Description

{AzureSqlDbServer}, SQL Database Server, allows ingress any ip (0.0.0.0/0). SQL Server includes a firewall that allows to define which connections are authorized and unauthorized. By default, for a SQL Server, a Firewall exists with StartIp of 0.0.0.0 and EndIP of 0.0.0.0 allowing access to all the Azure services. Additionally, a custom rule can be set up with StartIp of 0.0.0.0 and EndIP of 255.255.255.255 allowing access from any ip over the internet. In order to reduce the potential attacks of a SQL server, firewall rules should be defined with more restricted ip addresses by referencing the range of addresses available for a specific SQL Server.

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  Recommended Mitigation

  For each SQL server, click on Networking and disable public access or edit the firewall rules to limit access to only authorized connections.