Nutanix AOS must be configured to disable USB mass storage devices.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-254206	NUTX-OS-001210	SV-254206r958498_rule		Medium

Description
Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Peripherals include, but are not limited to, devices such as flash drives, external storage, and printers.

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

Details

Check Text ( C-57691r846704_chk )
Confirm Nutanix AOS is configured to disable USB mass storage devices. $ sudo grep -r usb-storage /etc/modprobe.d/* \| grep -i "/bin/true" \| grep -v "^#" install usb-storage /bin/true If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use USB mass storage devices. Determine if USB mass storage is disabled with the following command: $ sudo grep usb-storage /etc/modprobe.d/* \| grep -i "blacklist" \| grep -v "^#" blacklist usb-storage If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Check Text ( C-57691r846704_chk )

Confirm Nutanix AOS is configured to disable USB mass storage devices.

$ sudo grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/true" | grep -v "^#"
install usb-storage /bin/true

If the command does not return any output, or the line is commented out, and use of USB Storage is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Verify the operating system disables the ability to use USB mass storage devices.
Determine if USB mass storage is disabled with the following command:

$ sudo grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#"
blacklist usb-storage

If the command does not return any output or the output is not "blacklist usb-storage", and use of USB storage devices is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-57642r846705_fix)
Configure the system to disable USB mass storage and blacklist from executing by running the following command: $ sudo salt-call state.sls security/CVM/modprobeCVM