See a step-by-step example of how SQL Injections happen. SQL Injection is a very old vulnerability — it has been discovered in However, according to our research, 8 percent of websites and web applications have SQL Injection vulnerabilities.
Read our full report on the current state of web security. A successful SQL Injection attack may lead to a complete compromise of a system or theft of the entire database. For example, an SQL Injection attack in led to the theft of complete tax data of 5 million people. Read more about the most massive SQL Injection attack in Acunetix is known to be top-of-the-line in detecting SQL Injections and other vulnerabilities. Acunetix is able to reach where other scanners fail. Find out what Acunetix Premium can do for you.
The best way to prevent SQL Injections is to use safe programming functions that make SQL Injections impossible: parameterized queries prepared statements and stored procedures.
Every major programming language currently has such safe functions and every developer should only use such safe functions to work with the database. Browse a library of safe functions for all programming languages.
Attackers can use SQL Injections to find the credentials of other users in the database. They can then impersonate these users. The impersonated user may be a database administrator with all database privileges. SQL lets you select and output data from the database.
An SQL Injection vulnerability could allow the attacker to gain complete access to all data in a database server. SQL also lets you alter data in a database and add new data. For example, in a financial application, an attacker could use SQL Injection to alter balances, void transactions, or transfer money to their account.
You can use SQL to delete records from a database, even drop tables. Even if the administrator makes database backups, deletion of data could affect application availability until the database is restored.
Also, backups may not cover the most recent data. Most applications allow their users to input data somehow, and web applications are no different.
Malicious individuals can abuse those data entering mechanisms in ways that interfere with the generation of SQL queries. Most of the time, these would be form fields and URL parameters. By tinkering with those elements in just the right way, attackers can inject—hence the name—additional SQL commands, which get executed. Imagine a real estate agency website. After selecting your search parameters and clicking on the Search button, the selected parameters get added as URL parameters.
Your URL would look something like this:. The query above is pretty straightforward. We want to retrieve the rows from the properties table in which the value of the category column is equal to Apartments. Since one always equals one, the query above successfully asks the database for properties from all categories.
The most important aspect of blocking SQL injections can be summed up in a single sentence: Always assume user input to be insecure. Also, any type of data provided by the user, such as form fields, URL parameters, or user-provided files should be automatically distrusted. Data from APIs your app consumes also go on that list. These examples are far from exhaustive, but the same rule applies: Consider user input unsafe by default. Verify it first, and only when you deem it safe should you proceed.
This tip might seem like general security advice that is applicable to a lot of different scenarios. How do you apply it specifically to the SQL injection issue? It starts when application development commences and extends all of the way through production. Contrast Security is the leader in modernized application security, embedding code analysis and attack prevention directly into software. This eliminates the need for disruptive scanning, expensive infrastructure workloads, and specialized security experts.
The Contrast Application Security Platform accelerates development cycles, improves efficiencies and cost, and enables rapid scale while protecting applications from known and unknown threats. Following are some of the scenarios: A bad actor hacker performs an SQL injection to delete data or tables from the database. Further, backups may not include recent data.
Attackers use SQL injection to alter or update data in the database and add additional data. For instance, in the case of a financial application, an attacker can use SQL injection to change account balances. Even worse, attackers can gain administrative rights to an application database. The most common risk of an SQL injection attack is the theft of user data.
Email addresses, login credentials, and personally identifiable information PII can be stolen and sold on the dark web. Therefore, a successful SQL injection poses a threat not only to the organization but also its users. Some of the most common SQL injection queries are included in the next section. Union-based SQL injection. Error-based SQL injection. The error-based SQL injection technique relies on error messages thrown by the application database servers.
Here, attackers use the error message information to determine the entities of the database. There are two types of blind or inferential SQL injection attacks: Boolean and time based. Boolean based. If not, they're denied access. Potential problems arise because most web forms have no way of stopping additional information from being entered on the forms.
Hackers can exploit this weakness and use input boxes on the form to send their own requests to the database. This could potentially allow them to carry out a range of nefarious activities, from stealing sensitive data to manipulating the information in the database for their own ends.
Because of the prevalence of web sites and servers that utilize databases, the SQL injection method of attack is one of the oldest and most widespread types of cyber assault. Several developments in the hacker community have increased the risk of this type of attack, most notably the advent of automated SQL injection programs.
Freely available from open source developers, automated SQL injection programs allow cybercriminals to automatically perform attacks in only a few minutes by allowing them to access any table or any column in the database with just a click and attack process.
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