Nutanix AOS must implement DoD-approved encryption to protect the confidentiality of remote access sessions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254125	NUTX-OS-000080	SV-254125r958408_rule		High

Description
Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000125-GPOS-00065, SRG-OS-000424-GPOS-00188

Description

Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000125-GPOS-00065, SRG-OS-000424-GPOS-00188

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

Details

Check Text ( C-57610r846461_chk )
Inspect the "Ciphers" configuration with the following command: $ sudo grep -i ciphers /etc/ssh/sshd_config Ciphers aes256-ctr If any ciphers other than "aes256-ctr" are listed, the "Ciphers" keyword is missing, or the returned line is commented out, this is a finding.

Fix Text (F-57561r846462_fix)
Configure SSH to use only DoD approved ciphers 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