Sql server login password strength
Applies to: 
SQL Server
This rule checks whether "Enforce password policy" of each SQL Server login is enabled. If SQL Server Authentication is enabled and if the operating system version is earlier than Windows Server 2003, an attacker could repeatedly exploit a known SQL Server login password.
Best practices recommendations
We recommend that you upgrade the operating system to Windows Server 2003.
If SQL Server Authentication isn't required in your environment, use Windows Authentication.
Enable "Enforce password policy" for all the SQL Server logins. Use ALTER LOGIN to configure the password policy for the SQL Server login.