SQL Injection

[jpalanco]

The corrected code addresses the SQL Injection vulnerability by replacing dynamically constructed SQL queries with parameterized queries using PreparedStatement. This approach prevents SQL injection attacks by separating SQL code from data, ensuring that user input is treated as data only and not executable code.

Key Changes:

1. Use of PreparedStatement:

   • The code now uses PreparedStatement for executing SQL queries. This allows for the use of placeholders (?) in the SQL statements, which are then replaced with actual values using the set methods (e.g., setInt, setString, setBigDecimal).

2. Parameterization of Queries:

   • Each SQL query now includes placeholders for the values that were previously concatenated directly into the SQL string. For example, the INSERT INTO TRANSACTIONS query now uses placeholders for ACCOUNTID, DATE, TYPE, and AMOUNT.
   • The UPDATE ACCOUNTS queries also use placeholders for BALANCE and ACCOUNT_ID.

3. Separate Statements for Different Operations:

   • Separate PreparedStatement objects are created for different operations, such as inserting transaction records and updating account balances. This improves code readability and maintainability.

Benefits:

• Security: By using parameterized queries, the risk of SQL injection is mitigated, as the database engine treats input values as data rather than executable code.
• Maintainability: The code is cleaner and easier to maintain, with clear separation between SQL logic and data values.
• Performance: PreparedStatement can improve performance by allowing the database to precompile the SQL statement, which can be reused with different parameters.

Additional Considerations:

• Ensure that all user inputs are validated and sanitized before being processed, even when using parameterized queries, to prevent other types of attacks such as XSS or logic errors.
• Regularly review and update database access code to adhere to best practices for security and performance.

Created by: plexicus@plexicus.com