The Tanium Operating System (TanOS) must notify system administrators and ISSOs when accounts are removed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254858	TANS-OS-000725	SV-254858r866115_rule		Medium

Description
When operating system accounts are removed, user accessibility is affected. Accounts are utilized for identifying individual operating system users or for identifying the operating system processes themselves. Sending notification of account removal events to the system administrator and ISSO is one method for mitigating this risk. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

Description

When operating system accounts are removed, user accessibility is affected. Accounts are utilized for identifying individual operating system users or for identifying the operating system processes themselves. Sending notification of account removal events to the system administrator and ISSO is one method for mitigating this risk. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and also provides logging that can be used for forensic purposes. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access/auditing mechanisms that meet or exceed access control policy requirements.

STIG	Date
Tanium 7.x Operating System on TanOS Security Technical Implementation Guide	2022-10-31

Details

Check Text ( C-58471r866113_chk )
1. Access the TanOS interactively. 2. Press "A" for "Appliance Configuration Menu," and then press "Enter". 3. Press "4" for "Syslog Configuration," and then press "Enter". 4. Press "1" for "Check current status," and then press "Enter". If the syslog status page states "No existing TanOS syslog forwarding configuration found" this is a finding. If the syslog status page states "Syslog forwarding configuration" and the SIEM administrator verifies SIEM is receiving the events correctly and generating notifications for account removal events, this is not a finding.

Check Text ( C-58471r866113_chk )

1. Access the TanOS interactively.

2. Press "A" for "Appliance Configuration Menu," and then press "Enter".

3. Press "4" for "Syslog Configuration," and then press "Enter".

4. Press "1" for "Check current status," and then press "Enter".

If the syslog status page states "No existing TanOS syslog forwarding configuration found" this is a finding.

If the syslog status page states "Syslog forwarding configuration" and the SIEM administrator verifies SIEM is receiving the events correctly and generating notifications for account removal events, this is not a finding.

Fix Text (F-58415r866114_fix)
1. Access the TanOS interactively. 2. Press "A" for "Appliance Configuration Menu," and then press "Enter". 3. Press "4" for "Syslog Configuration," and then press "Enter". 4. Press "5" for "Configure syslog forwarding," and press then "Enter". 5. Enter the destination host (IP address or hostname) provided by the SIEM administrator, and then press "Enter". 6. Enter the destination port number and press "Enter". 7. If TLS is required for this syslog destination, enter "Yes", otherwise enter "No", and then press "Enter". 8. Enter the destination protocol, "udp" or "tcp", and press "Enter". 9. Work with the SIEM administrator to validate events are being received, and to configure notifications for account removal/deletion events.

Fix Text (F-58415r866114_fix)

1. Access the TanOS interactively.

2. Press "A" for "Appliance Configuration Menu," and then press "Enter".

3. Press "4" for "Syslog Configuration," and then press "Enter".

4. Press "5" for "Configure syslog forwarding," and press then "Enter".

5. Enter the destination host (IP address or hostname) provided by the SIEM administrator, and then press "Enter".

6. Enter the destination port number and press "Enter".

7. If TLS is required for this syslog destination, enter "Yes", otherwise enter "No", and then press "Enter".

8. Enter the destination protocol, "udp" or "tcp", and press "Enter".

9. Work with the SIEM administrator to validate events are being received, and to configure notifications for account removal/deletion events.