Title

RHEL 8 must be configured to disable USB mass storage. (Cat II impact)

Discussion

USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163

Check Content

Verify the operating system disables the ability to load the USB Storage kernel module. $ sudo grep -r usb-storage /etc/modprobe.d/* | grep -i "/bin/false" install usb-storage /bin/false 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. Check to see if USB mass storage is disabled with the following command: $ sudo grep usb-storage /etc/modprobe.d/* | grep -i "blacklist" 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 ISSO as an operational requirement, this is a finding.

Fix Text

Configure the operating system to disable the ability to use the USB Storage kernel module and the ability to use USB mass storage devices. Add or update the following lines in the file "/etc/modprobe.d/blacklist.conf": install usb-storage /bin/false blacklist usb-storage Reboot the system for the settings to take effect.

Additional Identifiers

Rule ID: SV-230503r942936_rule

Vulnerability ID: V-230503

Group Title: SRG-OS-000114-GPOS-00059

Expert Comments

CCIs tied to check.

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