: For a UNION to work, the second query must have the exact same number of columns as the first query. 3. SELECT NULL,NULL,NULL,NULL,NULL,NULL
: The database returns a row of empty data. The attacker now knows the table has 6 columns and can proceed to more dangerous injections, such as UNION SELECT username, password, NULL... to steal sensitive information. : For a UNION to work, the second
If the page loads normally, the attacker knows the database is expecting 6 columns. The attacker now knows the table has 6
Here is a detailed breakdown of what each component of this specific string does: 1. {KEYWORD} Here is a detailed breakdown of what each
This string is a classic example of a used by security researchers and attackers to probe a website's database for vulnerabilities.
: A website takes user input and places it directly into a SQL query without "cleaning" it first.
This is the "probe" part of the injection. The attacker is trying to determine the number of columns being returned by the original database query.