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NET-41.3: Data Type Identifiers

NET 5 — Medium Protect

Automated mechanisms exist to utilize data type identifiers to validate data essential for information flow decisions when transferring information between different security domains.

Renumbered: Formerly NET-04.8 in SCF 2025.4.

Control Question: Does the organization use automated mechanisms to utilize data type identifiers to validate data essential for information flow decisions when transferring information between different security domains?

General (6)
Framework Mapping Values
NIST 800-53 R4 AC-4(12)
NIST 800-53 R5.2 AC-04(12)
NIST 800-82 R3 AC-04(12)
NIST 800-160 Vol2 R1 AC-04(12)
NIST 800-172 R3 03.01.13E 03.01.14E 03.01.15E
NIST 800-172A R3 DS-A.03.01.13E DS-A.03.01.14E.a DS-A.03.01.15E A.03.01.15E.ODP[01]

Capability Maturity Model

Level 0 — Not Performed

Practices are non-existent, based on the inability to demonstrate an implemented and operational capability. A reasonable person would conclude the control is not being performed.

Level 1 — Performed Informally

SCR-CMM Level 1 criteria definitions are not available for this control: ▪ A reasonable person would conclude this control requires a structured process. ▪ At this level of maturity, the "ad hoc" nature of performing a capability informally would indicate the intent of the control is not met due to a lack of consistency and formality.

Level 2 — Planned & Tracked

SCR-CMM Level 2 criteria definitions are not available for this control: ▪ A reasonable person would conclude a well-defined and standardized process is required. ▪ At this level of maturity, the “requirements-driven” nature of performing the control is focused on a localized and/or regionalized implementation, not uniform and consistent across the organization. ▪ Requirements are narrowly scoped for applicability and are primarily derived from compliance obligations (e.g., laws, regulations and contracts).

Level 3 — Well Defined

Network Security (NET) capabilities are standardized across the entity for applicability to People, Processes, Technologies, Data and/or Facilities (PPTDF) to ensure consistency for Technology Assets, Applications, Services and/or Data (TAASD). Capability criteria associated with this control reasonably expect the following criteria to exist: ▪ Policies and standards associated with NET domain capabilities are formally documented and centrally-managed by the entity's Governance, Risk & Compliance (GRC) team, or similar function. ▪ Standardized Operating Procedures (SOP) associated with NET domain capabilities are well-documented and kept current by process owners. ▪ A network security management team, or similar function, is appropriately staffed and supported to implement and maintain NET domain capabilities. ▪ Technology is leveraged to enhance the efficiency and accuracy of network security operations (e.g., network management solution and log aggregator). ▪ The entity's Governance, Risk & Compliance (GRC) team, or similar function, works with business stakeholders and process owners to appropriately scope and reasonably implement cybersecurity and data protection controls associated with NET domain capabilities to address Minimum Compliance Requirements (MCR) (e.g., applicable statutory, regulatory and/or contractual requirements) and Discretionary Security Requirements (DSR) (e.g., entity-required controls). ▪ Secure Baseline Configurations (SBC) enforce the principles of least privileges and least functionality for boundary protection technologies. ▪ An implemented and operational capability exists to automatically utilize data type identifiers to validate data essential for information flow decisions when transferring information between different security domains.

Level 4 — Quantitatively Controlled

Utilize SCR-CMM Level 3 criteria definitions: ▪ There are no defined Level 4 criteria, since it is reasonable to assume a quantitatively-controlled process is not necessary to operationalize this control. ▪ While it may be possible to develop “metrics-driven” capabilities for this control, the criteria would be organization-specific to define.

Level 5 — Continuously Improving

Utilize SCR-CMM Level 3 or Level 4 (if available) criteria definitions: ▪ There are no defined Level 5 criteria, since it is reasonable to assume a continuously-improving process is not necessary to operationalize this control. ▪ Level 5 capabilities should be considered “world-class” where the control builds on Level 4 capabilities, but are continuously improving through Artificial Intelligence (AI) and/or Machine Learning (ML) technologies. ▪ While it may be possible to develop responsive capabilities for this control through the use of AI and/or ML technologies, the criteria would be organization-specific to define.

Assessment Objectives

  1. NET-41.3_A01 data type identifiers to be used to validate data essential for information flow decisions are defined.
  2. NET-41.3_A02 when transferring information between different security domains, organization-defined data type identifiers are used to validate data essential for information flow decisions.

Technology Recommendations

Micro/Small

  • Use file extension controls to restrict unauthorized data types

Small

  • File type controls at email and web gateways

Medium

  • Data type identifier policy
  • Content inspection with data type identification

Large

  • Enterprise DLP with data type identification capabilities

Enterprise

  • Enterprise DLP with advanced data type identification (e.g., Symantec DLP, Forcepoint)
  • Pattern-based detection

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