When a critical cloud alert fires (e.g. credential exposure), how is it triaged?
Demonstrate that critical cloud security alerts are triaged through a documented, time-bound process with clear ownership, escalation paths, and evidence of response actions.
Description
What this control does
This control governs the documented process by which critical cloud security alerts—such as credential exposure, root account usage, public S3 buckets, or IAM privilege escalation—are received, classified, assigned, investigated, and resolved within defined SLAs. It ensures that high-severity events trigger immediate human review, automated containment workflows (e.g., credential revocation, network isolation), and documented remediation actions. Without rapid triage, exposed credentials can be weaponized in minutes, leading to data exfiltration, ransomware, or lateral movement across cloud workloads.
Control objective
What auditing this proves
Demonstrate that critical cloud security alerts are triaged through a documented, time-bound process with clear ownership, escalation paths, and evidence of response actions.
Associated risks
Risks this control addresses
- Exposed IAM keys or service principal credentials are used by an attacker to provision malicious infrastructure or exfiltrate data before detection
- Critical alerts are ignored, delayed, or routed to unmonitored inboxes, allowing privilege escalation or lateral movement to persist undetected
- Lack of automated containment allows attackers to maintain access during manual investigation cycles, prolonging dwell time
- Ambiguous ownership or missing playbooks result in inconsistent or incomplete incident response, failing to remove attacker footholds
- Insufficient logging or alert metadata prevents forensic reconstruction of attacker actions, timelines, and blast radius
- Alert fatigue from poorly tuned detection rules causes responders to deprioritize genuine high-severity events
- Lack of SLA enforcement leads to multi-hour or multi-day response windows, exceeding breach notification thresholds or compliance windows
Testing procedure
How an auditor verifies this control
- Obtain the cloud security incident response policy, runbooks, and escalation matrix documenting triage procedures for critical alerts.
- Review the alerting platform configuration (e.g., SIEM, CSPM, CNAPP) to identify which events are classified as 'critical' and their routing rules.
- Verify that critical alerts are routed to a monitored, staffed communication channel (e.g., PagerDuty, Slack, SOC ticketing system) with documented on-call schedules.
- Select a sample of 5–10 critical alert incidents from the past 90 days (e.g., IAM key exposure, publicly exposed storage, root login) and retrieve associated tickets, logs, and remediation records.
- For each sampled incident, trace the alert from initial detection through acknowledgment, investigation, containment action, and closure, recording timestamps at each stage.
- Confirm that containment actions (e.g., key revocation, policy rollback, network ACL update) were executed within the documented SLA (typically 15–60 minutes for critical events).
- Verify that each incident was reviewed by a qualified responder (security analyst, cloud engineer, or on-call SRE) and that investigation findings, root cause, and remediation are documented in the ticket.
- Test one alert type by simulating a critical event (e.g., deliberately expose a test credential in a non-production environment) and observe whether the alert fires, routes correctly, and triggers the documented triage workflow.