Protecting Stored Procedures Against SQL Injection

Bert Wagner has a two-part series on SQL injection.  In the first post, he shows how to use sp_executesql to parameterize queries:

The important thing to note in the query above is that we are generating a dynamic SQL statement; that is, we are building the SQL query string, and then we are executing it.

Imagine this stored procedure is running in order to display a “Welcome <Full Name>!” message in our app — a website visitor types in their@ParmUserName and we execute the stored procedure to return their full name.

In his second post, Bert shows what to do if you need to run a query off of a dynamically-selected table:

Unfortunately we have to fall back on SQL’s EXEC command.

However, like we discussed last week, we need to be vigilant about what kind of user input we allow to be built as part of our query.

Assuming our app layer is already sanitizing as much of the user input as possible, here are some precautions we can take on the SQL side of the equation:

Read on for more.

Related Posts

Effective Identities And Power BI Embedded

Angela Henry shows how you can use Power BI Embedded for row-level security even when the accessing users don’t have Power BI accounts: Now that you familiar with Row Level Security in Power BI, how do you make it work when you want to pass in your customer’s identifier because your customers don’t have Power […]

Read More

Testing SQL Logins For Weak Passwords

Tom LaRock shows how you can test SQL authenticated logins for weak passwords using a built-in SQL Server function: DATA SECURITY IS HARD BECAUSE PEOPLE ARE DUMB. Don’t just take my word for it though. Do a quick search for “common password list” and you’ll see examples of passwords scraped from breaches. These are passwords […]

Read More

Categories

September 2017
MTWTFSS
« Aug Oct »
 123
45678910
11121314151617
18192021222324
252627282930