Nutanix AOS must automatically terminate a user session after inactivity time-outs have expired or at shutdown.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254122	NUTX-OS-000050	SV-254122r958636_rule		Medium

Description
Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections associated with communications sessions (i.e., network disconnect). A logical session (for local, network, and remote access) is initiated whenever a user (or process acting on behalf of a user) accesses an organizational information system. Such user sessions can be terminated (and thus terminate user access) without terminating network sessions. Session termination terminates all processes associated with a user's logical session except those processes that are specifically created by the user (i.e., session owner) to continue after the session is terminated. Conditions or trigger events requiring automatic session termination can include, for example, organization-defined periods of user inactivity, targeted responses to certain types of incidents, and time-of-day restrictions on information system use. This capability is typically reserved for specific operating system functionality where the system owner, data owner, or organization requires additional assurance. Satisfies: SRG-OS-000279-GPOS-00109, SRG-OS-000126-GPOS-00066, SRG-OS-000163-GPOS-00072

Description

Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections associated with communications sessions (i.e., network disconnect). A logical session (for local, network, and remote access) is initiated whenever a user (or process acting on behalf of a user) accesses an organizational information system. Such user sessions can be terminated (and thus terminate user access) without terminating network sessions. Session termination terminates all processes associated with a user's logical session except those processes that are specifically created by the user (i.e., session owner) to continue after the session is terminated. Conditions or trigger events requiring automatic session termination can include, for example, organization-defined periods of user inactivity, targeted responses to certain types of incidents, and time-of-day restrictions on information system use. This capability is typically reserved for specific operating system functionality where the system owner, data owner, or organization requires additional assurance. Satisfies: SRG-OS-000279-GPOS-00109, SRG-OS-000126-GPOS-00066, SRG-OS-000163-GPOS-00072

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

Details

Check Text ( C-57607r846452_chk )
Confirm Nutanix AOS is configured to auto disconnect remote session to prevent session hijacking. $ sudo grep -i clientalive /etc/ssh/sshd_config ClientAliveInterval 600 ClientAliveCountMax 0 If ClientAliveInterval is not "600" and ClientAliveCountMax is not "0", this is a finding.

Fix Text (F-57558r846453_fix)
Configure SSH to terminate remote sessions to prevent session hijacking by running the following command. $ sudo salt-call state.sls security/CVM/sshdCVM The SSH service will need to be restarted for the changes to take effect: $ sudo systemctl restart sshd