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SI-10(5) SI · System and Information Integrity

Restrict Inputs to Trusted Sources and Approved Formats

LOW MODERATE HIGH
1 Overlay 2 Related Controls
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Requirements NIST SOURCE

Restrict the use of information inputs to [trusted sources] and/or [formats].

Discussion (NIST Supplemental Guidance)

Restricting the use of inputs to trusted sources and in trusted formats applies the concept of authorized or permitted software to information inputs. Specifying known trusted sources for information inputs and acceptable formats for such inputs can reduce the probability of malicious activity. The information inputs are those defined by the organization in the base control ( SI-10).

Implementation Guidance

Engineering Interpretation

Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.

No engineering interpretation has been authored for SI-10(5) yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.

Assessment

NIST SP 800-53A REV 5.2.0

Assessment Objectives

  1. trusted sources to which the use of information inputs is to be restricted are defined;
  2. formats to which the use of information inputs is to be restricted are defined;
  3. the use of information inputs is restricted to <SI-10(05)_ODP[01] trusted sources> and/or <SI-10(05)_ODP[02] formats>.

Examine

[SELECT FROM: System and information integrity policy; system and information integrity procedures; procedures addressing information input validation; system design documentation; system configuration settings and associated documentation; list of trusted sources for information inputs; list of acceptable formats for input restrictions; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel responsible for information input validation; organizational personnel with information security responsibilities; system/network administrators; system developer].

Test

[SELECT FROM: Organizational processes for restricting information inputs; automated mechanisms supporting and/or implementing restriction of information inputs].

Overlays

Showing the OT/ICS overlay for the parent control SI-10 — see the SI-10(5) entries within each baseline below.

OT/ICS Overlay SP 800-82r3

NIST SP 800-82r3 Appendix F, Table 22. Blank baseline means the control/control enhancement is not selected in that initial OT baseline.

LOW

Not applicable at this tier.

MODERATE

  • Base control: Included (matches standard baseline)

HIGH

  • Base control: Included (matches standard baseline)

STIGs & CCIs

No STIG checks or CCI mappings are currently loaded for SI-10(5). This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.

Learn more about STIG/CCI integration →

Evidence

Potential Evidence — Derived

Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.

Policy

  • System and information integrity policy
  • system security plan

Configuration

  • system design documentation
  • system configuration settings and associated documentation

Testing

  • Organizational processes for restricting information inputs
  • automated mechanisms supporting and/or implementing restriction of information inputs

Other Records

  • system and information integrity procedures
  • procedures addressing information input validation
  • list of trusted sources for information inputs
  • list of acceptable formats for input restrictions
  • system audit records
  • other relevant documents or records