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Hide or display the sleep, restart, and shutdown buttons, in the login window. In loginwindow.plist, set the PowerOffDisabled key = true to hide the buttons. If the key does not exist, buttons are displayed.

Hide or display the restart button in the login window. In loginwindow.plist, set the RestartDisabled key = true to hide the buttons. If the key does not exist, the button is displayed.

The owner of bash 'init' files must be root. /etc/profile it is used to set system wide environmental variables on users shells. /etc/bashrc file is meant for setting command aliases and functions used by bash shell users. Use chown root /etc/bashrc /etc/profile to to change the owner as appropriate.

The group of bash 'init' files must be wheel. /etc/profile it is used to set system wide environmental variables on users shells. /etc/bashrc file is meant for setting command aliases and functions used by bash shell users. Use the command chgrp wheel /etc/bashrc /etc/profile to change group owner as appropriate.

The /etc/passwd file should not have an extended ACL. Use the chmod command to apply or remove the extended ACL permissions as appropriate.

Once an attacker establishes initial access to a system, the attacker often attempts to create a persistent method of re-establishing access. One way to accomplish this is for the attacker to create a new account. Auditing of account creation mitigates this risk. To address access requirements, many operating systems may be integrated with enterprise level authentication/access/auditing mechanisms ...

The SSH Version should be explicitly set to Version 2. Version 2 supports strong crypto and was rewritten from scratch to resolve several weaknesses in Version 1 that make it extremely vulnerable to attackers. The weaker crypto in Version 1 is potentially susceptible to certain forms of replay attacks. The system default is to only enable Version 2. A replay attack may enable an unauthorized user ...

Administrator users must never log in directly as root. To assure individual accountability and prevent unauthorized access, logging in as root over a remote connection must be disabled. Administrators should only run commands as root after first authenticating with their individual user names and passwords.

SSH should be configured to log users out after a 15 minute interval of inactivity and to only wait 30 seconds before timing out login attempts. Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminat ...

The root account must be the only account having a UID of 0. The built in root account is disabled by default and administrator users are required to use sudo to run a process with the UID '0'. If another account with UID '0' exists, this is a sign of a network intrusion or a malicious user that is attempting to circumvent security controls.


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