Which SQL injection example illustrates an end-of-line comment technique?

• A. Fuzzing
• B. End of Line Comment
• C. Threat Modeling
• D. Risk

Answer: (B)

The technique tested is using an end-of-line comment in SQL injection, where the attacker injects a comment marker to terminate the rest of the SQL statement. By appending a comment after injecting a condition, the remainder of the original query is ignored, which can bypass authentication or other checks.

Example: a login query might be built as SELECT id FROM users WHERE username = 'user' AND password = 'pass'; If the input for the username is ' OR 1=1 --, the final query becomes SELECT id FROM users WHERE username = '' OR 1=1 -- AND password = 'pass'; The -- starts a comment, so everything after it is ignored, and the condition OR 1=1 is always true, potentially granting access.

This is distinct from fuzzing (randomly testing inputs to discover vulnerabilities), threat modeling (identifying potential threats in a system design), or risk (evaluating the impact and likelihood of threats). The end-of-line comment technique specifically demonstrates how SQL comment syntax can alter a query’s logic.