cis-ubuntu1604-v200-4-1-8

name	cis-ubuntu1604-v200-4-1-8
description	Ensure session initiation information is collected
category	cis-logging
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","auditd","logging"]
cis_id	4.1.8
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.1.8

Profile

• Level: 2 - Server
• Level: 2 - Workstation
• Assessment Status: Automated

Description

Monitor session initiation events. The parameters in this section track changes to the files associated with session events. The file /var/run/utmp tracks all currently logged in users. All audit records will be tagged with the identifier "session." The /var/log/wtmp file tracks logins, logouts, shutdown, and reboot events. The file /var/log/btmp keeps track of failed login attempts and can be read by entering the command /usr/bin/last -f /var/log/btmp. All audit records will be tagged with the identifier "logins."

Note:

• The last command can be used to read /var/log/wtmp (last with no parameters) and /var/run/utmp (last -f /var/run/utmp)
• Reloading the auditd config to set active settings requires the auditd service to be restarted, and may require a system reboot.

Rationale

Monitoring these files for changes could alert a system administrator to logins occurring at unusual hours, which could indicate intruder activity (i.e. a user logging in at a time when they do not normally log in).

Impact

None.

Audit Procedure

Command Line

Run the following command to verify the rules are contained in a .rules file in the /etc/audit/rules.d/ directory:

grep -E '(session|logins)' /etc/audit/rules.d/*.rules

Verify output includes:

-w /var/run/utmp -p wa -k session
-w /var/log/wtmp -p wa -k logins
-w /var/log/btmp -p wa -k logins

Run the following command to verify that rules are in the running auditd config:

auditctl -l | grep -E '(session|logins)'

Verify output includes:

-w /var/run/utmp -p wa -k session
-w /var/log/wtmp -p wa -k logins
-w /var/log/btmp -p wa -k logins

Expected Result

Output should include the rules listed above.

Remediation

Command Line

Edit or create a file in the /etc/audit/rules.d/ directory ending in .rules.

Example: vi /etc/audit/rules.d/50-session.rules

Add the following lines: