4.1.9 Ensure session initiation information is collected - auditctl /var/log/btmp

Information

Monitor session initiation events. The parameters in this section track changes to the files associated with session events. The file /var/run/utmp file 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.'

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).

Solution

Add the following lines to the /etc/audit/audit.rules file:

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

Impact:

Auditing can produce a large amount of information, creating large and/or many audit log files.

Notes:

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 may require a system reboot.

See Also

https://workbench.cisecurity.org/files/2619

Item Details

Category: ACCESS CONTROL, AUDIT AND ACCOUNTABILITY

References: 800-53|AC-2(12), 800-53|AC-11, 800-53|AU-3, CSCv7|4.9, CSCv7|16.11, CSCv7|16.13

Plugin: Unix

Control ID: f9ff342b50ac661b0fc6514d035a0345fd0cf905f25b3619542b5084db9d1a19