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IR-4 (2)

IR-4 (2): Dynamic Reconfiguration

The organization includes dynamic reconfiguration of [Assignment: organization-defined information system components] as part of the incident response capability.

Supplemental

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

CIA Levels
Confidentiality	unknown
Integrity	unknown
Availability	unknown

Overlays
None

Related Controls

The controls below (if any) were marked by NIST as being related to IR-4 (2).

Control	Description
AC-2	The organization: AC-2a.: Identifies and selects the following types of information system accounts to support organizational missions/business functions: [Assignment: organization-defined information system account types]; AC-2b.: Assigns account managers for information system accounts; AC-2c.: Establishes conditions for group and role membership; AC-2d.: Specifies authorized users of the information system, group and role membership, and access authorizations (i.e., privileges) and other attributes (as required) for each account; AC-2e.: Requires approvals by [Assignment: organization-defined personnel or roles] for requests to create information system accounts; AC-2f.: Creates, enables, modifies, disables, and removes information system accounts in accordance with [Assignment: organization-defined procedures or conditions]; AC-2g.: Monitors the use of information system accounts; AC-2h.: Notifies account managers: AC-2h.1.: When accounts are no longer required; AC-2h.2.: When users are terminated or transferred; and AC-2h.3.: When individual information system usage or need-to-know changes; AC-2i.: Authorizes access to the information system based on: AC-2i.1.: A valid access authorization; AC-2i.2.: Intended system usage; and AC-2i.3.: Other attributes as required by the organization or associated missions/business functions; AC-2j.: Reviews accounts for compliance with account management requirements [Assignment: organization-defined frequency]; and AC-2k.: Establishes a process for reissuing shared/group account credentials (if deployed) when individuals are removed from the group.
AC-4	The information system enforces approved authorizations for controlling the flow of information within the system and between interconnected systems based on [Assignment: organization-defined information flow control policies].
AC-16	The organization: AC-16a.: Provides the means to associate [Assignment: organization-defined types of security attributes] having [Assignment: organization-defined security attribute values] with information in storage, in process, and/or in transmission; AC-16b.: Ensures that the security attribute associations are made and retained with the information; AC-16c.: Establishes the permitted [Assignment: organization-defined security attributes] for [Assignment: organization-defined information systems]; and AC-16d.: Determines the permitted [Assignment: organization-defined values or ranges] for each of the established security attributes.
CM-2	The organization develops, documents, and maintains under configuration control, a current baseline configuration of the information system.
CM-3	The organization: CM-3a.: Determines the types of changes to the information system that are configuration-controlled; CM-3b.: Reviews proposed configuration-controlled changes to the information system and approves or disapproves such changes with explicit consideration for security impact analyses; CM-3c.: Documents configuration change decisions associated with the information system; CM-3d.: Implements approved configuration-controlled changes to the information system; CM-3e.: Retains records of configuration-controlled changes to the information system for [Assignment: organization-defined time period]; CM-3f.: Audits and reviews activities associated with configuration-controlled changes to the information system; and CM-3g.: Coordinates and provides oversight for configuration change control activities through [Assignment: organization-defined configuration change control element (e.g., committee, board)] that convenes [Selection (one or more): [Assignment: organization-defined frequency]; [Assignment: organization-defined configuration change conditions]].
CM-4	The organization analyzes changes to the information system to determine potential security impacts prior to change implementation.

Enhancements

The controls below (if any) add on to the requirements of IR-4 (2).

Control	Description
No controls

Related CCIs

The CCIs below are tied to IR-4 (2).

CCI	Definition
CCI-000826	The organization includes dynamic reconfiguration of organization-defined information system components as part of the incident response capability.
CCI-002781	The organization defines the information system components for dynamic reconfiguration as part of the incident response capability.