Mapping Controls to CIA Failures

#Turning Breach Post‑Mortems into Actionable Blueprints#link

After studying real breaches, the final step is to systematically map what failed to the CIA triad and select the right control categories to prevent recurrence. This lesson turns abstract case studies into a repeatable mapping methodology you can apply to any incident.

The CIA‑Control Mapping Matrix

Start by listing each aspect of the triad that was violated. For each, determine the root control failure—was it preventive (no MFA), detective (alert ignored), or corrective (no tested backups)? Then propose a multi‑category countermeasure. For example, confidentiality loss due to exfiltration calls for preventive encryption and detective DLP.

Building a Mapping Template

# Incident Mapping Template
- **Incident Name**: Equifax 2017
- **CIA Failure(s)**: Confidentiality, Integrity of consumer data
- **Root Causes**: Unpatched Struts, expired TLS inspection certs
- **Missing Preventive Controls**: Patch management, input validation
- **Missing Detective Controls**: IDS certificate rotation, file integrity monitoring
- **Missing Corrective Controls**: Isolated incident response segment
- **Recommended Additions**:
  - Preventive: Automated vuln scanning
  - Detective: DLP rules for SSN patterns
  - Corrective: Quarterly DR test

This mapping forces teams to think in control categories, not just technology names. It also bridges the gap between technical findings and management language—every executive understands the difference between preventing a breach and detecting one after the fact.

• ▪For every CIA failure in a breach report, identify the missing control category.
• ▪Cross‑reference with frameworks like NIST SP 800‑53 to find specific control IDs.
• ▪Prioritise controls that address the root cause, not just the symptom.