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For example, if you're using MySQLi in PHP this should become: $stmt = $pdo->prepare('SELECT * FROM table WHERE column = :value') You could fix this query by explicitly parameterising it. Since '1' is equal to '1' this will allow the attacker to add an additional query to the end of the SQL statement which will also be executed.
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If an attacker changed the URL parameter to pass in ' or '1'='1 this will cause the query to look like this: "SELECT * FROM table WHERE column = '' OR '1'='1' " You can easily prevent this by always using parameterised queries, most web languages have this feature and it is easy to implement.Ĭonsider this query: "SELECT * FROM table WHERE column = '" + parameter + "' " When you use standard Transact SQL it is easy to unknowingly insert rogue code into your query that could be used to change tables, get information and delete data. SQL injection attacks are when an attacker uses a web form field or URL parameter to gain access to or manipulate your database. Ensure you keep your dependencies up to date, and use tools like Gemnasium to get automatic notifications when a vulnerability is announced in one of your components.
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Many developers use tools like Composer, npm, or RubyGems to manage their software dependencies, and security vulnerabilities appearing in a package you depend on but aren't paying any attention to is one of the easiest ways to get caught out.