Cis Azure Database 3.2

3.2 Ensure that Cosmos DB uses Private Endpoints where possible (Automated)

Profile Applicability

• Level 2

Description

Private endpoints limit network traffic to approved sources.

Rationale

For sensitive data, private endpoints allow granular control of which services can communicate with Cosmos DB and ensure that this network traffic is private. This can be set this up on a case by case basis for each service to be connected.

Impact

Only whitelisted services will have access to communicate with the Cosmos DB.

Audit Procedure

Audit From Azure Portal

1. Open the portal menu.
2. Select the Azure Cosmos DB blade.
3. Select the Azure Cosmos DB account.
4. Select Networking.
5. Ensure Public network access is set to Selected networks.
6. Ensure the listed networks are set appropriately.
7. Select Private access.
8. Ensure a private endpoint exists and Connection state is Approved.

Audit From Azure Policy

• Policy ID: 58440f8a-10c5-4151-bdce-dfbaad4a20b7 - Name: 'CosmosDB accounts should use private link'

Expected Result

A private endpoint should exist with Connection state set to Approved, and Public network access should be set to Selected networks.

Remediation

Remediate From Azure Portal

1. Open the portal menu.
2. Select the Azure Cosmos DB blade.
3. Select the Azure Cosmos DB account.
4. Select Networking.
5. Select Private access.
6. Click + Private Endpoint.
7. Provide a Name.
8. Click Next.
9. From the Resource type drop down, select Microsoft.AzureCosmosDB/databaseAccounts.
10. From the Resource drop down, select the Cosmos DB account.
11. Click Next.
12. Provide appropriate Virtual Network details.
13. Click Next.
14. Provide appropriate DNS details.
15. Click Next.
16. Optionally provide Tags.
17. Click Next : Review + create.
18. Click Create.

Default Value

By default Cosmos DB does not have private endpoints enabled and its traffic is public to the network.

References

1. https://docs.microsoft.com/en-us/azure/cosmos-db/how-to-configure-private-endpoints
2. https://docs.microsoft.com/en-us/azure/private-link/tutorial-private-endpoint-cosmosdb-portal
3. https://docs.microsoft.com/en-us/cli/azure/cosmosdb/private-endpoint-connection?view=azure-cli-latest
4. https://docs.microsoft.com/en-us/cli/azure/network/private-endpoint?view=azure-cli-latest#az-network-private-endpoint-create
5. https://learn.microsoft.com/en-us/security/benchmark/azure/mcsb-network-security#ns-2-secure-cloud-native-services-with-network-controls

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