CHAIN-126 — Service Fabric cluster with TLS downgrade

Summary

Severity: High · Likelihood: Low · Logic: ALL

Why this chain matters

A Service Fabric cluster accepts TLS 1.0 for node-to-node communication. A legacy-protocol downgrade attack on the management endpoint yields cluster admin — Service Fabric node identity is the root of trust for the entire cluster.

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_wl_027	Trigger
zt_net_002	Trigger

Attack walkthrough

Step 1 — Force TLS 1.0 negotiation; MITM the session.

Actor: On-path adversary
MITRE ATT&CK: T1557.001
Enabled by: zt_wl_027

Attacker gain: Decrypted node-to-node traffic.

Step 2 — Replay node auth; join attacker node as cluster member.

Actor: Attacker
MITRE ATT&CK: T1606.002
Enabled by: zt_net_002

Attacker gain: Service Fabric node that controls the cluster.

Blast radius

Initial access	On-path MITM.
Max privilege	Cluster admin.
Data at risk	All app state
Services at risk	Service Fabric cluster

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.