4.1.3.11 Ensure session initiation information is collected

Information

Monitor session initiation events. The parameters in this section track changes to the files associated with session events.

- /var/run/utmp - tracks all currently logged in users.
- /var/log/wtmp - file tracks logins, logouts, shutdown, and reboot events.
- /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 "session."

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).

Solution

Edit or create a file in the /etc/audit/rules.d/ directory, ending inrules extension, with the relevant rules to monitor session initiation information.

Example:

# printf "
-w /var/run/utmp -p wa -k session
-w /var/log/wtmp -p wa -k session
-w /var/log/btmp -p wa -k session
" >> /etc/audit/rules.d/50-session.rules

Merge and load the rules into active configuration:

# augenrules --load

Check if reboot is required.

# if [[ $(auditctl -s | grep "enabled") =~ "2" ]]; then printf "Reboot required to load rules
"; fi

See Also

https://workbench.cisecurity.org/files/3742