How Can Parameterized SQL Statements Prevent SQL Injection in INSERT Statements with Textbox Comments?

Mitigating SQL Injection Risks in INSERT Statements with Textbox Comments

Despite its restricted access within the company's intranet, your survey web page faces potential risks from SQL injection attacks, even in the context of inserting comments from a textbox.

SQL injections arise when untrusted user input is directly incorporated into SQL statements. Consider an INSERT statement that adds a comment to a table:

INSERT INTO COMMENTS VALUES (122, 'I like this website');

Imagine if a user entered the following malicious comment:

'); DELETE FROM users; --

If this comment were inadvertently inserted into the SQL statement without any processing, it would effectively execute two actions:

INSERT INTO COMMENTS VALUES (123, '');
DELETE FROM users; -- ');

This attack would result in the deletion of all user data in your users table. To prevent such security breaches, it is crucial to employ parameterized SQL statements.

In .NET 2.0, you can utilize the SqlCommand.Parameters collection to create parameterized SQL statements. These parameters act as placeholders for user-supplied values, ensuring that the input is processed and handled securely.

using (SqlCommand cmd = new SqlCommand("INSERT INTO COMMENTS VALUES (@id, @comment)"))
{
    cmd.Parameters.AddWithValue("@id", 122);
    cmd.Parameters.AddWithValue("@comment", userInput);
}

By using parameterized SQL statements, you can safeguard your INSERT statements from malicious user input and maintain proper coding practices, protecting the integrity of your data.

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