AC-4(24)

Requirement

When transferring information between different security domains, parse incoming data into an internal normalized format and regenerate the data to be consistent with its intended specification.

Discussion

Converting data into normalized forms is one of most of effective mechanisms to stop malicious attacks and large classes of data exfiltration.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: Information flow enforcement policy; procedures addressing information flow enforcement; system design documentation; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: Organizational personnel with information flow enforcement responsibilities; system/network administrators; organizational personnel with information security responsibilities].

Test

[SELECT FROM: Mechanisms implementing information flow enforcement functions].

ID	Assessment Objectives
AC-04(24)[01]	when transferring information between different security domains, incoming data is parsed into an internal, normalized format;
AC-04(24)[02]	when transferring information between different security domains, the data is regenerated to be consistent with its intended specification.

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