| name | cis-ubuntu1804-v220-4-3-5 |
| description | Ensure re-authentication for privilege escalation is not disabled globally |
| category | cis-iam |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","sudo","privilege-escalation"] |
| cis_id | 4.3.5 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 - Control 4.3.5
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
The operating system must be configured so that the !authenticate option is not used in /etc/sudoers or in any included sudoers file.
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 command to verify that !authenticate is not configured:
grep -r "!authenticate" /etc/sudoers /etc/sudoers.d/
Expected Result
Nothing should be returned. If output is returned, it means re-authentication has been disabled.
Remediation
Command Line
Remove any occurrences of !authenticate found in /etc/sudoers or files in /etc/sudoers.d/.
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 1 - Server
- Level 1 - Workstation
Assessment Status
Automated
