: This is used to combine the results of the original query with a new query, often used to extract data like usernames or passwords.
: This is used to balance the syntax at the end so the database doesn't throw an error, making the injection "clean." Why This Matters
: A WAF can detect and block common patterns like sleep() or union select before they even reach your server.
Specifically, this is a attempt. The goal of this specific string is to force the server to "sleep" (pause) for a set amount of time, allowing an attacker to confirm if the input is being executed directly by the database. Breakdown of the Payload
: This is the core of the attack.
If the website takes exactly 2 seconds longer than usual to load, the attacker knows the site is vulnerable to SQL injection. :
: These are comment tags used to bypass basic security filters that might block spaces.