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Set Password Expiring Warning Days The PASS_WARN_AGE parameter in /etc/login.defs allows an administrator to notify users that their password will expire in a defined number of days. It is recommended that the PASS_WARN_AGE parameter be set to 7 or more days.

Disable System Accounts There are a number of accounts provided with Ubuntu that are used to manage applications and are not intended to provide an interactive shell.

Set Default umask for Users The default umask determines the permissions of files created by users. The user creating the file has the discretion of making their files and directories readable by others via the chmod command. Users who wish to allow their files and directories to be readable by others by default may choose a different default umask by inserting the umask command into the standard ...

Lock Inactive User Accounts User accounts that have been inactive for over a given period of time can be automatically disabled. It is recommended that accounts that are inactive for 35 or more days be disabled.

Verify Permissions on /etc/passwd The /etc/passwd file contains user account information that is used by many system utilities and therefore must be readable for these utilities to operate.

Verify Permissions on /etc/shadow The /etc/shadow file is used to store the information about user accounts that is critical to the security of those accounts, such as the hashed password and other security information.

Verify Permissions on /etc/group The /etc/group file contains a list of all the valid groups defined in the system. The command below allows read/write access for root and read access for everyone else.

Verify User/Group Ownership on /etc/passwd The /etc/passwd file contains a list of all the valid userIDs defined in the system, but not the passwords. The command below sets the owner and group of the file to root.

Verify User/Group Ownership on /etc/shadow The /etc/shadow file contains the one-way cipher text passwords for each user defined in the /etc/passwd file. The command below sets the user and group ownership of the file to root.

Verify User/Group Ownership on /etc/group The /etc/group file contains a list of all the valid groups defined in the system. The command below allows read/write access for root and read access for everyone else.


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