Nutanix AOS 5.20.x OS STIG

Nutanix AOS 5.20.x OS Security Technical Implementation Guide

The Nutanix AOS 5.20.x OS Security Technical Implementation Guide (V1 R2) has 119 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V1 · R2

CurrentPublished Wed Jul 24 2024

Nutanix AOS must provide audit record generation capability for DoD-defined auditable events for directory and permissions management actions.

Nutanix AOS 5.20.x OS Security Technical Implementation Guide

Assessment Title

Rule Text

Nutanix AOS must provide audit record generation capability for DoD-defined auditable events for directory and permissions management actions.

Description

Discussion Text

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 is capable of generating audit records.

DoD has defined the list of events for which the operating system will provide an audit record generation capability as: 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.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-254138

Rule

SV-254138r958442_rule

Severity

medium

Rule Version

NUTX-OS-000310

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Confirm Nutanix AOS auditing is configured to generate audit records for all 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.

$ sudo grep -w "\-S mount" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S mount -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S mount -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S mount -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S mount -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w "rename" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S rename -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S rename -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S rename -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S rename -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w "renameat" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S renameat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S renameat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S renameat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S renameat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w "rmdir" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S rmdir -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S rmdir -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S rmdir -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S rmdir -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w "unlink" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S unlink -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S unlink -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S unlink -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S unlink -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w "unlinkat" /etc/audit/audit.rules
-a always,exit -F arch=b64 -S unlinkat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S unlinkat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S unlinkat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S unlinkat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w 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

$ sudo grep -w chmod /etc/audit/audit.rules
-a always,exit -F arch=b64 -S chmod -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S chmod -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S chmod -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S chmod -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w 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

$ sudo grep -w 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

$ sudo grep -w 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

$ sudo grep -w fchmodat /etc/audit/audit.rules
-a always,exit -F arch=b64 -S fchmodat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S fchmodat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S fchmodat -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S fchmodat -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

$ sudo grep -w fchmod /etc/audit/audit.rules
-a always,exit -F arch=b64 -S fchmod -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b64 -S fchmod -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S fchmod -F auid=0 -k audit_time_perm_mod_export_delete
-a always,exit -F arch=b32 -S fchmod -F auid>=1000 -F auid!=4294967295 -k audit_time_perm_mod_export_delete

If the command(s) does not return the appropriate response line, as indicated above, or if the line(s) is commented out, this is a finding.

Implementation Procedure

Fix Text

Configure the audit rules by running the following command.

$ sudo salt-call state.sls security/CVM/auditCVM

STIG check 19 of 119 in the Nutanix AOS 5.20.x OS STIG checklist

← Previous · V-254137Nutanix AOS must provide audit record generation capability for DoD-defined auditable events for system module management actions.Next · V-254139 →Nutanix AOS must provide audit record generation capability for DoD-defined auditable events for file management actions.