Cis Azure Compute 2.1.19
DevOps & Securitycis-azure-compute-2.1.19Cis Azure Compute 2.1.19 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.
Ensure configuration is routed through the virtual network integration
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Ensure configuration is routed through the virtual network integration
Description
By default, configuration traffic for App Service apps goes directly over the public route. Container image pulls and content sharing can be routed through the virtual network integration.
This recommendation should be applied after integrating an App Service app with a virtual network.
Rationale
Route container image pulls and content sharing through a virtual network integration for increased security and control.
Impact
Additional configuration may be required to ensure that traffic is routed properly.
Audit Procedure
Using Azure CLI
Run the following command to list apps:
az webapp list
For each app, run the following command to get the container image share and content share settings:
az webapp show --resource-group <resource-group-name> --name <app-name> --query "[vnetImagePullEnabled,vnetContentShareEnabled]"
Ensure that [true,true] is returned.
Using Azure Portal
Not specifically documented with portal-only steps for this control.
Using Azure PowerShell
Not specifically documented for this control.
Expected Result
Both vnetImagePullEnabled and vnetContentShareEnabled should return true.
Remediation
Using Azure CLI
For each app requiring remediation, run the following command to route container image pulls and content sharing through the virtual network integration:
az resource update --resource-group <resource-group-name> --name <app-name> --resource-type "Microsoft.Web/sites" --set properties.vnetImagePullEnabled=true --set properties.vnetContentShareEnabled=true
Using Azure Portal
Not specifically documented with portal-only steps for this control.
Using Azure PowerShell
Not specifically documented for this control.
Default Value
By default, configuration traffic goes directly over the public route.
Additional Information
In addition to configuring the routing for content sharing, you must also ensure that any firewall or Network Security Group configured on traffic from the subnet allow traffic to port 443 and 445.
References
- https://learn.microsoft.com/en-us/azure/app-service/overview-vnet-integration#routes
- https://learn.microsoft.com/en-us/azure/app-service/configure-vnet-integration-routing#configure-configuration-routing
- https://learn.microsoft.com/en-us/cli/azure/webapp
- https://learn.microsoft.com/en-us/cli/azure/resource
Profile
Level 2 | Automated