SQL Injection, Insertion!

SQL injection is an attack where malicious code is passed to an SQL Server for execution. The attack can result in unauthorized access to confidential data, or destruction of critical data.

Before you try to read the methods below, realize that this should only be a concern for PHP developers and the like. If you are using a database driven program (e.g. WordPress, Joomla, OSCommerce), then all you need to do is upgrade your programs to the latest version available.

Methods to prevent SQL injection

Escaping

One way to prevent injections is to escape dangerous characters (i.e. backslash, apostrophe and semicolon). In PHP, it is typical to escape the input using the function mysql_real_escape_string before sending the SQL query. Example:

$Uname = mysql_real_escape_string($Uname);
$Pword = mysql_real_escape_string($Pword);
$query = "SELECT * FROM Users where UserName='$Uname' and Password='$Pword'";
mysql_query($query);

Parameterized statements

A parameterized query uses placeholders for the input, and the parameter values are supplied at execution time.

$params = array($Uname, $Pword);
$sql = 'INSERT INTO Users (UserName, Password) VALUES (?, ?)';
$query = sqlsrv_query($connection, $sql, $params);

Advanced: In PHP version 5 and above, there are multiple choices for using parameterized statements; the PDO database layer is one of them. There are also vendor-specific methods; for example, MySQL 4.1 + used with the mysqli extension.

  • SQL Injection
Hai trovato utile questa risposta? 1 Utenti hanno trovato utile questa risposta

Articoli Correlati

Internal Server Error!

The internal server error may be caused by permission error, malicious traffic that exhaust...

Brute force attempt

A brute force attack is detected when someone repeatedly attempts (and fails) to login to a...

Global WordPress Brute Force Attack

Wordpress Login - Brute Force Attack There is a worldwide, highly-distributed WordPress attack...

How can I make a stronger password?

Password Selection It is important to have a password that is easy to remember, but hard to...

How can I prevent hacking?

The most important thing to do is keep your passwords a secret. If you must give a password...