SQL Injection

SQL injection is a very common hacking method amongst businesses that are dependent on websites or applications, where they don't thoroughly check what their audiences are entering into the login forms or search bars. This attack is very easy to do for websites that aren’t properly protected. Even some of the big businesses and government organisations have fallen prey to this method and lost their valuable data, lost customer trust, and ended up facing huge financial losses. 

That is why it is so important to understand this modern hacking method before too many people start misusing it. This guide will help readers understand what an SQL injection is in detail and the steps to prevent it. This will help you take more initiative and effort towards protecting your website from malicious attacks.

What is an SQL injection? 

It is a type of cyberattack in which hackers use corrupted code and inject it to interfere with the entire database of a webpage or an application. An SQL injection gives access to information that hackers are not even able to view or retrieve. In most cases, the attacker only copies the information; however, in extreme situations, they tend to modify or completely delete it from the base program to cause a change or damage in the computer's content or behaviour. 

An SQL injection is a serious problem when building a web-based app. It happens when a website accepts unsafe input from users. The input is then used in a database query. An attacker can type symbols like (‘), (“), (=), or (--) into a form on the site. These symbols change how the site talks to the database. When used with commands like SELECT, FROM, or DELETE, they can fool the system. As a result, the attacker may be able to see or steal private data.

Ways to prevent SQL injection attacks

As mentioned, SQL injection is a very common way hackers break into an application or website. However, there are ways in which this attack can be stopped. By being extra cautious and taking some simple steps, developers can definitely protect their domains from these attacks. There are also other ways, such as safety coding practices and by choosing the right tools, that they can keep their digital spaces secure. 

This section will highlight a few ways in which programmers can stop SQL injection attacks if they are implemented correctly. It will give them an idea of how to take the necessary steps during unexpected situations to keep their digital products safe from hackers. 

Use prepared statements

This keeps the user input and the SQL code completely separate. So, if someone types something harmful, it won’t work. This is because placeholders treat the input as separate data, not as part of the code. For example, if a hacker enters something dangerous in a login form, prepared statements will block it. They recognise it as outside input, not as a code extension.

Always check and clean the user input 

Always check what the users are typing, in case of expectations for only numbers or letters. If you want only numbers, make sure you block the use of alphabets, and in case of only alphabets, make sure you block the use of any foreign symbols such as (‘), (“), or (- -). These checks protect your webpage or application against potential SQL injection by preventing harmful data inputs from reaching the database.

Use stored procedures

Stored procedures are like reserved recipes for the code in the database. Rather than writing the code again and again, the website or application uses pre-written code instructions. As a result, it doesn't change based on different data inputs or whatever the user types, which makes it harder for them to attack and view confidential information. 

Regular updates 

Outdated applications and webpages are more vulnerable to their database being exploited by hackers. This is because they are more sensitive towards safety due to the patches in the system. Their regular updates are the best way to fix these patches and create a stronger security that prevents SQL injection attacks.

Avoid showing complete Error messages to your audience

If your homepage displays a large error message, it can reveal details about your database and help hackers learn how your system works. Instead, display a simple message like “Sorry, something went wrong with our system,” and keep the full error details hidden from public view.