zt_net_019 — Subnet has no Network Security Group associated¶
Summary
Severity: High · Pillar: Network · Chain role: ENABLER
Description¶
Subnets without an associated Network Security Group have no network-level access control, allowing unrestricted traffic flow. Every subnet except dedicated service subnets (GatewaySubnet, AzureFirewallSubnet, AzureBastionSubnet) must have an NSG.
Mapping¶
| Framework | Control / Reference |
|---|---|
| NIST 800-53 | SC-7 |
| NIST 800-207 | Tenet 5 - Integrity monitored |
| CIS Azure | — |
| MITRE ATT&CK Technique | T1557 |
| MITRE ATT&CK Tactic | Credential Access |
| Zero-Trust Tenet | Tenet 5 |
| Framework tags | nist-800-207, argus-zt |
Source¶
Rule defined at policies/azure/zt/network/zt_net_019.rego.