# NIST800 53 AC-2(1) — Automated System Account Management

- Source: https://support.icompaas.com/support/solutions/articles/a_gen_nist80053_ac21_34ffbc7c0e-nist800-53-ac-21-automated-system-account-management
- Section: [Solutions](https://support.icompaas.com/support/solutions) › [NIST](https://support.icompaas.com/support/solutions/62000112528) › [Access Control](https://support.icompaas.com/support/solutions/folders/f_gen_62000112528_accesscontrol)
- Last updated: 2026-05-30
- Publisher: iCompaas, Inc. (https://www.icompaas.com)

NIST800 53 · Control AC-2(1) · Priority: high · Component: Access Control

### What this control covers

Use automated mechanisms to manage system accounts, including creating, enabling, modifying, disabling, and removing accounts; notifying account managers of account changes or user termination/transfer; monitoring account usage; and reporting atypical usage. Automated mechanisms may include system functions, email, telephonic, or text notifications. This control supports the Governance capability within the Access Control family.

### Why it matters

Identity is the new perimeter — most breaches start with a stolen credential or over-privileged account, so this control is one of the single highest-leverage items you can implement.

### How to implement

#### AWS

Use **IAM Identity Center** (formerly AWS SSO) as the single source of truth for human access; back it with your corporate IdP via SAML/SCIM. Avoid IAM users for people — they don't get MFA-by-default, rotation, or session lifetimes. For workloads, use **IAM Roles** (assumed by EC2/Lambda/EKS service accounts via IRSA) and never long-lived access keys. Run [IAM Access Analyzer](https://docs.aws.amazon.com/IAM/latest/UserGuide/access-analyzer.html) weekly to surface unused access and external-account exposure.

#### Azure

Centralize identity on **Microsoft Entra ID** (formerly Azure AD). Require **Conditional Access** policies: MFA for all admin roles, block legacy auth, location/device gating. Use **Privileged Identity Management (PIM)** to make admin roles just-in-time and time-bound. For Azure resources, prefer **Managed Identities** over service principals with secrets.

#### GCP

Use **Cloud Identity** (or Workspace) as the IdP and **IAM** for resource access. Grant roles at the lowest scope (project > folder > org) using **Workload Identity Federation** for CI/CD and **service accounts** for workloads — never download service-account keys when avoidable. Enable **Policy Intelligence** recommenders to right-size privileges and detect dormant identities.

#### Google Workspace

Enforce **2-Step Verification** (preferably hardware keys for admins) for the entire org, set session length to ≤ 12 hours, and disable less-secure-app access. Use **Context-Aware Access** levels to restrict admin sign-in by IP/device posture. Provision and de-provision users via **SCIM** from your HRIS so leavers lose access on day one.

#### GitHub

Require **SSO + SCIM** from your IdP on the organisation; enforce **2FA** org-wide and use **fine-grained PATs** (or, better, GitHub Apps) instead of classic tokens. Restrict **outside collaborators**, require signed commits on protected branches, and use **OIDC** from Actions to short-lived AWS/GCP/Azure credentials rather than stored secrets.

#### Zoho Mail

Make **two-factor authentication** mandatory for all users (TOTP, OneAuth, or YubiKey) in _Admin Console → Security_. Configure **SAML SSO** against your IdP and disable password-based logins for admins. Use **role-based privileges** (Admin / Spam Moderator / Mail Account Admin) and review the _Login history_ report monthly for anomalies.

### Evidence to collect

-   `identity_scan` — See the iCompaas Evidence library for the canonical source for this evidence type.

Identity analytics (Okta, SailPoint, Access Analyzer) demonstrates least-privilege. Focus: Automated System Account Management.

### Quick checklist

-   Account — Management / System Account Management
-   Usage — Management / System Account Management
-   Access — Management / System Account Management
-   Review — Management / System Account Management
-   Termination — Management / System Account Management
-   Access Control — Management / System Account Management

### Related articles on this site

-   [Ensure Access Review is Set Up for External Users in Azure AD Privileged Identity Management (PIM](https://support.icompaas.com/support/solutions/articles/62000229788-ensure-access-review-is-set-up-for-external-users-in-azure-ad-privileged-identity-management-pim)
-   [NIST 800-171 3.5.4 Employ replay-resistant authentication mechanisms for network access to privileged and non-privileged accounts.](https://support.icompaas.com/support/solutions/articles/62000229292-nist-800-171-3-5-4-employ-replay-resistant-authentication-mechanisms-for-network-access-to-privileged)
-   [CMMC 2.0 IA.3.084 Employ replay-resistant authentication mechanisms for network access to privileged and non-privileged accounts.](https://support.icompaas.com/support/solutions/articles/62000229477-cmmc-2-0-ia-3-084-employ-replay-resistant-authentication-mechanisms-for-network-access-to-privileged-)
-   [1.4 Ensure No 'Root' User Account Access Key Exists (Automated)](https://support.icompaas.com/support/solutions/articles/62000233151-1-4-ensure-no-root-user-account-access-key-exists-automated-)

## 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): How the 800-53 catalogue, baselines and the Risk Management Framework fit together, and which controls take the most work in the cloud.
- [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 the driver is a DoD or federal contract handling CUI, 800-171 (and CMMC) is the scope you actually need.