Websites use a special language called SQL to ask the filing cabinet for information. It is like sending a precise written request to a clerk.

Talking to the Database

This attack happens when a hacker adds their own secret instructions into a website's text box. The website then accidentally sends those instructions to the filing cabinet.

The Sneaky Command Trick

Hackers can use a trick that makes a login form always say 'True.' This allows them to enter any account without knowing the real password.

Bypassing the Login Screen

By sneaking in a command, a hacker can tell the database to list every single user's email and password. This is how many large data breaches happen.

Stealing Your Private Data

Hackers can use commands to stitch a malicious request onto a normal one. This lets them grab secret data from files they shouldn't be allowed to see.

The Danger of Joining Data

Some malicious commands can tell the database to wipe itself clean or delete specific tables. This can cause a website to lose all its customer information instantly.

Deleting Important Files

Sometimes a hacker can guess information just by watching how long a website takes to load. This slow and steady method is often called a 'blind' attack.

Hacking in the Dark

This is a top defense that keeps the website's instructions separate from the user's input. It tells the database to treat whatever the user types only as plain text.

The Fill-in-the-Blank Method

This means giving the website only the minimum access it needs to do its job. If a hacker breaks in, they will be stuck in one 'room' and cannot access the whole system.

The Least Privilege Rule

This process, also called validation, makes sure the user only types what is expected. For example, it ensures that a 'Phone Number' box only contains numbers and no code.

Checking the Guest List

Websites should never show detailed database error messages to regular users. These messages can give hackers 'blueprints' on how to break in more easily.

Hiding Technical Clues

A Web Application Firewall is a tool that sits in front of a website and inspects incoming traffic. It acts like a filter to catch and block known hacking attempts.

The Digital Security Guard

Simply trying to block 'bad words' usually doesn't work because hackers find clever ways to disguise them. It is much safer to only allow specific 'good' patterns.

Why Banning Words Fails

No single tool is perfect, so pros use many different safety checks at once. If one defense fails, the others are still there to protect the data.

SQL Injection & Prevention Concepts