Fundamentals of InfoSecadvanced
Explain how a prepared statement with bound parameters prevents the core SQL injection problem, and name two additional protective practices.
Answer
A prepared statement keeps the SQL command structure separate from parameter values, so supplied input is treated as data rather than executable SQL. Additional protections include input validation and type checks, limiting database privileges, protecting sensitive data, and avoiding detailed error disclosure.
Explanation
### What a good answer covers
- Unsafe input handling can let user text become part of a database command.
- A prepared statement separates the command from parameter values.
- Bound values are treated as data rather than executable query structure.
- Additional controls include validation, type checks, least privilege, and careful error reporting.
### The concept
SQL injection is an application-level input-handling flaw. Filtering words or punctuation is fragile because it tries to recognize every dangerous form. Parameterization instead changes how the database receives the input. Limiting database privileges reduces potential harm if a vulnerability remains.
### Terms
- **SQL injection**: changing database command meaning through unsafe input.
- **Bound parameter**: a value supplied separately to a prepared query.
- **Least privilege**: giving a component only the permissions it needs.
### Remember
Parameterization prevents user values from becoming query structure.
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