Ubuntu 22.04 LTS must disable automatic mounting of Universal Serial Bus (USB) mass storage driver.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260540	UBTU-22-291010	SV-260540r986276_rule		Medium

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

STIG	Date
Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-64269r953431_chk )
Verify Ubuntu 22.04 LTS disables ability to load the USB storage kernel module by using the following command: $ grep usb-storage /etc/modprobe.d/* \| grep "/bin/false" /etc/modprobe.d/stig.conf:install usb-storage /bin/false If the command does not return any output, or the line is commented out, this is a finding. Verify Ubuntu 22.04 LTS disables the ability to use USB mass storage device. $ grep usb-storage /etc/modprobe.d/* \| grep -i "blacklist" /etc/modprobe.d/stig.conf:blacklist usb-storage If the command does not return any output, or the line is commented out, this is a finding.

Check Text ( C-64269r953431_chk )

Verify Ubuntu 22.04 LTS disables ability to load the USB storage kernel module by using the following command:

$ grep usb-storage /etc/modprobe.d/* | grep "/bin/false"
/etc/modprobe.d/stig.conf:install usb-storage /bin/false

If the command does not return any output, or the line is commented out, this is a finding.

Verify Ubuntu 22.04 LTS disables the ability to use USB mass storage device.

$ grep usb-storage /etc/modprobe.d/* | grep -i "blacklist"
/etc/modprobe.d/stig.conf:blacklist usb-storage

If the command does not return any output, or the line is commented out, this is a finding.

Fix Text (F-64177r953432_fix)
Configure Ubuntu 22.04 LTS to disable using the USB storage kernel module. Create and/or append a custom file under "/etc/modprobe.d/" to contain the following: $ sudo su -c "echo install usb-storage /bin/false >> /etc/modprobe.d/stig.conf" Configure Ubuntu 22.04 LTS to disable the ability to use USB mass storage devices. $ sudo su -c "echo blacklist usb-storage >> /etc/modprobe.d/stig.conf"