Cis Azure Database 5.3

5.3 Ensure 'Public Network Access' is 'Disabled' for Azure Database for MySQL (Automated)

Profile Applicability

• Level 2

Description

Setting public networks to disabled prevents requests from the public internet.

Rationale

Disabling public network access prevents Azure Database for MySQL servers from communicating with the public internet and requires the use of Private endpoints for granular network control and segmentation.

Impact

Disabling 'Public Network Access' forces the requirement of the use of Private Endpoints for network connectivity which will require some additional consideration from a network architecture perspective and will introduce cost based on the inbound/outbound data being processed by the Private Endpoint.

Audit

Audit from Azure Portal

1. From Azure Database for MySQL select the database you wish to audit.
2. In the left column expand > Settings.
3. Select Networking.
4. Ensure that Public network access is not selected.

Audit from PowerShell

1. Run the following command with the identifying details for your subscription.

Get-AzMySqlFlexibleServer -name <servername> -ResourceGroupName <resourcegroupname> | Select-Object -property NetworkPublicNetworkAccess

2. Ensure that Public network access is Disabled.

Audit From Azure Policy

If referencing a digital copy of this Benchmark, clicking a Policy ID will open a link to the associated Policy definition in Azure.

If referencing a printed copy, you can search Policy IDs from this URL: https://portal.azure.com/#view/Microsoft_Azure_Policy/PolicyMenuBlade/~/Definitions

• Policy ID: c9299215-ae47-4f50-9c54-8a392f68a052 - Name: 'Public network access should be disabled for MySQL flexible servers'

Expected Result

Public network access should be Disabled for the Azure Database for MySQL server.

Remediation

Remediate from Azure Portal

1. From Azure Database for MySQL select the database you wish to audit.
2. In the left column expand > Settings.
3. Select Networking.
4. Uncheck the checkbox under Public Access.

Default Value

Unless specified at resource creation, Azure Database for MySQL by default allows public network access, but authenticates requests.

References

1. https://learn.microsoft.com/en-us/azure/mysql/flexible-server/how-to-networking-private-link-deny-public-access

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