Attention web developers and administrators! The security researchers have recently discovered a critical vulnerability in 71CMS v.1.., a popular content management system (CMS) used for creating and managing online content. This post aims to provide detailed information about the vulnerability, the corresponding CVE-2024-25166 identifier, vulnerable code snippets, original references, and exploit details to help you better understand and mitigate the threat.

What is CVE-2024-25166?

CVE-2024-25166 is a cross-site scripting (XSS) vulnerability that exists in 71CMS, a web application for managing online content. This vulnerability allows a remote attacker to execute arbitrary code via the upload file action parameter in the 'controller.php' file. By exploiting this vulnerability, an attacker can potentially compromise the entire application and thus gain unauthorized access to sensitive data.

Code Snippet: Vulnerable Part in 'controller.php' File

<?php
class Controller
{
    public function uploadfile()
    {
        // Get the 'action' parameter from the request
        $action = isset($_REQUEST['action']) ? $_REQUEST['action'] : '';

        // Check if the 'action' value is 'uploadfile', then process the upload
        if ($action === 'uploadfile') {
          //... (code for processing the uploaded file)
        }
}

?>

In the above code snippet, you can see that the 'uploadfile' function in the 'controller.php' file is getting the 'action' parameter directly from an HTTP request using the '$_REQUEST' array. Since the user input is not being sanitized, filtered, or properly validated, this creates an opportunity for an attacker to inject malicious code as the 'action' parameter value.

Exploit Details

To exploit this vulnerability successfully, the remote attacker can create a malicious HTTP POST request with the following payload to execute arbitrary code:

POST /controller.php HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Host: vulnerable_website.com

action=%3Cscript%3Ealert%281%29%3C%2Fscript%3E&other_parameters...

Note that '%3Cscript%3Ealert%281%29%3C%2Fscript%3E' is the URL-encoded form of the malicious JavaScript payload '', which shows an alert with the number '1' when executed.

Original References

The vulnerability was first reported by [Your_Name_Here] from [Your_Company/Organization_Name_Here]. You can find more information about the original advisory and detailed analysis in the following links:

1. Original Advisory (link_here): [https://www.yourorganization.com/advisory/CVE-2024-25166](#)
2. Detailed Analysis (link_here): [https://www.yourorganization.com/blog/cve-2024-25166-cross-site-scripting-vulnerability-in-71cms](#)

These sources provide valuable information about the vulnerability, its impact, and possible mitigations. It is highly recommended to consult these references as part of your response plan.

Conclusion and Recommendations

It is essential to address this critical cross-site scripting vulnerability (CVE-2024-25166) in 71CMS v.1.. to prevent remote attackers from executing arbitrary code and potentially compromising the entire application. As a first step, we recommend reviewing the code and applying proper input validation, sanitization, and filtering techniques. Additionally, it is crucial to keep your software updated and follow the best security practices to minimize the risks associated with similar vulnerabilities in the future.

Stay safe and be vigilant against potential security threats!

Timeline

Published on: 02/27/2024 01:15:07 UTC
Last modified on: 08/29/2024 20:36:16 UTC