CVE-2021-20683: Cross-site Scripting (XSS) in baserCMS

Background

baserCMS is an open-source content management system (CMS) developed by baserProject. It provides a platform for creating and managing websites, blogs, and online applications. The CMS offers various features such as user management, content editing, template customization, and plugin support. However, versions prior to 4.4.5 are vulnerable to a Cross-site Scripting (XSS) attack.

Vulnerability Detail

The vulnerability in baserCMS versions prior to 4.4.5 arises from improper neutralization of JavaScript input in the blog article editing function. Remote authenticated attackers can exploit this vulnerability to inject arbitrary scripts into the application via unspecified vectors. This can lead to the execution of malicious code in the context of the victim's browser, potentially compromising user data, session information, or performing unauthorized actions.

composer require baserproject/basercms:4.4.5

Workaround

As a temporary workaround, users can implement input validation and output encoding techniques to mitigate the risk of XSS attacks. This involves sanitizing user input and encoding output to prevent the execution of malicious scripts. Here is an example of input validation using PHP:

$input = $_POST['input'];

if (!empty($input)) {
    // Perform input validation
    $validatedInput = htmlspecialchars($input, ENT_QUOTES, 'UTF-8');
    // Use the validated input
    // ...
}

It is important to note that workarounds may not provide complete protection and should be considered temporary measures until the application is upgraded.

Conclusion

The Cross-site Scripting (XSS) vulnerability in baserCMS versions prior to 4.4.5 can be exploited by remote authenticated attackers to inject arbitrary scripts into the application. Upgrading to the latest version of baserCMS is the recommended solution to address this vulnerability. In the meantime, implementing input validation and output encoding techniques can serve as temporary workarounds. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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