CHAIN-090 — NetApp volume NFSv3 without export policy scoping

Summary

Severity: High · Likelihood: Low · Logic: ALL

Why this chain matters

A NetApp volume uses NFSv3 (IP-based auth only) and its export policy allows any subnet in the VNet. A compromised VM in any peered VNet can mount the volume without per-user auth.

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_data_028	Trigger
zt_net_002	Trigger

Attack walkthrough

Step 1 — mount -o nfsvers=3 :/vol /mnt.

Actor: Attacker on peered VM
MITRE ATT&CK: T1078
Enabled by: zt_data_028

Attacker gain: Volume access without per-user auth.

Step 2 — Read every file, no audit trail of per-user access.

Actor: Attacker
MITRE ATT&CK: T1005
Enabled by: zt_net_002

Attacker gain: Silent file exfil.

Blast radius

Initial access	VM foothold in peered VNet.
Max privilege	NFS-layer file access.
Data at risk	NetApp volume contents
Services at risk	NetApp, Dependent file-sharing apps

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.