Could someone tell me if it is secure or if it is vulnerable to the SQL Injection attack or other SQL attacks ? No. As uri2x says, see SQL injection that gets around mysql_real_escape_string(). The best way to prevent SQL injection is to use prepared statements. They separate the data (your parameters) from the instructions … Read more
The idea is very simple – the query and the data are sent to the database server separately. That’s all. The root of the SQL injection problem is in the mixing of the code and the data. In fact, our SQL query is a legitimate program. And we are creating such a program dynamically, adding … Read more
The short answer is NO, PDO prepares will not defend you from all possible SQL-Injection attacks. For certain obscure edge-cases. I’m adapting this answer to talk about PDO… The long answer isn’t so easy. It’s based off an attack demonstrated here. The Attack So, let’s start off by showing the attack… $pdo->query(‘SET NAMES gbk’); $var … Read more
By using the SqlCommand and its child collection of parameters all the pain of checking for sql injection is taken away from you and will be handled by these classes. Here is an example, taken from one of the articles above: private static void UpdateDemographics(Int32 customerID, string demoXml, string connectionString) { // Update the demographics … Read more
Using parameters helps prevent SQL Injection attacks when the database is used in conjunction with a program interface such as a desktop program or web site. In your example, a user can directly run SQL code on your database by crafting statements in txtSalary. For example, if they were to write 0 OR 1=1, the … Read more
Can someone explain SQL injecton? SQL injection happens when you interpolate some content into a SQL query string, and the result modifies the syntax of your query in ways you didn’t intend. It doesn’t have to be malicious, it can be an accident. But accidental SQL injection is more likely to result in an error … Read more
It’s a common misconception that user input can be filtered. PHP even has a (now deprecated) “feature”, called magic-quotes, that builds on this idea. It’s nonsense. Forget about filtering (or cleaning, or whatever people call it). What you should do, to avoid problems, is quite simple: whenever you embed a a piece of data within … Read more
It drops the students table. The original code in the school’s program probably looks something like q = “INSERT INTO Students VALUES (‘” + FNMName.Text + “‘, ‘” + LName.Text + “‘)”; This is the naive way to add text input into a query, and is very bad, as you will see. After the values … Read more
The short answer is yes, yes there is a way to get around mysql_real_escape_string(). #For Very OBSCURE EDGE CASES!!! The long answer isn’t so easy. It’s based off an attack demonstrated here. The Attack So, let’s start off by showing the attack… mysql_query(‘SET NAMES gbk’); $var = mysql_real_escape_string(“\xbf\x27 OR 1=1 /*”); mysql_query(“SELECT * FROM test … Read more
The correct way to avoid SQL injection attacks, no matter which database you use, is to separate the data from SQL, so that data stays data and will never be interpreted as commands by the SQL parser. It is possible to create an SQL statement with correctly formatted data parts, but if you don’t fully … Read more