cyberstrikeus CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 4.3.4
Profile Applicability
- Level 2 - Server
- Level 2 - Workstation
Description
The operating system must be configured so that users must provide a password for privilege escalation.
Rationale
Without re-authentication, 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 re-authenticate.
Audit Procedure
Command Line
Run the following commands to verify that no lines include NOPASSWD:
grep -r "NOPASSWD" /etc/sudoers /etc/sudoers.d/
Expected Result
Nothing should be returned. If output is returned, it means a user can execute sudo commands without a password.
Remediation
Command Line
Remove any line from /etc/sudoers or files in /etc/sudoers.d/ that include NOPASSWD.
Use visudo to edit the files:
visudo
visudo -f /etc/sudoers.d/<filename>
References
- NIST SP 800-53 Rev. 5: IA-11
CIS Controls
v8 - 5.4 Restrict Administrator Privileges to Dedicated Administrator Accounts.
v7 - 4.3 Ensure the Use of Dedicated Administrative Accounts.
Profile Applicability
- Level 2 - Server
- Level 2 - Workstation
Assessment Status
Automated