: This attempts to "break out" of the developer’s intended code by closing a data field and a function.
Here is a look into what that string is designed to do and why it’s a fundamental concept in web security. What is this string? : This attempts to "break out" of the
: Attackers use NULL to figure out exactly how many columns the original database table has. If the number of NULL s matches the columns, the page loads; if not, it crashes. : Attackers use NULL to figure out exactly
It looks like you've included a in your request. In the world of cybersecurity, that specific snippet is a classic example of an "Union-based" attack. In the world of cybersecurity, that specific snippet
: This is the heart of the attack. It tells the database to combine the results of the original (legitimate) search with a new set of data the attacker wants to see.
If a website is vulnerable to this, an attacker doesn't just stop at NULL . They eventually replace those NULL s with commands to extract sensitive info—like your —and display them right on the screen where the "Keyword" results should have been. How Developers Stop This
The text ') UNION ALL SELECT NULL,NULL...-- is a malicious payload used to test for vulnerabilities in a database.