What is SQL Injection?
An SQL injection is a computer attack in which malicious code is inserted into a poorly developed program and then distributed into the backend database. Followed is the malicious database query results or actions that should never have been performed. A successful SQL injection on a company may trigger an unauthorized representation of user lists, deletions of entire tables and the attacker, in some cases, to gain administrative database rights, all of which are highly damaging to a business.
SQL Injection Vulnerabilities Types
Attackers can exfiltrate server data in different ways by exploiting SQL Inject vulnerabilities. Some common methods are retrieving (true/false), error and timing-based data. Let’s look into the variants.
Boolean-Based SQL Injection
Sometimes, when a SQL query fails, a visible error message is not displayed on a page, and it is difficult for an attacker to obtain information from the vulnerable application. However, there is still a way to extract information. Sometimes when a SQL query fails, parts of the web page may change or disappear, or the entire site may not load. These indications allow attackers to determine if the input parameter is vulnerable and whether it provides data extraction. To test this, attackers insert a condition into a SQL query. If the page loads, it should be noted that it is vulnerable to a SQL injection, as usual. Certainly, an attacker typically attempts to produce false outcomes. If the condition is incorrect, it may mean that if the page doesn’t work as expected or if no result is returned, the page is vulnerable to SQL injection.
Error-Based SQL Injection
If you exploit an error-based SQL Injection flaw, attackers can extract data from observable database errors, including table names and text.
Time-Based SQL Injection
In some cases, while a vulnerable SQL query has no visible effect on the page output, information can be extracted from the underlying database. Hackers may assess this by instructing the database to wait a specific time to respond. If the page is not vulnerable, the loading will take much longer than usual if it is susceptible. In reality, this helps hackers to steal information, although the changes are not visible on the website.
Out-of-Band SQL Injection Vulnerability
There are also situations in which an intruder may access information from a database using out-of-band technology. These attacks usually involve directly sending the data from the database server to an attacker-controlled computer. Attackers could use this method if an injection does not occur directly after the data provided are inserted but at a later time.
Impacts of Vulnerability of SQL Injection
An attacker can do several things when a SQL injection is being used on a vulnerable website. This generally depends on the rights of the user the web app requires to connect to the database server. By exploiting the vulnerability of a SQL injection, an attacker will be able to:
- Write files to your database server
- Edit, add, delete or read content to the database
- Read the source code from the database server files
All this depends on the attackers’ abilities, but the exploitation of a SQL injection vulnerability can also lead to the full web server and database acquisition. An effective way to prevent damage is to restrict access as much as possible. It is good to have a wide range of databases for different purposes, for example, separating the shop system database and your website support forum.
Prevent SQL Injection Vulnerabilities Using Fixhackedwebsite
Getting web security tools is also a positive idea to avoid SQL injection vulnerabilities since manually locating SQL queries is often expensive and is likely to be missed. A strong web security tool helps verify this issue by checking every question thoroughly. Even if a vulnerable query is found, the web security tool guarantees the correct load of the web page by hiding queries from the database.
This can be done with Fixhackedwebsite, a tool created by Fixhackedwebsite for web protection. Download and take advantage of the following features to disable software vulnerabilities and protect websites and web applications from sophisticated attacks such as SQL Injection, Denial-of-Service (DDoS) and Cross-Site Scripting.
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