Nutanix AOS must produce audit records containing information to establish what type of events occurred.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254164	NUTX-OS-000620	SV-254164r958412_rule		Medium

Description
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 the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.

Description

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 the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.

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

Details

Check Text ( C-57649r846578_chk )
Verify Nutanix AOS generates audit records when successful/unsuccessful attempts to use the following commands occur. Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": $ sudo auditctl -l \| grep -iw /usr/bin/su /etc/audit/audit.rules If the output is not -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding. $ sudo auditctl -l \| grep -iw /usr/bin/sudo /etc/audit/audit.rules If the output is not -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding. $ sudo grep -i "/etc/sudoers" /etc/audit/audit.rules If the output is not -w /etc/sudoers -p wa -k actions, this is a finding. $ sudo grep -i "/etc/sudoers.d/" /etc/audit/audit.rules If the output is not -w /etc/sudoers.d/ -p wa -k actions, this is a finding. $ sudo grep -i /usr/bin/newgrp /etc/audit/audit.rules If the output is not -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding. $ sudo grep -i /usr/bin/chsh /etc/audit/audit.rules If the output is not -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding.

Check Text ( C-57649r846578_chk )

Verify Nutanix AOS generates audit records when successful/unsuccessful attempts to use the following commands occur.

Check that the following system call is being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules":

$ sudo auditctl -l | grep -iw /usr/bin/su /etc/audit/audit.rules
If the output is not -a always,exit -F path=/usr/bin/su -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding.

$ sudo auditctl -l | grep -iw /usr/bin/sudo /etc/audit/audit.rules
If the output is not -a always,exit -F path=/usr/bin/sudo -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding.

$ sudo grep -i "/etc/sudoers" /etc/audit/audit.rules
If the output is not -w /etc/sudoers -p wa -k actions, this is a finding.

$ sudo grep -i "/etc/sudoers.d/" /etc/audit/audit.rules
If the output is not -w /etc/sudoers.d/ -p wa -k actions, this is a finding.

$ sudo grep -i /usr/bin/newgrp /etc/audit/audit.rules
If the output is not -a always,exit -F path=/usr/bin/newgrp -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding.

$ sudo grep -i /usr/bin/chsh /etc/audit/audit.rules
If the output is not -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged, this is a finding.

Fix Text (F-57600r846579_fix)
Configure the audit rules by running the following command: $ sudo salt-call state.sls security/CVM/auditCVM