V-279549

Discussion

Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The list of audited events is the set of events for which audits are to be generated. This set of events is typically a subset of the list of all events for which the system can generate audit records. DOD has defined the list of events for which the operating system will provide an audit record generation capability as the following: 1) Successful and unsuccessful attempts to access, modify, or delete privileges, security objects, security levels, or categories of information (e.g., classification levels); 2) Access actions, such as successful and unsuccessful logon attempts, privileged activities or other system-level access, starting and ending time for user access to the system, concurrent logons from different workstations, successful and unsuccessful accesses to objects, all program initiations, and all direct access to the information system; 3) All account creations, modifications, disabling, and terminations; and 4) All kernel module load, unload, and restart actions. Satisfies: SRG-OS-000062-GPOS-00031, SRG-OS-000042-GPOS-00020, SRG-OS-000042-GPOS-00021

Check Content

Verify Nutanix OS generates full-text recording of privileged commands by running the following commands.

$ sudo grep -iw "postdrop" /etc/audit/audit.rules 
-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid=nutanix -F auid!=4294967295 -k privileged
-a always,exit -F path=/usr/sbin/postdrop -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged

 $ sudo grep -iw "unix_update" /etc/audit/audit.rules 
-a always,exit -F path=/usr/sbin/unix_update -F perm=x -F auid=nutanix -F auid!=unset -k privileged-unix-update
-a always,exit -F path=/usr/sbin/unix_update -F perm=x -F auid>=1000 -F auid!=unset -k privileged-unix-update

$ sudo grep -w "postqueue" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid=nutanix -F auid!=4294967295 -k privileged
-a always,exit -F path=/usr/sbin/postqueue -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged

$ sudo grep -w "semanage" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid=nutanix -F auid!=4294967295 -k secobjects
-a always,exit -F path=/usr/sbin/semanage -F perm=x -F auid>=1000 -F auid!=4294967295 -k secobjects

$ sudo grep -w "setfiles" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid=nutanix -F auid!=4294967295 -k privileged-priv_change
-a always,exit -F path=/usr/sbin/setfiles -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-priv_change

$ sudo grep -w "userhelper" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid=nutanix -F auid!=4294967295 -k privileged-passwd
-a always,exit -F path=/usr/sbin/userhelper -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd

$ sudo grep -w "setsebool" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid=nutanix -F auid!=4294967295 -k secobjects
-a always,exit -F path=/usr/sbin/setsebool -F perm=x -F auid>=1000 -F auid!=4294967295 -k secobjects

$ sudo grep -w "unix_chkpwd" /etc/audit/audit.rules
-a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid=nutanix -F auid!=4294967295 -k privileged
-a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged

If any of the audit rule commands does not return a line or the line is commented out, this is a finding.