AlmaLinux OS 9 must be configured to disable USB mass storage.

STIG ID: ALMA-09-031370  |  SRG: SRG-OS-000095-GPOS-00049 |  Severity: medium |  CCI: CCI-000381,CCI-001958,CCI-000778,CCI-003959 |  Vulnerability Id: V-269357

Vulnerability Discussion

USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity.

Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000378-GPOS-00163, SRG-OS-000114-GPOS-00059, SRG-OS-000690-GPOS-00140

Check

Verify that AlmaLinux OS 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/*

/etc/modprobe.d/usb-storage.conf:install usb-storage /bin/false
/etc/modprobe.d/usb-storage.conf:blacklist usb-storage

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.

Fix

To configure the system to prevent the usb-storage kernel module from being loaded, run the following command:

$ cat << EOF | tee /etc/modprobe.d/usb-storage.conf
install usb-storage /bin/false
blacklist usb-storage
EOF
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