Last Updated on May 26, 2023 by SWHA

As more business activities move online, securing your website from cyberattacks is crucial. One of the most popular attacks on web applications is SQL injection. It is an attack in which malicious actors insert malicious code into SQL queries, tricking the server into executing unauthorized commands or accessing sensitive data.

What is SQL Injection Attack

SQL Injection Attack is a type of code injection that targets the databases of websites. Now, before you start panicking, let’s break that down.

A database is essentially an organized set of data that a website needs to function. This data, including names, addresses, and other sensitive information, is stored in a database. Web applications, like eCommerce sites, use Structured Query Language (SQL) to communicate with the database.

So, what happens during a SQL Injection Attack?

Hackers use malicious code to inject SQL commands into the website’s input forms. This enables them to gain access to sensitive data or take control of the website entirely. Once an attacker has access to the data, they can do many things, like modify, read, or delete data, create new accounts or manipulate the behaviour of an application.

How does SQL Injection attacks work

These attacks are a type of cybersecurity threat that exploits vulnerabilities in web applications. Hackers use malicious code to inject SQL (Structured Query Language) statements into a website’s database, giving them access to sensitive information or the ability to manipulate data.

So how does this attack work?

SQL Injection Prevention - Post 1 - 2It starts with a vulnerable web application. Hackers will use search engines to find websites that are susceptible to SQL injection attacks, and then they’ll look for forms or other input fields that they can exploit. Once they find one, they’ll input specially crafted code that tricks the web application into executing SQL commands.

These SQL commands, which are often referred to as “injected code,” give hackers access to the website’s database. They can use this access to steal sensitive information, such as usernames and passwords, or to modify data in the database.

One of the most common ways that hackers use SQL injection attacks is to create malicious queries that exploit vulnerabilities in the application’s code. For example, they may enter a command that allows them to see all the data in a particular database table which including data that should be kept private. Or they may use the attack to alter data in the database, such as modifying user account settings or changing order details.

These attacks can be devastating for website owners and users, as they can lead to data breaches, identity theft, and other serious consequences. To protect your website from these attacks, it’s important to implement strong cybersecurity measures, including regular security audits and updates, use of secure coding practices, and ongoing monitoring of your website’s security posture.

By understanding how SQL injection attacks work and taking steps to mitigate the risk, you can help protect your website and your users from this serious security threat.

SQL Injection Prevention Best Practices

It is a common form of attack that can lead to data breaches, compromised user accounts, and serious consequences for businesses. To prevent SQL injection attacks, it’s essential to implement best practices for database security. Here are a few tips to help you keep your database safe:

1. Use Parameterized Queries

To prevent SQL injection attacks, web developers need to implement several best practices. One of the most important of these is to use parameterized queries. We will explore how using parameterized queries can help prevent the attacks.

What are Parameterized Queries?

Parameterized queries, also known as prepared statements, are SQL statements that use placeholders for user input. Instead of using the actual input values directly in the SQL statement, the placeholders are used to represent the input values. These placeholders are then bound to the actual input values using a binding process.

For example, a parameterized query for inserting user details into a user table might look like this:

INSERT INTO user (username, password, email) VALUES (?, ?, ?);

In this query, the placeholders “?” represent the input values for the username, password and email. The actual input values are bound to these placeholders through a binding process by the web application.

Why Use Parameterized Queries?

Using parameterized queries provides several benefits in terms of SQL injection prevention:

a. Protection Against SQL Injection Attacks

Parameterized queries prevent the attacks by separating SQL commands from user input. Since the input values are not directly concatenated into the SQL statement, attackers cannot inject malicious SQL code into the statement.

b. Improved Performance

Using parameterized queries can also result in improved performance. Since the database only needs to parse the SQL statement once, it can reuse the parsed statement multiple times with different input values, reducing overhead.

c. Easy Maintenance

Parameterized queries make it easy to maintain SQL statements. Instead of modifying SQL statements directly, developers can simply modify the statement’s input parameters.

SQL Injection Prevention - Post 1 - 32. Sanitize User Input

SQL injection attacks have been around for more than two decades now, and they still pose a significant threat to websites and businesses worldwide. Any application or website that uses an SQL database to store user data, such as login credentials or personal information, is at risk. To prevent cyberattacks, one of the best practices is to sanitize user input as soon as it is received.

What is Sanitizing User Input, and Why is it Important?

Sanitizing user input means validating and cleaning up the data received from a user before using it to interact with the database. It involves checking the data type, format, and length to ensure that it adheres to the expected input format.

This process removes potentially harmful code, such as SQL statements, and prevents attackers from exploiting database vulnerabilities.

Sanitizing user input is crucial because attackers can use SQL injection attacks to bypass security measures and perform malicious actions. They can steal sensitive data, modify or delete database records, or even take over the entire system.

Sanitizing input helps prevent these attacks by validating user input before it reaches the database and eliminating any malicious code that may be included.

How to Sanitize User Input?

To sanitize user input, you can use several techniques, including:

a. Parameterized Queries

This method involves using placeholders in SQL statements to separate data input from commands sent to the database. You can use prepared statements or stored procedures to make it easier to implement this technique.

b. Whitelist Input Validation

This method involves defining a list of acceptable characters or patterns for input data. Any input that does not match the whitelist criteria is rejected.

c. Escape Special Characters

This method involves escaping any special characters that may be part of user input. This way, even if attackers inject malicious code into the input, the database will ignore it.

d. Use Frameworks and Libraries

Many programming languages, such as PHP and Java, have built-in libraries and frameworks that simplify the process of sanitizing input. You can use them to reduce the risk of human error when implementing input validation.

Sanitizing user input is a critical step in preventing the attacks. It helps protect your website or application from malicious attacks and ensures the security of user data.

While it may seem like an additional step, the benefits far outweigh the effort involved. By implementing these best practices today, you can safeguard your data and keep attackers at bay.

3. Avoid Dynamic SQL

Dynamic SQL is a feature in SQL that allows you to generate SQL statements at runtime. While it can be useful in certain cases, it can also be a potential weak point for SQL Injection attacks. Dynamic SQL should be avoided in favor of safer alternatives.

There are several reasons why you should avoid Dynamic SQL.
– It makes it easier for hackers to inject malicious code into your SQL queries.

– It can lead to performance issues, as Dynamic SQL is more difficult for the database to optimize.

– It can be challenging to debug, as the SQL statement is not known until runtime.

To avoid Dynamic SQL, you should use parameterized queries. Parameterized queries are pre-compiled SQL statements that take in parameters at runtime. This ensures that the SQL statement is secure and that the parameters are sanitized before they are included in the query.

Another best practice is to use stored procedures. Stored procedures are pre-written SQL code that can be executed by a database. They are stored on the database server, making them more secure than Dynamic SQL, which is stored on the application server.

4. Limit Database Permissions

Limit database permissions is a simple yet effective way to prevent attackers from gaining access to sensitive data. By doing so, you reduce the potential for SQL injection attacks on your database. Here’s why limiting database permissions is so important:

a. It Reduces The Attack Surface

The less access an attacker has to your database, the less opportunity there is for them to exploit vulnerabilities. By limiting database permissions to only essential tasks, you can reduce the attack surface, making it harder for attackers to infiltrate your systems.

b. It Helps Prevent Accidental Damages

Limiting permissions helps prevent accidental data loss or corruption. For example, if a user doesn’t have the appropriate permissions, they won’t be able to delete valuable data or update critical information that could cause problems later on.

c. It Increases Security

By limiting permissions, you can improve and increase security by making it harder for attackers to access sensitive data. Even if an attacker gains access to your system, if they don’t have the necessary permissions, they won’t be able to do much damage.

d. It Helps Meet Compliance Regulations

Many industries have strict regulations governing the handling of sensitive data, such as healthcare and financial services. By limiting database permissions, you can help meet compliance regulations, which can help reduce the risk of fines and penalties.

Limit database permissions is a crucial aspect for the prevention best practices. Always remember that prevention is better than cure, and it’s always better to be safe than sorry. Implementing proper database permissions is just one step in securing your database and protecting your organization from malicious attacks.

SQL Injection Prevention - Post 1 - 45. Use WAF

One of the most effective ways to protect against SQL injection is to use a Web Application Firewall (WAF).

What is a WAF?

A Web Application Firewall is a security solution designed to protect web applications from various cyber threats, including SQL injection attacks. A WAF is placed in front of a web application and acts as a middleman between the user and the application, analyzing each incoming request and filtering out any potentially malicious traffic.

Why Use WAF for SQL Injection Prevention?

Implementing a WAF can be a great approach to cyberattacks prevention for the following reasons.

a. Automatic Detection and Prevention

A WAF can help automatically detect and prevent these attacks without any human intervention. By using advanced algorithms, machine learning and rules-based engines, It can analyze incoming traffic in real-time and filter out any requests that could potentially be harmful.

b. Continuously Updated Rules

They are continuously updated with new rules and signatures developed by security experts to identify new SQL injection attack patterns. With regular updates, WAFs stay ahead of emerging cyber threats.

c. Reduce False Positives

It can help reduce false positives by analyzing traffic more accurately than standard security controls. WAFs look at various factors, including the source of the traffic, the application, and the behaviour of the traffic, to eliminate the risk of false positives.

d. Cost-Effective Solution

A WAF can be a cost-effective solution for SQL injection prevention, as it requires minimal hardware and installation costs. Additionally, it can be deployed on-premise or via cloud-based solutions, providing greater flexibility.

To effectively use a WAF for SQL injection prevention, consider the following best practices.

a. Choose the Right WAF Solution

Choose a robust WAF solution with the ability to automate security policies and integrate with your existing security infrastructure.

b. Regularly Update and Configure WAF

Regularly update and configure your WAF based on the latest security threats and the changing needs of your organization.

c. Use SSL Encryption

For added security, use SSL encryption to secure communication between the user and the web application.

d. Train Staff

Train your employees on the importance of the prevention and security best practices to prevent cyber-attacks.

However, by implementing best practices, such as using a WAF, you can better protect your website or web application from these attacks.

6. Use a Stronger Password Hashing Algorithm

Password hashing is a crucial aspect of application security that should not be taken lightly. The world of cyber threats is evolving rapidly, and a weak password hashing algorithm can easily become vulnerable to password cracking techniques.

Therefore, it is essential to use a stronger password hashing technique that can protect your data against such security threats. Here are some best practices to guide you in implementing an effective password hashing technique.

What is Password Hashing?

Password hashing is a security technique that involves converting a plain text password into a hash value. It is done using a one-way function that transforms the password into a fixed-length code. The purpose of password hashing is to protect user passwords by ensuring that even in the event of a data breach or SQL injection attack, the attacker cannot obtain the actual password.

Select a Stronger Password Hashing Algorithm

The most critical aspect of password hashing is selecting a strong hashing algorithm that can resist password cracking techniques.

Password hashing algorithms such as MD5, SHA-1, and SHA-2 are not recommended for password storage since they are vulnerable to hacking techniques, and brute-force attacks.

It is best to use a stronger password hashing algorithm like Argon2, bcrypt, and scrypt, which is designed to be slow and computationally intensive. It makes it harder for an attacker to crack the hash value since it takes longer to compute the hash.

Argon2 is considered to be the winner of the Password Hashing Competition (PHC) organized by the US National Institute of Standards and Technology (NIST). It’s a memory-hard algorithm that makes it difficult for attackers to use parallel computing to crack passwords.

Bcrypt, on the other hand, is an adaptive algorithm that can be adjusted to take longer to compute as computer hardware continues to get faster.

Scrypt is another memory-hard algorithm that’s designed to be ASIC-resistant, meaning it can’t be easily cracked using specialized hardware.

SQL Injection Prevention - Post 1 - 5Salt your Passwords

Adding salts to your passwords can enhance the security of your password storage. A salt is a random string of characters added to the password before hashing.

The salt value should be unique for each password, making it harder for attackers to use precomputed hashes to guess the password. Salting your passwords make it more difficult for attackers to crack passwords using a technique called Rainbow table attack.

Change your Hashing Algorithm

It’s essential not to get too comfortable with your password hashing algorithm. With the invention of new hacking techniques, your currently strong hash may become vulnerable after a while.

Therefore, it is recommended that you reevaluate your current password hashing algorithm regularly. Stay up to date with the latest threats and consider changing your hashing algorithm to one that provides better security.

7. Keep Your Software Up-to-Date

To prevent these attacks, one of the best practices is to keep your software up-to-date. Software companies release regular updates to fix security vulnerabilities and bugs that can be exploited by hackers. Therefore, if you’re not keeping your software up-to-date, you’re leaving your system exposed to potential attacks.

It’s not just your operating system that needs to be updated regularly. Your web server, CMS, plugins, and other third-party software should also receive regular updates. Using outdated software is like leaving your front door open and it’s an invitation for hackers to come in.

Apart from helping to prevent SQL injection attacks, keeping your software up-to-date also has other benefits. Updates often come with improved features, better performance, and ease of use.

These upgrades can help your business run more efficiently, provide a better experience for your users, and in some cases, can save you money.

There are times when updating your software is not always smooth sailing. Some updates can cause compatibility issues with other programs or plugins, resulting in more downtime than you would want. In such cases, it’s advisable to test the updates on a staging site before deploying them on your live site.

Don’t let hackers exploit vulnerabilities in your system because you failed to update your software. It’s a simple, yet crucial measure to follow. So the next time you see an update notification, hit that update button, and protect your business from cyber threats.


SQL injection attacks are one of the most prevalent and damaging types of cyber attacks. These attacks exploit vulnerabilities in your web applications, which can lead to data breaches, corruption or even outright theft. Such attacks can be easily prevented by using the prevention techniques.

In this article, we have covered some of the most effective prevention techniques to stop SQL injection attacks. You can implement these techniques to secure your data and systems from cyberattacks.

We hope that this article has been informative and helpful for you on the importance of protecting your web applications with prevention tools. It is important to keep in mind that prevention is always better than cure. As such, taking steps to secure your systems from cyberattacks should be a priority.

By implementing best practices for SQL injection prevention, you can protect your organization’s data, reputation and customers from cyberattacks. So, don’t wait until it’s too late, take action now to secure your web applications and data from these cyberattacks!