What does world x do in SQL

SQL Injection: Basics and Protective Measures

You can take various measures to prevent SQL injection attacks on your database system. You should deal with all the components involved - the server, the individual applications and the database management system.

Step 1: Monitor the automatic entries of the applications

Check and filter the methods and parameters that integrated applications use when entering data into the database. The transferred data should always be of the expected data type. Is a numeric one parameter asked, you can include it with the help of a PHP script, for example is_numeric ()-Check function. When filtering, you have to ignore the corresponding special characters. Another important point is to make sure that the applications if possible, no external error messages that reveal information about the system used or the structure of the database.

The so-called prepared statements, which you can use with many database management systems, are now common practice. These predefined statements were originally used to execute more frequent queries, but their structure also reduces the risk of SQL injection. This is because the parameterized statements transmit the actual SQL command separately from the parameters to the database. Only the database management system itself then brings the two together and automatically masks the crucial special characters.

Step 2: Provide comprehensive server protection

The security of the server on which you run your database management system naturally also plays a major role in SQL injection prevention. The first priority here is the hardening of the operating system according to the familiar pattern:

  • Install or activate only those applications and services that are relevant for operating the database.
  • Delete any user accounts that you do not need.
  • Make sure that all relevant system and program updates are installed.

The higher the requirements that are linked to the security of your web project, the sooner you should consider the use of intrusion detection systems (IDS) or intrusion prevention systems (IPS). These work with different detection systems, to detect attacks on the server at an early stageTo issue warnings and, in the case of IPS, automatically initiate appropriate countermeasures. A Application Layer Gateway point out that monitors the data traffic between applications and web browser directly at the application level.

Step 3: harden database and use secure codes

Like your operating system, the database should be freed of all irrelevant factors and updated regularly. To do this, remove all stored procedures that you do not need and disable all unnecessary services and user accounts. Set up one special database account one that is only intended for access from the web and requires minimal access rights. Also save all sensitive data such as passwords in encrypted form in your database.

In terms of the Prepared Statements, it is strongly recommended not to use the PHP module mysql and to choose mysqli or PDO instead. In this way, you can also protect yourself with secure codes. For example, the function mysqli_real_escape_string () in PHP scripts prevents special characters from being transferred to the SQL database in their original form and masks them. For example, if you have the following lines of code