IR-9_information-spillage-response

IR-9 Information Spillage Response

High-Level Description

Family: Incident Response (IR) Framework: NIST SP 800-53 Rev 5

Information spillage refers to instances where information is placed on systems that are not authorized to process such information. Information spills occur when information that is thought to be a certain classification or impact level is transmitted to a system and subsequently is determined to be of a higher classification or impact level. At that point, corrective action is required. The nature of the response is based on the classification or impact level of the spilled information, the security capabilities of the system, the specific nature of the contaminated storage media, and the access authorizations of individuals with authorized access to the contaminated system. The methods used to communicate information about the spill after the fact do not involve methods directly associated with the actual spill to minimize the risk of further spreading the contamination before such contamination is isolated and eradicated.

What to Check

• Verify IR-9 Information Spillage Response is documented in SSP
• Validate all 7 control requirements are implemented
• Confirm control is operating effectively
• Review evidence of continuous monitoring for IR-9

How to Test

Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for IR-9 implementation details. Verify the organization has documented how this control is satisfied.

Step 2: Validate Implementation

# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null

Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

Tools

Remediation Guide

Control Statement

Respond to information spills by: Assigning [organization-defined] with responsibility for responding to information spills; Identifying the specific information involved in the system contamination; Alerting [organization-defined] of the information spill using a method of communication not associated with the spill; Isolating the contaminated system or system component; Eradicating the information from the contaminated system or component; Identifying other systems or system components that may have been subsequently contaminated; and Performing the following additional actions: [organization-defined].

Implementation Guidance

Information spillage refers to instances where information is placed on systems that are not authorized to process such information. Information spills occur when information that is thought to be a certain classification or impact level is transmitted to a system and subsequently is determined to be of a higher classification or impact level. At that point, corrective action is required. The nature of the response is based on the classification or impact level of the spilled information, the security capabilities of the system, the specific nature of the contaminated storage media, and the access authorizations of individuals with authorized access to the contaminated system. The methods used to communicate information about the spill after the fact do not involve methods directly associated with the actual spill to minimize the risk of further spreading the contamination before such contamination is isolated and eradicated.

Risk Assessment

CWE Categories

References

• NIST SP 800-53 Rev 5 - IR-9
• NIST SP 800-53A Rev 5 (Assessment Procedures)
• NIST SP 800-53 Rev 5 Full Catalog

Checklist

• Control documented in SSP
• Implementation evidence collected
• Operating effectiveness validated
• Continuous monitoring in place
• Related controls (CP-2, IR-6, PM-26, PM-27, PT-2) reviewed