CMMC Navigatorby Foxx Cyber Bedrock CMMC

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3.1.22Review what goes on public sites

Someone checks that nothing sensitive reaches your website or social accounts.

The requirement, verbatim

NIST SP 800-171 Rev. 2 · 3.1.22

Control CUI posted or processed on publicly accessible systems.

Requirement 3.1.22, practice name in the CMMC assessment guide: Control Public Information.

NIST's discussion

In accordance with laws, Executive Orders, directives, policies, regulations, or standards, the public is not authorized access to nonpublic information (e.g., information protected under the Privacy Act, CUI, and proprietary information). This requirement addresses systems that are controlled by the organization and accessible to the public, typically without identification or authentication. Individuals authorized to post CUI onto publicly accessible systems are designated. The content of information is reviewed prior to posting onto publicly accessible systems to ensure that nonpublic information is not included.

NIST SP 800-171 Rev. 2, discussion under 3.1.22. Whitespace normalised; wording unchanged.

Assessment objectives

An assessor decides each of these separately. The requirement is met only when every objective is.

  1. [a] individuals authorized to post or process information on publicly accessible systems are identified
  2. [b] procedures to ensure CUI is not posted or processed on publicly accessible systems are identified
  3. [c] a review process is in place prior to posting of any content to publicly accessible systems
  4. [d] content on publicly accessible systems is reviewed to ensure that it does not include CUI

NIST SP 800-171A, determination statements for 3.1.22.

For assessors: examine, interview, test

NIST SP 800-171A names what an assessor may examine, whom they may interview, and what they may test for this requirement. Assessors select from these lists; they are not a checklist of everything you must produce.

Examine
  • Access control policy
  • procedures addressing publicly accessible content
  • list of users authorized to post publicly accessible content
  • system security plan
  • records of publicly accessible information reviews
  • records of response to nonpublic information on public websites
  • system audit logs and records
  • other relevant documents or records
Interview
  • Personnel with responsibilities for managing publicly accessible information
  • personnel with information security responsibilities
Test
  • Mechanisms implementing management of publicly accessible content

NIST SP 800-171A, potential assessment methods and objects for 3.1.22.

Evidence

No evidence examples are published for this requirement yet. The objectives above are what an assessor checks; evidence is whatever shows each one is true in your environment, dated and kept with your system security plan.

Scoring weight

Worth 1 point. Not meeting this requirement subtracts 1 from your 110-point SPRS score.

DoD NIST SP 800-171 Assessment Methodology v1.2.1 weighting, as carried in the Bedrock scoring table. The score starts at 110 and subtracts the weight of every requirement not met.

In Rev. 3

Rev. 2 is what your contract requires today. A standing DoD class deviation keeps Rev. 2 in force; NIST has published Rev. 3, but it is not adopted for contracts. In Rev. 3 this requirement is reworded: 03.01.22 Publicly Accessible Content.

See the Rev. 2 and Rev. 3 wording word by word, or start with the status page.

Where this page's facts come from
Requirement text
bedrock-cmmc-api@89b8e8e:migrations/004_reference_requirements.sql#Requirement.basicRequirement@rev2
Discussion
bedrock-cmmc-api@89b8e8e:migrations/004_reference_requirements.sql#Requirement.discussion@rev2
Practice name
bedrock-cmmc-api@89b8e8e:migrations/004_reference_requirements.sql#Requirement.title@rev2 (CMMC Assessment Guide practice name)
Objectives
bedrock-cmmc-api@89b8e8e:migrations/005_reference_objectives.sql#AssessmentObjective.description@rev2
Examine, interview, test
bedrock-cmmc-api@89b8e8e:migrations/005_reference_objectives.sql#AssessmentObjective.description@rev2 ({examineGuidance, interviewGuidance, testGuidance})
Level
bedrock-cmmc-api@89b8e8e:migrations/021_fix_level1_requirements.sql#Requirement.cmmcLevel@rev2
Weight
bedrock-cmmc-api@89b8e8e:internal/cmmc/requirement_values.go#requirementValues (DoD AM v1.2.1 / eMASS L2 template v3.8)
Rev. 3 mapping
bedrock-cmmc-api@89b8e8e:docs/reference/nist-800-171-rev3/normalized/r2_r3_transition_map.json#r2_to_r3
Plain-language title and summary
editorial/CMMC Navigator.dc.html#RAW (Foxx Cyber editorial)