Michael Howard of Microsoft put out a great post about how easy it is to inadvertently create massive security holes in the form of SQL Injection Vulnerabilities in your HTTP-accessible Azure Logic App by not using the ‘Execute a SQL Query’ action correctly. He also gives some simple examples of how to protect yourself in the process.
To summarize: if you are not using prepared statements or stored procedures, it is extremely trivial for an attacker to construct a query that does anything from truncate or drop tables, to changing data within the database, to getting full remote command execution using a command like SQL Server’s xp_cmdshell.
Please be extremely careful when you’re building your Logic Apps – they may be simple to build but that also means it’s just as simple to make a glaring security mistake that could cost your business time and money.
