Ensure 'Authentication type' is set to 'Azure Active Directory' only for Azure VPN Gateway point-to-site configuration
Description
Enable only 'Azure Active Directory' (Microsoft Entra ID) authentication for Azure VPN Gateway point-to-site connections.
Rationale
Microsoft Entra ID authentication provides strong security and centralized identity management, and reduces risks associated with static credentials and certificate management.
Impact
Azure VPN Gateways incur hourly charges, with additional costs for point-to-site connections and data transfer. Pricing varies by SKU and usage. Refer to https://azure.microsoft.com/en-us/pricing/details/vpn-gateway/ for details.
Audit Procedure
Using Azure Portal
- Go to
Virtual network gateways. - Under
VPN gateway, clickVPN gateways. - Click the name of a VPN gateway.
- Under
Settings, clickPoint-to-site configuration. - Ensure
Authentication typeis set toAzure Active Directoryonly. - Repeat steps 1-5 for each VPN gateway.
Using Azure Policy
- Policy ID: 21a6bc25-125e-4d13-b82d-2e19b7208ab7 - Name: 'VPN gateways should use only Azure Active Directory (Azure AD) authentication for point-to-site users'
Expected Result
All Azure VPN Gateway point-to-site configurations should have Authentication type set to Azure Active Directory only, with no other authentication methods (Azure certificate, RADIUS) enabled.
Remediation
Remediate from Azure Portal
- Go to
Virtual network gateways. - Under
VPN gateway, clickVPN gateways. - Click the name of a VPN gateway.
- Under
Settings, clickPoint-to-site configuration. - Ensure
Authentication typeclick to expand the drop-down menu. - Check the box next to
Azure Active Directory, and uncheck the boxes next toAzure certificateandRADIUS authentication. - Provide a
Tenant,Audience, andIssuerfor theAzure Active Directoryconfiguration. - Click
Save. - Repeat steps 1-8 for each VPN gateway requiring remediation.
Default Value
'Authentication type' is selected during creation of point-to-site configuration.
References
- https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-about-vpngateways
- https://learn.microsoft.com/en-us/azure/vpn-gateway/point-to-site-entra-gateway
- https://learn.microsoft.com/en-us/azure/vpn-gateway/openvpn-azure-ad-tenant
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 5.6 Centralize Account Management | x | x | |
| v7 | 16.2 Configure Centralized Point of Authentication | x | x |
Profile
Level 2 | Manual