# NIST SP 800-53 Rev. 5 SI-3(8) — Detect Unauthorized Commands - Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/si-3-8-detect-unauthorized-commands - Section: [Compliance](https://support.icompaas.com/compliance) › [NIST SP 800-53 Rev. 5 Controls](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5) › SI — System and Information Integrity - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-53 Rev. 5**·Control `SI-3(8)`·critical·Component: **System and Information Integrity** ## What this control requires > Detect unauthorized operating system commands through the kernel application programming interface on the defined system hardware components. For detected unauthorized commands, take appropriate actions such as issuing a warning, auditing the command execution, or preventing the execution of the command. This control supports the Operating System Kernel capability within the System and Information Integrity family. > > — NIST SP 800-53 Rev. 5, Control SI-3(8) ### In plain English Detect unauthorized operating system commands through the kernel application programming interface on the defined system hardware components. In practice, this means you can prove you information actions-level controls on a defined cadence. ## Why it matters SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed. This control is rated **critical** in the source catalogue. Treat gaps here as production incidents in the risk register, not housekeeping. ## What an auditor looks for A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan. Within **System and Information Integrity**, the assessor will trace your implementation back to the catalogue reference (Control SI-3(8)) and look for objective evidence on the latest two assessment cycles. ## How to implement #### Endpoint Protection **MDM.** Make MDM enrollment a hard gate for device access (Intune compliance + Conditional Access, or Jamf + Okta device trust). Unmanaged devices simply don't get a session token. **EDR.** Deploy CrowdStrike / SentinelOne / Defender for Endpoint to every server and laptop; alert on any host that stops sending telemetry for >24h. ### Operational checklist - **Information.** Document the trigger, the owner and the cadence. - **Security.** Document the trigger, the owner and the cadence. - **Protection.** Document the trigger, the owner and the cadence. - **Hardware.** Document the trigger, the owner and the cadence. - **Unauthorized.** Document the trigger, the owner and the cadence. - **Scope:** actions, information, system, application, protection, hardware, components, capability. ## Evidence to collect - **User Device Scan.** MDM compliance state per user device (Intune / Jamf / Workspace ONE). Endpoint compliance telemetry (Intune, Jamf) proves managed coverage. Focus: Detect Unauthorized Commands. ## Common pitfalls - Pilot MDM rollouts that quietly exclude executives or engineers; carving out the highest-risk users is the most common audit failure. ## How it maps to other frameworks Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit. - [**ISO/IEC 27001:2022 A.8.10** — Information deletion](https://support.icompaas.com/compliance/iso-27001-2022/a-8-10-information-deletion) - [**NIST SP 800-171 Rev. 3 3.15.2** — System Security Plan](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-15-2-system-security-plan) ## Related controls in NIST SP 800-53 Rev. 5 - [**Control SI-4(13)** — Analyze Traffic And Event Patterns](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/si-4-13-analyze-traffic-and-event-patterns) - [**Control SA-17(2)** — Security-Relevant Components](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/sa-17-2-security-relevant-components) - [**Control PE-3(5)** — Tamper Protection](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/pe-3-5-tamper-protection) - [**Control SI-4(25)** — Optimize Network Traffic Analysis](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/si-4-25-optimize-network-traffic-analysis) - [**Control SI-4(23)** — Host-Based Devices](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/si-4-23-host-based-devices) - [**Control SI-7(1)** — Integrity Checks](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/si-7-1-integrity-checks) ## References - [NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5](https://csrc.nist.gov/Projects/risk-management/sp800-53-controls) - Catalogue identifier: `Control SI-3(8)` Topics: endpoint securityendpoint protection ## Related compliance guidance - [NIST SP 800-53 Rev. 5: a practical implementation guide for cloud teams](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5): Start with the full NIST SP 800-53 implementation guide — scope, roadmap, evidence and how the assessment runs. - [NIST SP 800-171 and CMMC: a practical guide to protecting CUI in the cloud](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3): If your obligation is protecting CUI in your own systems for a federal or defence contract, this derived subset — not the full catalogue — is the requirement. - [SOC 2 compliance: a practical implementation guide for cloud-native SaaS teams](https://support.icompaas.com/compliance/soc-2-trust-services-criteria): Most commercial SaaS already hold a SOC 2 Type 2, and FedRAMP 20x Class A is designed for providers that have one.