This is the primary defense. It ensures that user input is treated as data, not as executable code [4].
: This is the malicious command. It instructs the database to pause or "sleep" for 5 seconds before responding to the query [2, 3]. {KEYWORD}');SELECT SLEEP(5)#
If the payload works, an attacker can replace SLEEP(5) with more complex queries (e.g., IF(SUBSTRING((SELECT password FROM users),1,1)='a', SLEEP(5), 0) ) to extract data character-by-character based on whether the server pauses [3]. Security Implications This is the primary defense
Ensure the database user account used by the web application has limited permissions. It instructs the database to pause or "sleep"
Here is a detailed breakdown of what this payload does and why it is used. Breakdown of the Payload
: This is a comment character in MySQL. It tells the database to ignore the rest of the original SQL statement, ensuring the injected command doesn't cause a syntax error [1]. Purpose: Blind SQL Injection
: This attempts to prematurely close the original, legitimate SQL query statement intended by the developers [2].