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Ensure deployment slot is integrated with a virtual network

Description

Integrate App Service deployment slots with a virtual network to enable access to resources in or through a non-internet-routable virtual network.

Rationale

Integrate App Service deployment slots with a virtual network for increased security and control.

Impact

Additional configuration may be required to ensure that traffic is routed properly.

Audit Procedure

Using Azure Portal

1. Go to App Services.
2. Click the name of an app.
3. Under Deployment, click Deployment slots.
4. Click the name of a deployment slot.
5. Under Settings, click Networking.
6. Under Outbound traffic configuration, next to Virtual network integration, ensure that a virtual network and subnet name are displayed.
7. Repeat steps 1-6 for each app and deployment slot.

Using Azure CLI

Run the following command to list apps:

az webapp list

For each app, run the following command to list deployment slots:

az webapp deployment slot list --resource-group <resource-group-name> --name <app-name>

For each deployment slot, ensure that virtualNetworkSubnetId is set to a virtual network subnet ID.

Expected Result

The virtualNetworkSubnetId property should contain a valid virtual network subnet resource ID (not null or empty).

Remediation

Using Azure Portal

1. Go to App Services.
2. Click the name of an app.
3. Under Deployment, click Deployment slots.
4. Click the name of a deployment slot.
5. Under Settings, click Networking.
6. Under Outbound traffic configuration, next to Virtual network integration, click Not configured.
7. Click Add virtual network integration.
8. Select an existing App Service Plan connection, or select New connection and select a subscription, virtual network, and subnet.
9. Click Connect.
10. Repeat steps 1-9 for each app and deployment slot requiring remediation.

Default Value

By default, virtual network integration is not configured.

References

1. https://learn.microsoft.com/en-us/azure/app-service/overview-vnet-integration
2. https://learn.microsoft.com/en-us/azure/app-service/configure-vnet-integration-enable
3. https://learn.microsoft.com/en-us/cli/azure/webapp
4. https://learn.microsoft.com/en-us/cli/azure/webapp/deployment/slot

Profile

Level 1 | Automated