Discover how to ensure secure access to VM0 while meeting platform protection requirements in your Azure environment. Learn the steps to move VM0 to the right subnet and configure Azure Firewall for a robust security solution.
Table of Contents
Question
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Overview
Litware, Inc. is a digital media company that has 500 employees in the Chicago area and 20 employees in the San Francisco area.
Existing Environment
- Litware has an Azure subscription named Sub1 that has a subscription ID of 43894a43-17c2-4a39-8cfc-3540c2653ef4.
- Sub1 is associated to an Azure Active Directory (Azure AD) tenant named litwareinc.com. The tenant contains the user objects and the device objects of all the
- Litware employees and their devices. Each user is assigned an Azure AD Premium P2 license. Azure AD Privileged Identity Management (PIM) is activated.
The tenant contains the groups shown in the following table.
| Name | Type | Description |
|---|---|---|
| Group1 | Security group | A group that has the Dynamic User membership type, contains all the San Francisco users, and provides access to many Azure AD applications and Azure resources. |
| Group2 | Security group | A group that has the Dynamic User membership type and contains the Chicago IT team. |
The Azure subscription contains the objects shown in the following table.
| Name | Type | Description |
|---|---|---|
| VNet1 | Virtual network | VNet1 is a virtual network that contains security-sensitive IT resources. VNet1 contains three subnets named Subnet0, Subnet1, and AzureFirewallSubnet. |
| VM0 | Virtual machine | VM0 is an Azure virtual machine that runs Windows Server 2016, connects to Subnet0, and has just in time (JIT) VM access configured. |
| VM1 | Virtual machine | VM1 is an Azure virtual machine that runs Windows Server 2016 and connects to Subnet0. |
| SQLDB1 | Azure SQL Database | SQLDB1 is an Azure SQL database on a SQL Database server named LitwareSQLServer1. |
| WebApp1 | Web App | WebApp1 is an Azure web app that is accessible by using https://www.litwareinc.com and http://www.litwareinc.com. |
| RG1 | Resource group | RG1 is a resource group that contains VNet1, VM0, and VM1. |
| RG2 | Resource group | RG2 is a resource group that contains shared IT resources. |
Azure Security Center is set to the Standard tier.
Requirements
Planned Changes
Litware plans to deploy the Azure resources shown in the following table.
| Name | Type | Description |
|---|---|---|
| Firewall1 | Azure Firewall | An Azure firewall on VNet1. |
| RT1 | Route table | A route table that will contain a route pointing to Firewall1 as the default gateway and will be assigned to Subnet0. |
| AKS1 | Azure Kubernetes Service (AKS) | A managed AKS cluster. |
Identity and Access Requirements:
Litware identifies the following identity and access requirements:
- All San Francisco users and their devices must be members of Group1.
- The members of Group2 must be assigned the Contributor role to RG2 by using a permanent eligible assignment.
- Users must be prevented from registering applications in Azure AD and from consenting to applications that access company information on the users’ behalf.
Platform Protection Requirements
Litware identifies the following platform protection requirements:
- Microsoft Antimalware must be installed on the virtual machines in RG1.
- The members of Group2 must be assigned the Azure Kubernetes Service Cluster Admin Role.
- Azure AD users must be able to authenticate to AKS1 by using their Azure AD credentials.
- Following the implementation of the planned changes, the IT team must be able to connect to VM0 by using JIT VM access.
- A new custom RBAC role named Role1 must be used to delegate the administration of the managed disks in RG1. Role1 must be available only for RG1.
Security Operations Requirements
- Litware must be able to customize the operating system security configurations in Azure Security Center.
Data and Application Requirements
- Litware identifies the following data and applications requirements:
- The users in Group2 must be able to authenticate to SQLDB1 by using their Azure AD credentials.
- WebApp1 must enforce mutual authentication.
General Requirements
Litware identifies the following general requirements:
- Whenever possible, administrative effort must be minimized.
- Whenever possible, use of automation must be maximized.
You need to ensure that users can access VM0. The solution must meet the platform protection requirements.
What should you do?
A. Move VM0 to Subnet1.
B. On Firewall, configure a network traffic filtering rule.
C. Assign RT1 to AzureFirewallSubnet.
D. On Firewall, configure a DNAT rule.
Answer
A. Move VM0 to Subnet1.
Explanation
Azure Firewall has the following known issue:
Conflict with Azure Security Center (ASC) Just-in-Time (JIT) feature.
If a virtual machine is accessed using JIT, and is in a subnet with a user-defined route that points to Azure Firewall as a default gateway, ASC JIT doesn’t work.
This is a result of asymmetric routing – a packet comes in via the virtual machine public IP (JIT opened the access), but the return path is via the firewall, which drops the packet because there is no established session on the firewall.
Solution: To work around this issue, place the JIT virtual machines on a separate subnet that doesnג€™t have a user-defined route to the firewall.
Scenario:
| Name | Type | Description |
|---|---|---|
| VM0 | Virtual machine | VM0 is an Azure virtual machine that runs Windows Server 2016, connects to Subnet0, and has just in time (JIT) VM access configured. |
Following the implementation of the planned changes, the IT team must be able to connect to VM0 by using JIT VM access.
| Name | Type | Description |
|---|---|---|
| Firewall1 | Azure Firewall | An Azure firewall on VNet1. |
| RT1 | Route table | A route table that will contain a route pointing to Firewall1 as the default gateway and will be assigned to Subnet0. |
Reference
- Azure > Networking > Firewall > What is Azure Firewall?
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