RHEL 9 must be configured to disable USB mass storage.

Documentable No

Rule ID SV-258034r1051267_rule

CCI References

CCI-000778CCI-001958CCI-003959

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, SRG-OS-000480-GPOS-00227

Check Procedure

Verify that RHEL 9 disables the ability to load the USB Storage kernel module with the following command:

$ grep -r usb-storage /etc/modprobe.conf /etc/modprobe.d/* 

install usb-storage /bin/false
blacklist usb-storage

If the command does not return any output, or either 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.

Fix Action

To configure the system to prevent the usb-storage kernel module from being loaded, add the following lines to the file "/etc/modprobe.d/usb-storage.conf" (or create "usb-storage.conf" if it does not exist):

install usb-storage /bin/false
blacklist usb-storage