OL 9 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-271702	SRG-OS-000690-GPOS-00140	OL09-00-002332	SV-271702r1091818_rule	2025-05-08	1

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.

ℹ️ Check
Verify that OL 9 disables automatic mounting of the USB storage kernel module with the following command: $ grep usb-storage /etc/modprobe.d/* \| grep "/bin/true" install usb-storage /bin/true If the command does not return any output, or the line is commented out, this is a finding. Verify the operating system disables the ability to use USB mass storage device. $ grep usb-storage /etc/modprobe.d/* \| grep -i "blacklist" 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 OL 9 disables automatic mounting of the USB storage kernel module with the following command: $ grep usb-storage /etc/modprobe.d/* | grep "/bin/true" install usb-storage /bin/true If the command does not return any output, or the line is commented out, this is a finding. Verify the operating system disables the ability to use USB mass storage device. $ grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" blacklist usb-storage If the command does not return any output, or the line is commented out, this is a finding.

✔️ Fix
Configure OL 9 to disable using the USB storage kernel module. Create a file under "/etc/modprobe.d" to contain the following: # sudo su -c "echo install usb-storage /bin/true >> /etc/modprobe.d/DISASTIG.conf" Configure the operating system to disable the ability to use USB mass storage devices. # sudo su -c "echo blacklist usb-storage >> /etc/modprobe.d/DISASTIG.conf"