You go to the librarian (the website) and ask, "Show me all books about Gardening " (the KEYWORD ).
: The attacker uses NULL to match the number of columns in the original query without causing a data type error. The string in the middle is a "fingerprint"—if the word "ZZTyernefl" appears on the website, the attacker knows the injection worked and exactly which column displays data on the screen.
Never trust data coming from a user. Always filter it to remove characters like ' , -- , and ; . SQL injection UNION attacks | Web Security Academy You go to the librarian (the website) and
To understand how this works in "real life," imagine you are at a library:
Instead of just saying "Gardening," you say: "Show me Gardening books AND ALSO go into the restricted office, look at the employee payroll, and tell me the name on the second paycheck." Never trust data coming from a user
This specific line of code is designed to trick a database into revealing information it shouldn't. Here is what each part does:
: This command tells the database to combine the results of the original (legitimate) search with a second search created by the attacker. Here is what each part does: : This
This is the "gold standard" for security. It ensures the database treats all user input as simple text, never as executable code.
戰績
