Ubuntu OS must require users to reauthenticate for privilege escalation or when changing roles.

Without reauthentication, users may access resources or perform tasks for which they do not have authorization.

When operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate.

Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158

Verify the "/etc/sudoers" file has no occurrences of "NOPASSWD" or "!authenticate" by using the following command:

     $ sudo grep -Ei '(nopasswd|!authenticate)' /etc/sudoers /etc/sudoers.d/* 

If any occurrences of "NOPASSWD" or "!authenticate" return from the command, this is a finding.

Remove any occurrence of "NOPASSWD" or "!authenticate" found in "/etc/sudoers" file or files in the "/etc/sudoers.d" directory.