IR 4(2) Dynamic Reconfiguration

---
name: "IR-4(2)_dynamic-reconfiguration"
description: "Include the following types of dynamic reconfiguration for [organization-defined] as part of the incident response capability: [organization-defined]."
category: "configuration"
version: "5.2.0"
author: "cyberstrike-official"
tags:
  - nist
  - sp800-53
  - rev5
  - ir-4-2
  - ir
  - enhancement
tech_stack:
  - any
cwe_ids: []
chains_with:
  - AC-2
  - AC-4
  - CM-2
prerequisites:
  - IR-4
severity_boost:
  AC-2: "Chain with AC-2 for comprehensive security coverage"
  AC-4: "Chain with AC-4 for comprehensive security coverage"
  CM-2: "Chain with CM-2 for comprehensive security coverage"
---

# IR-4(2) Dynamic Reconfiguration

> **Enhancement of:** IR-4

## High-Level Description

**Family:** Incident Response (IR)
**Framework:** NIST SP 800-53 Rev 5

Dynamic reconfiguration includes changes to router rules, access control lists, intrusion detection or prevention system parameters, and filter rules for guards or firewalls. Organizations may perform dynamic reconfiguration of systems to stop attacks, misdirect attackers, and isolate components of systems, thus limiting the extent of the damage from breaches or compromises. Organizations include specific time frames for achieving the reconfiguration of systems in the definition of the reconfiguration capability, considering the potential need for rapid response to effectively address cyber threats.

## What to Check

- [ ] Verify IR-4(2) Dynamic Reconfiguration is documented in SSP
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for IR-4(2)
- [ ] Verify enhancement builds upon base control IR-4

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for IR-4(2) implementation details. Verify the organization has documented how this control is satisfied.

### Step 2: Validate Implementation

```
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null
```

### Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

## Tools

| Tool          | Purpose                           | Usage |
| ------------- | --------------------------------- | ----- |
| Manual Review | Documentation and interview-based | N/A   |

## Remediation Guide

### Control Statement

Include the following types of dynamic reconfiguration for [organization-defined] as part of the incident response capability: [organization-defined].

### Implementation Guidance

Dynamic reconfiguration includes changes to router rules, access control lists, intrusion detection or prevention system parameters, and filter rules for guards or firewalls. Organizations may perform dynamic reconfiguration of systems to stop attacks, misdirect attackers, and isolate components of systems, thus limiting the extent of the damage from breaches or compromises. Organizations include specific time frames for achieving the reconfiguration of systems in the definition of the reconfiguration capability, considering the potential need for rapid response to effectively address cyber threats.

## Risk Assessment

| Finding                                         | Severity | Impact                       |
| ----------------------------------------------- | -------- | ---------------------------- |
| IR-4(2) Dynamic Reconfiguration not implemented | Medium   | Incident Response            |
| IR-4(2) partially implemented                   | Low      | Incomplete Incident Response |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - IR-4(2)](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=ir-4.2)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (AC-2, AC-4, CM-2) reviewed