Ubuntu 24.04 LTS must disable automatic mounting of Universal Serial Bus (USB) mass storage driver.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-270718	SRG-OS-000690-GPOS-00140	UBTU-24-300039	SV-270718r1067128_rule	2025-02-18	1

Description
Without authenticating 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. Satisfies: SRG-OS-000690-GPOS-00140, SRG-OS-000378-GPOS-00163

ℹ️ Check
Verify that Ubuntu 24.04 LTS disables ability to load the USB storage kernel module with the following command: $ sudo grep usb-storage /etc/modprobe.d/* \| grep "/bin/true" /etc/modprobe.d/DISASTIG.conf:install usb-storage /bin/true If the command does not return any output, or the line is commented out, this is a finding. Verify Ubuntu 24.04 LTS disables the ability to use USB mass storage device. $ sudo grep usb-storage /etc/modprobe.d/* \| grep -i "blacklist" /etc/modprobe.d/DISASTIG.conf:blacklist usb-storage If the command does not return any output, or the line is commented out, this is a finding.

ℹ️ Check

Verify that Ubuntu 24.04 LTS disables ability to load the USB storage kernel module with the following command: $ sudo grep usb-storage /etc/modprobe.d/* | grep "/bin/true" /etc/modprobe.d/DISASTIG.conf:install usb-storage /bin/true If the command does not return any output, or the line is commented out, this is a finding. Verify Ubuntu 24.04 LTS disables the ability to use USB mass storage device. $ sudo grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" /etc/modprobe.d/DISASTIG.conf:blacklist usb-storage If the command does not return any output, or the line is commented out, this is a finding.

✔️ Fix
Configure Ubuntu 24.04 LTS to disable using the USB storage kernel module with the following command: $ sudo su -c "echo install usb-storage /bin/true >> /etc/modprobe.d/DISASTIG.conf" Configure Ubuntu 24.04 LTS to disable the ability to use USB mass storage devices with the following command: $ sudo su -c "echo blacklist usb-storage >> /etc/modprobe.d/DISASTIG.conf"