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V-254150

CAT II (Medium)

Nutanix AOS must generate audit records when successful/unsuccessful attempts to access categories of information (e.g., classification levels) occur.

Rule ID

SV-254150r991571_rule

STIG

Nutanix AOS 5.20.x OS Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000172

Discussion

Without generating audit records that are 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).

Check Content

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

$ sudo grep -iw creat /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S creat -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S creat -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S creat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S creat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S creat -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S creat -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S creat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S creat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.

$ sudo grep -iw open /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S open -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S open -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S open -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S open -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S open -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S open -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S open -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
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 openat /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S openat -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S openat -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
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 open_by_handle_at /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S open_by_handle_at -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S open_by_handle_at -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S open_by_handle_at -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S open_by_handle_at -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S open_by_handle_at -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.

$ sudo grep -iw truncate /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S truncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S truncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
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 ftruncate /etc/audit/audit.rules
 -a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid=0 -k access.
 -a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid=0 -k access.
 -a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=4294967295 -k access.
 -a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=4294967295 -k access.
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

Configure the audit rules by running the following command:

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