Mapped to NIST 800-171 Requirement: 3.4.9
CMMC Assessment Objective: CM.L2-3.4.9[c]
What This Objective Means
While previous objectives (like CM.L2-3.4.9[a] and [b]) ask whether you’ve defined your software control strategy and are enforcing it, this part takes it a step further: you must prevent unauthorized software, firmware, or files from ever being loaded onto systems in the first place.
This includes:
• Blocking unauthorized installation of programs
• Preventing boot-level or firmware-level tampering
• Stopping unauthorized devices (USBs, external drives) from injecting code or data
This objective focuses on prevention at the point of execution or access, not just detection or policy.
Why It Matters
Allowing unapproved files or code into your systems:
• Creates backdoors for attackers
• Introduces compliance violations
• Increases malware and ransomware risk
• Enables insider threat actions without technical resistance
Security isn’t just about making a list of what you allow—it’s about making it impossible to load what you don’t.
How to Implement It
Use technical enforcement mechanisms that stop unauthorized software and firmware from being introduced or executed:
1. Application Control & Allowlisting
• Only permit software that matches defined publishers, paths, hashes, or signatures.
• Tools: Microsoft AppLocker, WDAC, JAMF, SentinelOne, CrowdStrike
2. Firmware Integrity Controls
• Implement Secure Boot and TPM to verify firmware authenticity on startup.
• Use BIOS/UEFI lockdown settings.
3. Endpoint Security Configurations
• Configure EDR or antivirus to block unapproved scripts, executables, or libraries.
4. Device Control
• Restrict use of USB ports and external devices unless explicitly authorized.
• Tools: GPO device control, EDR peripheral control, or dedicated device management tools.
5. Enforced Group Policies
• Block user install privileges.
• Prevent loading of executables from temporary paths or removable storage.
6. Monitor File Transfers and Mounts
• Enable restrictions for loading ISO, VHD, or script-based payloads from untrusted sources.
Evidence the Assessor Will Look For
Assessors will expect proof that technical mechanisms are actively preventing unauthorized loads:
• Screenshots of allowlist enforcement settings
• Logs showing blocked attempts to install or run unapproved executables
• Device control settings (USB disablement, policy-based media restrictions)
• Reports from EDR tools showing active prevention
• Boot-level security settings enforcing firmware validation
Common Gaps
• Allowlisting is defined but not enforced (audit mode only)
• Users retain local admin privileges to bypass restrictions
• USB ports enabled across all devices without control
• Firmware validation is not enabled or tested
• No logging of unauthorized install attempts
How Cuick Trac Helps
Cuick Trac supports this requirement by:
• Enforcing allowlisted software only within the secure enclave
• Disabling external device access where not explicitly approved
• Preventing firmware-level tampering through hardened boot controls
• Restricting software and file execution using pre-configured, locked-down endpoint settings
• Providing audit-ready logs that prove attempted unauthorized actions were blocked
Cuick Trac ensures that only trusted software and files ever make it into your CUI environment.
Final CTA
Unapproved software doesn’t belong in your environment.
Cuick Trac makes sure it never gets in.
Schedule a Cuick Trac demo and see how we block threats before they become risks.