: The attacker is trying to append their own results to your original database query.
: This is SQL shorthand to comment out the rest of the legitimate code, ensuring the injected command runs cleanly. The "DJGP" Element
: They use "NULL" to figure out exactly how many columns your database table has without triggering a data-type error. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL-- DJGP
You don’t have to be a security wizard to stop this. The "Golden Rule" of modern web dev is simple:
If you’ve spent any time looking at server logs, you’ve probably seen it: a weird string of keywords like UNION ALL SELECT NULL . It looks like gibberish, but it’s actually an attempt to speak directly to your database behind your back. What is this string? : The attacker is trying to append their
Seeing {KEYWORD} UNION ALL SELECT in your logs is a reminder that the internet is always "knocking on the door." By using modern coding practices, you make sure that door stays locked.
If you expect a zip code, don't accept a string that starts with UNION . You don’t have to be a security wizard to stop this
Tools like Sequelize, Eloquent, or Entity Framework handle much of this protection for you by default. The Bottom Line