Title

AIX must produce audit records containing information to establish what the date, time, and type of events that occurred. (Cat II impact)

Discussion

Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack. Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked. Associating event types with detected events in AIX audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system. Satisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000038-GPOS-00016

Check Content

Check if audit is turned on by running the following command: # audit query | grep -i auditing auditing on The command should yield the following output: auditing on If the command shows "auditing off", this is a finding. The log file can be set by the "trail" variable in /etc/security/audit/config. # grep trail /etc/security/audit/config trail = /audit/trail Note: The default log file is "/audit/trail". Use the following command to display the audit events: # /usr/sbin/auditpr -i <audit log file> -helRtcp event login status time command process --------------- -------- ----------- ------------------------ ------------------------------- -------- PROC_Delete root OK Wed Oct 31 23:01:37 2018 audit 9437656 FILE_Close root OK Wed Oct 31 23:01:37 2018 auditbin 12255562 FILE_Open root OK Wed Oct 31 23:01:37 2018 auditbin 12255562 FILE_Read root OK Wed Oct 31 23:01:37 2018 auditbin 12255562 FILE_Close root OK Wed Oct 31 23:01:37 2018 auditbin 12255562 PROC_Create root OK Wed Oct 31 23:01:44 2018 ksh 12976466 FILE_Close root OK Wed Oct 31 23:01:44 2018 ksh 9437658 FILE_Open root OK Wed Oct 31 23:01:44 2018 ksh 9437658 FILE_Read root OK Wed Oct 31 23:01:44 2018 ksh 9437658 FILE_Close root OK Wed Oct 31 23:01:44 2018 ksh 9437658 PROC_Execute root OK Wed Oct 31 23:01:44 2018 ls 9437658 FILE_Open root OK Wed Oct 31 23:01:44 2018 ls 9437658 If event type is not displayed, this is a finding. More information on the command options used above: -e the audit event. -l the login name of the user. -R the audit status. -t the time the record was written. -c the command name. -p the process ID.

Fix Text

Reset the audit system with the following command: # /usr/sbin/audit shutdown Start the audit system with the following command: # /usr/sbin/audit start

Additional Identifiers

Rule ID: SV-215236r508663_rule

Vulnerability ID: V-215236

Group Title: SRG-OS-000037-GPOS-00015

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.