The common WordPress SQL injection is the second topmost attack in WordPress. The SQL injection is a type of attack that used to inject malicious code into existing SQL statements. We all know that every WordPress site has an individual database. This attack enables malicious users into the web application to gain unauthorized access modify and extract data, sensitive data, personal information, or destroying data. And also used this attack, the attacker can gain complete control over affected websites, applications, and database servers.

How does SQL injection attacks works

Usually, SQL injection attacks performed through web pages or application input. To perform an SQL injection attack, attackers can use anything from contact forms to sign up forms, from login forms or even the search bar.Most of the time for this attack, attackers need to identify vulnerabilities within a web page or application. After finding a target, attackers create malicious payloads and emit their input content material to execute malicious commands.

Types of SQL injection attacks

In-band SQL injection attacks:

In this attack, the attackers try to insert the malicious SQL code into the application and steal information from the database like user credentials.

Union-based SQL Injection:

This technique used to extract data from the database and here use UNION SQL operators to integrate two SELECT statements into a single result.

Blind SQL injection:

In this type of attack, the attacker retrieves information from the database and interrogates the database true or false questions and determines the answer based on the response of the application. Usually, this attack occurs when the web application is configured to show generic error messages.

Boolean-based SQL injection:

Generally, this attack used in permission or authentication queries, and also this type of attack overwrites the logic and conditions of the query to its own.

Error-based SQL injection:

In this techniques used error message where error message returns full query results and reveal confidential information from the database.

Time-based SQL injection:

When attackers failed to retrieve information from a database server and then applied time-based SQL injections to achieve their results. This attack used when determining if vulnerabilities are present on a web application or website.

Impact of a SQL injection Attack

Loss of data:

If a typical hacker gets unauthorized access to exploit SQL injection. They can delete sensitive information . if remove your website data which is you never recover.

The exploitation of sensitive data:

Database stored sensitive information such as user credentials, debit, or credit card number et cetera that can be stolen. Using these hackers can do terrible damage.

Performance declining:

If your website containing a malicious script that means when you run your website this malicious script will execute as a result your website falling performance.

Falling SEO rankings: 

If your website injected by malware and then google reduce SEO ranking of affected website.

Tarnished reputation:

When a user wants to visit a specific website but it redirects another website as a result, your website reputation will be ruined.

Being blacklisted and suspended:

If your website hacked and then hacked websites to be blacklisted by website security authorities such as Norton, Google. And also suspend, by hosting provider because, when one site gets hacked, it’s very likely that other websites on the same server could be hacked

How to prevent SQL injection attacks

Keep your website up to date:

To prevent this attack you must need to keep the website updated. When you skip update of your website, outdated software there have vulnerabilities and attacker use this vulnerabilities easily exploited to launch an SQL attack on your website. Updated software fixes security issues and also adds new features and improves performance.

Don’t use pirated software:

If you are used any pirated software, immediately remove it. Because pirated software has hidden backdoors and adds malicious script that enables attackers, and uses this attacker to get unauthorized access to the website.

Use WAF:

You can secure against generic SQL injection with a web application firewall. By separating possibly risky web demands, web application firewalls can get and forestall SQL infusions

Change database prefix:

Most of the user never change the database prefix because they ignore it and just install with the default setting. An attacker can easily guess the database prefix and exploit SQL injection techniques. Change database prefix that will make much harder for an attacker to use database

Input validation:

Input validation test user input against an existing set of known, approved, and defined input. Whenever data is received it doesn’t match the assigned values then it rejected and protect from malicious SQL injections in the process.

Daily scan your website:

Everyday sixty thousand plus WordPress website are hacked. Anyday hackers successfully inject malware into your database. That’s why you need regular monitoring and scanning. Scan your website

What to do if your website has been hacked by SQL injection

Identify the vulnerable code:

If your website affected by the SQL injection. The first step recovers from this attack, you need to identify where the vulnerability is located and finally remove it. You can manually scan using a tool such as Havij, SQLmap, or jSQL to identify vulnerable code.

Remove injected content and backdoors:

When you have acquired data about the area of the malware, remove malware, and the malicious script from the database. You’ll also need to check the file system for backdoors.

Patch the vulnerability:

When you obtain in this attack you just need to identify the vulnerable software, apply patches and updates to the vulnerable code along with any other outdated components.

Update your data:

When a compromise occurs, it is important to alternate all your passwords and application secrets and techniques as soon as the vulnerability is patched. Prevent reinfection by cleaning up your information to make certain that there are not any rogue admin customers or backdoors present within the database.

Set up WAF:

When you set a web application firewall and it provides protection against new vulnerabilities and protects SQL injection attack.