<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Structured Query Language (SQL) is a high-level language that interacts with relational databases like MySQL or Microsoft&rsquo;s SQL Server. It was designed to simplify the process of reading, writing, updating, and deleting data stored in these databases.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Visit for more information Best anime app



<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">A simple query to retrieve all of the users from a user table for example would be something like the following:



<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">All programming languages provide ways to create SQL queries, submit them to the database, and then handle the response.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">When writing an interactive application, you would take the input from a user and use that to carry out an operation on the database using SQL that is constructed using that input.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">For example, a user who is searching for a new computer may filter the search by asking to show only &ldquo;Gaming PCs&rdquo;. In a PHP application, the code to do this would look like:

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">The great thing about SQL is that it is an intuitive, easy-to-learn, and applied language.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Constructing queries is also very simple, you just create a string combining the SQL syntax with the parameters you received from the user.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Unfortunately, it is in this simplicity that the problem of SQL injection lies.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">So, you can create an SQL query easily by combining user input with other text using SQL syntax.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">However, if you don&rsquo;t check the user input, an attacker can potentially manipulate the final SQL query by crafting the input to alter what the SQL query does.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">So, instead of just returning the details of a specific user &ldquo;user1234&rdquo; as in the example above, the attacker can modify the query to return all of the users in the user table.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">We will cover this in more detail, with examples, but it is important to realize how big of a problem this type of vulnerability can be. Not only can attackers read data that they shouldn&rsquo;t have access to, but they can also modify data and even run operating system commands on some systems.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Discover what SQL injections are, and how can we use them.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Use SQL injections to subvert the web application logic and bypass authentication.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Use SQL injections to read files of the back-end server.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Use SQL injections to write a web shell on the back-end server and gain remote control over it.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Learn how to mitigate such SQL injections and patch your code.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Bleeping Computer has a long list of all recent breaches and discovered vulnerabilities that involve SQL injection. A vulnerability in a WordPress plugin called LayerSlider exposed over a million sites to SQL injection (CVE-2024-2879).

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">In a campaign orchestrated by a group calling themselves ResumeLooters, the personal data of over 2 million job seekers was stolen from SQL injection and cross-site scripting (XSS) attacks on 65 different job listing and retail sites.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">The problem is still so bad that it has prompted the US agency CISA (Cybersecurity and Infrastructure Security Agency) and the FBI to issue an appeal in early 2024 for developers to review and fix SQL injection vulnerabilities in their code.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Having stressed the importance of SQL injection vulnerabilities, let us look at how these vulnerabilities can be exploited in practice.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">SQL injections happen when a developer creates queries by combining user input, and the code is not checking directly with other text to create an SQL statement.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">In the following PHP code example, the query is constructed using unsanitized inputs:

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">If the inputted username was &ldquo;alice&rdquo; then the query would be:

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">Which would always return a result. In the case where the username &lsquo;anyone&rsquo; does not exist, it would return all rows in the table.

<p style="margin-bottom: 15px; color: #333333; font-family: Inter, sans-serif; font-size: medium; background-color: #f8f8f8;">

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