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Verify that Server Parameter 'log_retention_days' is greater than 3 days for PostgreSQL Database ServerVerify that server parameter 'connection_throttling' is set to 'ON' for PostgreSQL Database ServerVerify that server parameter 'log_disconnections' is set to 'ON' for PostgreSQL Database ServerVerify that server parameter 'log_connections' is set to 'ON' for PostgreSQL Database ServerVerify that 'Enforce SSL connection' is set to 'ENABLED' for PostgreSQL Database ServerVerify that Server Parameter 'log_checkpoints' is set to 'ON' for PostgreSQL Database ServerVerify that Activity Log Alert exists for Create Policy AssignmentVerify that Activity Log Alert exists for Create or Update Public IP Address ruleVerify that no Azure SQL Databases allow ingress from 0.0.0.0/0 (ANY IP)Verify that Activity Log Alert exists for Delete SQL Server Firewall RuleVerify that Activity Log Alert exists for Create or Update SQL Server Firewall RuleVerify that Activity Log Alert exists for Delete Network Security GroupVerify that the storage account containing the container with activity logs is encrypted with Customer Managed KeyVerify that Activity Log Alert exists for Delete Policy AssignmentVerify that Activity Log Alert exists for Create or Update Network Security GroupVerify that Diagnostic Setting captures appropriate categoriesVerify that Activity Log Alert exists for Create or Update Security SolutionVerify that Activity Log Alert exists for Delete Public IP Address ruleVerify that logging for Azure AppService 'HTTP logs' is enabledVerify that logging for Azure Key Vault is 'Enabled'Verify that the Expiration Date is set for all Keys in RBAC Key VaultsEnable Role Based Access Control for Azure Key VaultVerify that Private Endpoints are Used for Azure Key VaultVerify that the Key Vault is RecoverableVerify that HTTP(S) access from the Internet is evaluated and restrictedVerify that SSH access from the Internet is evaluated and restrictedVerify that Network Security Group Flow Log retention period is 'greater than 90 days'Verify that Network Watcher is 'Enabled' for all locations in the Azure subscriptionVerify that RDP access from the Internet is evaluated and restrictedVerify that That 'Firewalls & Networks' Is Limited to Use Selected Networks Instead of All NetworksVerify that That Private Endpoints Are Used Where PossibleVerify that 'Enforce SSL connection' is set to 'Enabled' for Standard MySQL Database ServerVerify that 'TLS Version' is set to 'TLSV1.2' for MySQL flexible Database ServerVerify that SQL server's Transparent Data Encryption (TDE) protector is encryptedVerify that 'Auditing' Retention is 'greater than 90 days'Verify that Application Insights are Configured.Verify that 'Restrict non-admin users from creating tenants' is set to 'Yes'Verify that 'Guest invite restrictions' is set to 'Only users assigned to specific admin roles can invite guest users'Verify that That 'Guest users access restrictions' is set to 'Guest user access is restricted to properties and memberships of their own directory objects'Ensure Microsoft Defender for open-source relational databases is enabledVerify that That Microsoft Defender for App Services Is Set To 'On' Verify that That 'Notify about alerts with the following severity' is Set to 'High'Verify that 'Additional email addresses' is Configured with a Security Contact EmailVerify that That Microsoft Defender for SQL Servers on Machines Is Set To 'On' Verify that That 'All users with the following roles' is set to 'Owner'Verify that That Microsoft Defender for Storage Is Set To 'On'

Verify that That 'Firewalls & Networks' Is Limited to Use Selected Networks Instead of All Networks

Framework Reference: A.8.20 Integration: Azure – Cosmos DB

Why this matters
Allowing Azure Cosmos DB accounts to be accessible from all networks — including the public Internet — significantly increases the attack surface. Restricting access to selected virtual networks ensures that only explicitly allowed traffic can reach the database, reducing the risk of unauthorized access and data exfiltration.

What this check does
This Auto Check verifies that Azure Cosmos DB accounts are configured to only allow traffic from selected networks.

Check Logic:
Passes if:

  • publicNetworkAccess = Disabled
    OR
  • publicNetworkAccess = Enabled AND isVirtualNetworkFilterEnabled = true

Fails if:

  • publicNetworkAccess = Enabled AND isVirtualNetworkFilterEnabled = false

This ensures that the database is not exposed to the public Internet and is restricted to a defined list of virtual networks.

How to fix it

Azure Portal:

  1. Go to the Azure portal
  2. Open the Cosmos DB blade
  3. Select the Cosmos DB account
  4. Click on Networking
  5. Under Public network access, select Selected networks
  6. Under Virtual networks, click + Add existing virtual network or + Add new virtual network
  7. For existing networks, select the subscription, virtual network, and subnet
  8. Click Add, then Save

Azure CLI:

az cosmosdb update \  --name <cosmosdb-account-name> \  --resource-group <resource-group> \  --default-action Deny \  --virtual-network-rules "[{id:'/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Network/virtualNetworks/<vnet-name>/subnets/<subnet-name>'}]" 

Confirm configuration:

az cosmosdb show --name <cosmosdb-account-name> --resource-group <resource-group> --query "isVirtualNetworkFilterEnabled" 

PowerShell:

Direct remediation via PowerShell is not explicitly defined in CIS. Use Azure CLI or Portal for enforcement.

Exceptions
None. Cosmos DB accounts should never be open to all networks.

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