CHAIN-163 — Front Door origin pool without health probe

Summary

Severity: Low · Likelihood: High · Logic: ALL

Why this chain matters

Front Door origin pool has no health probe configured. A failed origin silently receives traffic and returns 502s. During an incident, Front Door cannot route around the failure — availability SLA is meaningless.

Component rules

This chain fires when its trigger conditions are met by the following rules. Click any rule to see its detection logic and compliance mappings.

Rule ID	Role
zt_int_008	Trigger
zt_net_007	Trigger

Attack walkthrough

Step 1 — Origin returns 500s; Front Door continues to route.

Actor: Origin failure
MITRE ATT&CK: T1499
Enabled by: zt_int_008

Attacker gain: Availability collapse.

Step 2 — Extended user-facing outage.

Actor: Business impact
MITRE ATT&CK: T1499
Enabled by: zt_net_007

Attacker gain: Downtime / SLA breach.

Blast radius

Initial access	Origin failure event.
Max privilege	Availability impact.
Data at risk	Service uptime
Services at risk	Front Door + backing app

How the logic works

The chain fires only when every rule above has at least one finding in the current scan. Missing any one rule breaks the chain — so remediating any single step disrupts the attack path.