cis-ubuntu1804-v220-4-3-3

name	cis-ubuntu1804-v220-4-3-3
description	Ensure sudo log file exists
category	cis-iam
version	2.2.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-18.04","sudo","privilege-escalation"]
cis_id	4.3.3
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 4.3.3

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Description

sudo can use a custom log file.

Rationale

A sudo log file simplifies auditing of sudo commands.

Audit Procedure

Command Line

Run the following command to verify that sudo has a custom log file configured:

grep -rPsi '^\h*Defaults\h+([^#]+,\h*)?logfile\h*=\h*(")?[\/\w]+(")?' /etc/sudoers /etc/sudoers.d/

Expected Result

Defaults logfile="/var/log/sudo.log"

Remediation

Command Line

Edit the file /etc/sudoers or a file in /etc/sudoers.d/ with visudo and add the following line:

Defaults logfile="/var/log/sudo.log"

References

1. NIST SP 800-53 Rev. 5: AU-3, AU-12

CIS Controls

v8 - 8.5 Collect Detailed Audit Logs - Configure detailed audit logging for enterprise assets containing sensitive data.

v7 - 6.3 Enable Detailed Logging.

Profile Applicability

• Level 1 - Server
• Level 1 - Workstation

Assessment Status

Automated