SQL Injection Defense Mechanisms: Replace

This is the internal directory system of RiRiLa Company, a common enterprise system powered by a database. You can input an employee ID to retrieve related information. Use this system to practice SQL Injection techniques.

Due to repeated SQL Injection attacks, the developers have implemented a hidden protective mechanism. Your challenge is to bypass this defense.

Your goal is to retrieve the result of the query SELECT flag FROM flag, where the flag content is the answer to this challenge.

Tips

• If you suspect a hidden defense mechanism, test by substituting potential keywords to identify restricted patterns.
• Analyze error messages from the system for clues about content being replaced or specially handled to guide your bypass strategy.
• Common bypass techniques include equivalent symbols (e.g., || instead of OR), logical substitutions, and case variations (e.g., UnIOn).