How to make my login page vulnerable to SQL Injection?

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Hello im workin on a project and i need to make this php login page vulnerable sqli .. i tried as much as i can to remove functions that escape special chars But when i try to inject

' or '1' = '1' 

nothing happen ... login.php :

 include ("config.php"); 

  $username = $_POST['username']; 
  $password = $_POST['password']; 

  $sql = "SELECT id FROM users WHERE username = '$username' and password = '$password'"; 
  $result = mysqli_query($db,$sql);
 $count = mysqli_num_rows($result);

  // If result matched $username and $password, table row must be 1 row

  if($count == 1) {  
     session_register("username");
     $_SESSION['login_user'] = $username;

     header("location: welcome.php"); //set a http header
  }else {
      header("location: failed.php");
  }

If you are injecting such SQL in the password field, your query will fail.

With ' or '1' = '1'

your query will become :

SELECT id FROM users WHERE username = '$username' and password = '' or '1' = '1''
--     Syntax error a single quote is in excess --------------------------------^

You can remove the last single quote of your injection : ' or '1' = '1

Using SQL Injection to Bypass Authentication, Using SQL Injection to Bypass Authentication In this example we will demonstrate a to bypass the authentication of a vulnerable login page using SQL injection. To check for potential SQL injection vulnerabilities we have entered a single� SQL Injection Login To bypass login and gain access to restricted area, the hacker needs to build an SQL segment that will modify the WHERE clause and make it true . For example, the following login information would grant access to the attacker by exploiting the vulnerability present in the password parameter .

But when i try to inject ' or '1' = '1'

Try this

 $_POST['username'] = "' OR 1 LIMIT 1 --";

You can even use/add OFFSET to pick the user you want (by row).

SELECT id FROM users WHERE username = '' OR 1 LIMIT 1 --' and password = '$password'

Then (because of LIMIT 1)

 if($count == 1) {

Is True. The -- is the start of a inline comment in SQL, so the rest of the query is ignored. Which has obvious benefits as we can shorten or simply the query. The fewer conditions the better and we want access to the end of the query for Limit and Offset.

This also illustrates the folly of searching for the Password. If that was checked in code, this would not log you in. But because it's not, it will, timing attacks and whatnot aside.

SQL injection, Login page with user name and password verification; Both user name and The trick is not make the query valid by putting proper SQL commands on place. required since the username field is also vulnerable to SQL injection attacks. Note before reading this if you have not read the Basic SQL injection then please read that for a better understanding and be here step by step completing the injections. First let us see an example of piece of code that actually creates the Login Page vulnerable to this attack.

This may not work because, if you have many user records, the $count will be more than 1 but you are checking for only a single record to be coming out:

if ($count == 1) {

May be try changing the condition to something like:

if ($count != 0) {

Then the above condition will only filter out the non existent users and doesn't check for only one user to be returned.

Penetration Testing - Login Page SQL Injection, Penetration Testing - Login Page SQL Injection watch more videos at https://www .tutorialspoint Duration: 4:48 Posted: Jan 17, 2018 SQL Injection is an attack that poisons dynamic SQL statements to comment out certain parts of the statement or appending a condition that will always be true. It takes advantage of the design flaws in poorly designed web applications to exploit SQL statements to execute malicious SQL code.

Let's Learn SQL Injection and Bypass Login, When you enter your login credentials in a Login page like following For that, you have to use a SQL query to check whether the provided data is So, if the application is vulnerable to SQL injection, this method will land� Login page #1. Login page with user name and password verification; Both user name and password field are prone to code injection. Credentials for logging in normally

How do you perform SQL injection on a login form that checks for , Since you're confident that the SQL vulnerability exists based on your Burp results, I'm going to assume that you got that error message from� SQL Injection. SQL injection is a technique where malicious users can inject SQL commands into an SQL statement via web page input. And this input may be quite different – the text field in form, _GET or _POST parameter, cookies etc. This method was really effective before frameworks become so trendy in PHP world.

SQL Injection Testing Tutorial (Example and Prevention of SQL , In the login form, the user enters the login data, in the search field the One of the possible methods to perform it is to make the query For Example, Let's test if an appropriate login window is vulnerable for SQL Injection. Any form that takes input and uses it directly in a SQL query without checking to make sure the input is safe would be vulnerable to SQL injection. Being vulnerable to SQL injection is more or less the standard state of being unless you specifically take measures to protect against it in your code.

Comments
  • First question: Why are you even willing to do that?
  • @AaronJonk Could be for learning how SQL Injection Attacks work?
  • nothing happen sounds like a fatal error. What is the status code of the page? Have you checked your error log?
  • @AaronJonk preparing a vulnreable lab
  • But still this won't work due the to count to be one right?
  • @PraveenKumarPurushothaman indeed, but the LIMIT 1 and changing the $count == 1 were already mentionned in other answers, I didn't want to steal others solutions
  • But LIMIT 1 isn't there in the question or the OP right?
  • Well, he can change either the code, either the injection (he has to change the injection because of the syntax error that it will provide)
  • @Cid it worked without changing the code neither the injection i just forgot to remove the quote as you mentioned
  • This should have been the accepted answer, which is more complete than our answers
  • @Cid - thanks. this is probably the most common form this attack would take.
  • When you use LIMIT clause you should also add in ORDER BY id clause to get deterministic results assuming the id column exists and is a primary key which it does in 9 out of the 10 cases, otherwise you could try the deprecated ORDER BY 1 SQL standard syntax, people tend to place the primary key column first in the table.
  • I would just iterate though them, find any interesting accounts, and then change the password and email. etc... :-)
  • i know @ArtisticPhoenix i mean LIMIT without ORDER BY is non deterministic so you could be missing some interesting accounts when MySQL gives the same records because of (possible) randomness.. SQL tables and resultsets are by SQL definition orderless without using ORDER BY clause