Nutanix AOS must generate audit records when successful/unsuccessful accesses to objects occur.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254160	NUTX-OS-000570	SV-254160r991583_rule		Medium

Description
Without generating audit records specific to the security and mission needs of the organization, 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).

STIG	Date
Nutanix AOS 5.20.x OS Security Technical Implementation Guide	2024-06-18

Details

Check Text ( C-57645r846566_chk )
Confirm Nutanix AOS generates audit records on all successful/unsuccessful attempts to access privileges occur. $ sudo grep -iw chown /etc/audit/audit.rules -a always,exit -F arch=b64 -S chown -F auid=0 -k audit_time_perm_mod_export_delete -a always,exit -F arch=b64 -S chown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S chown -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S chown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. If the output does not contain all of the above rules, this is a finding. If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding. $ sudo grep -iw fchown /etc/audit/audit.rules -a always,exit -F arch=b64 -S fchown -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b64 -S fchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S fchown -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S fchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. -a exit,never -F arch=b64 -S openat -S open -S fchown -F success=0 -F uid=1000 -F exit=-13. -a exit,never -F arch=b64 -S fchown -F success=0 -F uid=0 -F exit=-13. If the output does not contain all of the above rules, this is a finding. If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding. $ sudo grep -iw lchown /etc/audit/audit.rules -a always,exit -F arch=b64 -S lchown -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S lchown -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. If the output does not contain all of the above rules, this is a finding. If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding. $ sudo grep -iw fchownat /etc/audit/audit.rules -a always,exit -F arch=b64 -S fchownat -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b64 -S fchownat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S fchownat -F auid=0 -k audit_time_perm_mod_export_delete. -a always,exit -F arch=b32 -S fchownat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete. If the output does not contain all of the above rules, this is a finding. If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding.

Check Text ( C-57645r846566_chk )

Confirm Nutanix AOS generates audit records on all successful/unsuccessful attempts to access privileges occur.

$ sudo grep -iw chown /etc/audit/audit.rules
-a always,exit -F arch=b64 -S chown -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S chown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S chown -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S chown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
If the output does not contain all of the above rules, this is a finding.
If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding.

$ sudo grep -iw fchown /etc/audit/audit.rules
-a always,exit -F arch=b64 -S fchown -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b64 -S fchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S fchown -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S fchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
-a exit,never -F arch=b64 -S openat -S open -S fchown -F success=0 -F uid=1000 -F exit=-13.
-a exit,never -F arch=b64 -S fchown -F success=0 -F uid=0 -F exit=-13.
If the output does not contain all of the above rules, this is a finding.
If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding.

$ sudo grep -iw lchown /etc/audit/audit.rules
-a always,exit -F arch=b64 -S lchown -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b64 -S lchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S lchown -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S lchown -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
If the output does not contain all of the above rules, this is a finding.
If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding.

$ sudo grep -iw fchownat /etc/audit/audit.rules
-a always,exit -F arch=b64 -S fchownat -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b64 -S fchownat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S fchownat -F auid=0 -k audit_time_perm_mod_export_delete.
-a always,exit -F arch=b32 -S fchownat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete.
If the output does not contain all of the above rules, this is a finding.
If both the "b32" and "b64" audit rules are not defined for the listed syscall(s), this is a finding.

Fix Text (F-57596r846567_fix)
Configure the audit rules by running the following command: $ sudo salt-call state.sls security/CVM/auditCVM