A new vulnerability, CVE-2022-41355, has been discovered in the Online Leave Management System v1.. The system is exposed to a SQL injection vulnerability through the id parameter at /leave_system/classes/Master.php?f=delete_department. In this post, we will delve into the details of the exploit, examine the code snippet, and provide links to original references.
Exploit Details
The vulnerability stems from an improper input validation in the "id" parameter at /leave_system/classes/Master.php?f=delete_department. This allows an attacker to easily inject malicious SQL queries into the website, ultimately extracting or manipulating the data stored within the application's database. The absence of proper validation makes it possible for an attacker to perform unauthorized database actions, including the ability to read sensitive data, modify, or even delete important information.
The following is an example of a vulnerable query that could be exploited by an attacker
<?php
//... (other code)
$id = $_GET['id']; // Get the 'id' parameter from the user through a GET request
$query = "DELETE FROM departments WHERE id = $id"; // The SQL query to delete the department with the specified id
$result = mysqli_query($conn, $query); // Execute the query on the given connection
//... (other code)
?>
The code above retrieves the "id" parameter directly from user input ($_GET['id']) without proper validation or sanitization, then constructs a DELETE query using the raw input. This action opens the application up to potential SQL injection attacks.
To mitigate this vulnerability, proper input validation and sanitization should be implemented using prepared statements or parameterized queries. Here's an example of how to fix the above code snippet using prepared statements in PHP:
<?php
//... (other code)
$id = $_GET['id']; // Get the 'id' parameter from the user through a GET request
$query = "DELETE FROM departments WHERE id = ?"; // The SQL query with placeholder
$stmt = mysqli_prepare($conn, $query); // Prepare the query
mysqli_stmt_bind_param($stmt, "i", $id); // Bind the parameter 'id' as an integer
mysqli_stmt_execute($stmt); // Execute the prepared statement
//... (other code)
?>
Original References
For more information on this vulnerability and its impact, you can consult the following original references:
1. CVE-2022-41355: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-41355
2. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-41355
3. Exploit Database: https://www.exploit-db.com/exploits/51943
Conclusion
CVE-2022-41355 is a critical SQL injection vulnerability discovered in the Online Leave Management System v1., which poses a significant threat to the confidentiality, integrity, and availability of the application's data. Protecting against this vulnerability requires the implementation of proper security practices, including input validation and parameterized queries. As always, it is crucial for developers to stay up-to-date on the latest security threats and best practices to keep their applications safe from potential exploits.
Timeline
Published on: 10/06/2022 20:15:00 UTC
Last modified on: 10/07/2022 19:23:00 UTC