SV-270718r1134811: Ubuntu 24.04 LTS must disable automatic mounting of Universal Serial Bus (USB) mass storage driver. | Canonical Ubuntu 24.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

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

Description

Discussion Text

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

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-003959Not mappedCCI-001958

References

DPMS Target Canonical Ubuntu 24.04 LTS DISA DPMS Target Canonical Ubuntu 24.04 LTS 5673

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.ubuntu2404os:def:270718
# Ubuntu 24.04 LTS must disable automatic mounting of Universal Serial Bus (USB) mass storage driver.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/modprobe.d contains a file that contains 'install usb-storage /bin/false'
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -rqP --include='*' '^[ \t]*install[ \t]+usb-storage[ \t]+/bin/false[ \t]*$' '/etc/modprobe.d' &>/dev/null
}
# /etc/modprobe.d contains a file that contains 'blacklist usb-storage'
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^[ \t]*blacklist[ \t]+usb-storage[ \t]*$' '/etc/modprobe.d' &>/dev/null
}

if ( test_1 && test_2 ); then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# DISA STIG / SCAP compliance check for Ubuntu 24.04 LTS disabling automatic mounting of USB mass storage driver

if [ ! -d "/etc/modprobe.d" ]; then echo "PASS"; exit 0; fi
if [ ! -s "/etc/modprobe.d/DISASTIG.conf" ]; then echo "PASS"; exit 0; fi
if grep -q "^[ \t]*install[ \t]+usb-storage[ \t]+/bin/false[ \t]*$" /etc/modprobe.d/DISASTIG.conf && grep -q "^[ \t]*blacklist[ \t]+usb-storage[ \t]*$" /etc/modprobe.d/DISASTIG.conf; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

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/false >> /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"