to no
    PermitRootLogin to without-password or noWhat is the different?
    PermitRootLogin"without-password" vs "no"



    Security Advisor

    Manually edit /etc/ssh/sshd_config and change PermitRootLogin to without-password or no, then restart SSH in the Restart SSH area
    -------------------------------------------------------------
    direct root logins are permitted
    -------------------------------------------------------------

    A dictionary attack uses a brute-force technique of successively trying all the words in an exhaustive list called a dictionary (from a pre-arranged list of values). In contrast with a normal brute force attack, where a large proportion key space is searched systematically, a dictionary attack tries only those possibilities which are most likely to succeed, typically derived from a list of words for example a dictionary (hence the phase dictionary attack) or a bible etc. Generally, dictionary attacks succeed because many people have a tendency to choose passwords which are short (7 characters or fewer), single words found in dictionaries or simple, easily-predicted variations on words, such as appending a digit.

    If an attacker wants to break your server, he first needs to guess the username, and then try to gess the password for that username, so the more common dictionary attacks are done to the root password, there are two reasons to do it that way.

    1. Almost all systems has root accounts (Ubuntu does not have it enabled)
    2. If someone gain access to your server with the root accout it will have full access to the server


    -------------------------------------------------------------
    Root Account
    -------------------------------------------------------------
    So there are two simple ways to avoid the possibility of an attack to the root account
    PermitRootLogin to without-password or noWhat is the different?

    terminal

    :
    nano /etc/ssh/sshd_config
    PermitRootLogin yes yes
    without-password or no
    no



    -------------------------------------------------------------
    : PermitRootLogin without-password
    -------------------------------------------------------------
    : root
    Enable root access via ssh, but only with rsa key



    Edit the file /etc/ssh/sshd_config Look for this line
    #PermitRootLogin yes
    And change it to: PermitRootLogin without-password
    * #
    allows root, but *only* if keys are set up, or another form of authentication,'
    but *not* password authentication; - it will deny even a valid password.

    -------------------------------------------------------------
    : PermitRootLogin no
    -------------------------------------------------------------


    : root
    Disable root access via ssh to your server



    Edit the file /etc/ssh/sshd_config Look for this line
    #PermitRootLogin yes
    And change it to: PermitRootLogin no
    * #
    denies root all the time, even if keys have been set up for equivalence.

    -------------------------------------------------------------
    root Manage Wheel Group Users
    -------------------------------------------------------------



    : Terminal whm

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  2. #2
    Status
    Offline
      Rise Company
    Engineering and Technology
    Apr 2014
    Egypt
    4,000
    10

    : whm SSH direct root logins are permitted

    This is a common misunderstanding for the PermitRootLogin feature. The without-password option does not mean there is no authentication and anyone can get in without a password. All this option means is that logging in is only possible using a fallback method, such as public key authentication. Even if an attacker knows your root password, they will not be able to log in unless they have your private key.
    It is actually better to use without-password if you need to log in as root, since it ensures that the root account cannot be brute forced. If you were to log in as root with a password, it could be subject to being remotely attacked, whereas public key authentication ensures you can only log in with the proper credential files. This is better than logging in as a different user and using su to elevate to root, as a compromise of that other user would result in a compromised root, since the user can monitor any keystrokes entered into its shell. This is explained in detail in the answer to Which is the safest way to get root privileges: sudo, su or login?.

    If you do not need to have root, then using another, dedicated user would be fine. In this case, setting PermitRootLogin no would be beneficial, as there is no reason to have root access if not required.
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  3. #3
    Status
    Offline
      Rise Company
    Engineering and Technology
    Apr 2014
    Egypt
    4,000
    10

    : whm SSH direct root logins are permitted

    How to disable Direct Root Login in cpanel server

    First you need to add new admin user1,adduser admin
    2,passwd admin
    Please keep admin password
    3, vi /etc/group
    Make sure admin user wheel settings
    wheel:x:10:root,admin
    1. Copy and paste this line to edit the file for SSH logins
    vi /etc/ssh/sshd_config
    2. Find the line
    Protocol 2, 1
    3. Uncomment it and change it to look like
    Protocol 2
    4. Next, find the line
    PermitRootLogin yes
    5. Uncomment it and make it look like PermitRootLogin no
    6. Save the file Ctrl+X then Y then enter
    7. Now you can restart SSH
    /etc/rc.d/init.d/sshd restart
    SSH into your server as admin and gain root access by su
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