SI-4(18)

Requirement

Analyze outbound communications traffic at external interfaces to the system and at the following interior points to detect covert exfiltration of information: [Assignment: organization-defined interior points within the system].

Discussion

Organization-defined interior points include subnetworks and subsystems. Covert means that can be used to exfiltrate information include steganography.

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and information integrity policy; system and information integrity procedures; procedures addressing system monitoring tools and techniques; system design documentation; network diagram; system monitoring tools and techniques documentation; system configuration settings and associated documentation; system monitoring logs or records; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; organizational personnel installing, configuring, and/or maintaining the system; organizational personnel responsible for monitoring the system; organizational personnel responsible for the intrusion detection system].

Test

[SELECT FROM: Organizational processes for intrusion detection and system monitoring; mechanisms supporting and/or implementing intrusion detection and system monitoring capabilities; mechanisms supporting and/or implementing an analysis of outbound communications traffic].

ID	Assessment Objectives
SI-04(18)[01]	outbound communications traffic is analyzed at interfaces external to the system to detect covert exfiltration of information;
SI-04(18)[02]	outbound communications traffic is analyzed at <SI-04(18)_ODP interior points> to detect covert exfiltration of information.

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