# NIST SP 800-53 Rev. 5 AU-9(7) — Store On Component With Different Operating System - Source: https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-9-7-store-on-component-with-different-operating-system - 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) › AU — Audit and Accountability - Last updated: 2026-06-05 - Publisher: iCompaas, Inc. (https://www.icompaas.com) **NIST SP 800-53 Rev. 5**·Control `AU-9(7)`·high·Component: **Audit and Accountability** ## What this control requires > Stores audit information on a component running a different operating system than the audited system to reduce vulnerability-specific risks. This control supports the Separate OS Audit Storage capability within the Audit and Accountability family. > > — NIST SP 800-53 Rev. 5, Control AU-9(7) ### In plain English Stores audit information on a component running a different operating system than the audited system to reduce vulnerability-specific risks. In practice, this means you can prove you audit management-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 **high**. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation. ## 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 **Audit and Accountability**, the assessor will trace your implementation back to the catalogue reference (Control AU-9(7)) and look for objective evidence on the latest two assessment cycles. ## How to implement #### Cloud Posture **CSPM.** Run Wiz / Prisma / Defender for Cloud / Security Command Center over every account; auto-ticket findings above your accepted-risk threshold. #### Configuration Management **Policy-as-code.** Codify the control as Service Control Policies (AWS), Azure Policy initiatives, or Organisation Policy (GCP) so the platform enforces what the document promises. **IaC.** Gate Terraform / Pulumi / CloudFormation changes with Checkov / tfsec / OPA so misconfigurations never reach production. **Drift.** Run a CSPM (Wiz / Prisma / Defender for Cloud / Security Command Center) over every account and route findings to a single risk register. #### Network Security **AWS.** VPC Flow Logs to S3, default-deny security groups, AWS Network Firewall for north-south, and Transit Gateway for hub-and-spoke segmentation. **Azure.** NSGs with deny-by-default, Azure Firewall Premium with TLS inspection, Private Endpoints for PaaS, and Microsoft Defender for Cloud's secure score for drift. **GCP.** VPC Service Controls perimeters around sensitive APIs, Cloud NGFW Enterprise for L7 inspection, Private Service Connect for managed services. ### Operational checklist - **Audit.** Document the trigger, the owner and the cadence. - **Information.** Document the trigger, the owner and the cadence. - **Security.** Document the trigger, the owner and the cadence. - **Configuration.** Document the trigger, the owner and the cadence. - **Network.** Document the trigger, the owner and the cadence. - **Scope:** management, information, system, audit information, configuration, capability, accountability, storage. ## Evidence to collect - **Infra Scan.** Continuous infrastructure-posture telemetry — AWS Config, Azure Policy compliance, GCP Organisation Policy, Wiz / Prisma findings. Infrastructure posture tooling (AWS Config, Azure Policy, Nessus) verifies platform hardening. Focus: Store On Component With Different Operating System. ## Common pitfalls - Treating CSPM findings as a backlog instead of a hot queue: findings older than the policy SLA accumulate until the auditor asks why. - Manual cloud-console changes that never make it back to Terraform — drift accumulates until the next outage forces a reconciliation. - Default-allow egress rules; East-West traffic with no segmentation; jump hosts on the public internet with password auth. - Per-account logging that nobody stitches together at the org level — incidents that cross accounts go undetected for days. ## 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. - [**NIST SP 800-171 Rev. 3 3.4.6** — Least Functionality](https://support.icompaas.com/compliance/nist-sp-800-171-rev-3/3-4-6-least-functionality) - [**CIS Controls v8 8.3** — Ensure Adequate Audit Log Storage](https://support.icompaas.com/compliance/cis-controls-v8/8-3-ensure-adequate-audit-log-storage) - [**ISO/IEC 27001:2022 A.5.34** — Privacy and protection of personal identifiable information (PII)](https://support.icompaas.com/compliance/iso-27001-2022/a-5-34-privacy-and-protection-of-personal-identifiable-information-pii) - [**BSI C5:2020 OPS-14** — Logging and Monitoring - Storage of the Logging Data](https://support.icompaas.com/compliance/bsi-c5-2020/ops-14-logging-and-monitoring-storage-of-the-logging-data) ## Related controls in NIST SP 800-53 Rev. 5 - [**Control AU-11(1)** — Long-Term Retrieval Capability](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-11-1-long-term-retrieval-capability) - [**Control AU-5(3)** — Configurable Traffic Volume Thresholds](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-5-3-configurable-traffic-volume-thresholds) - [**Control AU-4** — Audit Log Storage Capacity](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-4-audit-log-storage-capacity) - [**Control AU-6(5)** — Integrated Analysis Of Audit Records](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-6-5-integrated-analysis-of-audit-records) - [**Control AU-5(1)** — Storage Capacity Warning](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-5-1-storage-capacity-warning) - [**Control AU-4(1)** — Transfer To Alternate Storage](https://support.icompaas.com/compliance/nist-sp-800-53-rev-5/au-4-1-transfer-to-alternate-storage) ## 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 AU-9(7)` Topics: governance riskcloud postureconfiguration managementnetwork securitylogging monitoring ## 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.