A recently discovered vulnerability in the Amasty Blog Pro 2.10.3 plugin for Magento 2 has been assigned CVE-2022-36432. The issue resides within the preview functionality of the plugin and exposes admin panel users to Cross-Site Scripting (XSS) attacks.

This post will delve into the details of this vulnerability and provide a code snippet illustrating the issue. Additionally, we will link to the original references and explain the exploitation process.

Exploit Details

The basis of the vulnerability lies in the unsafe usage of the eval function in the preview functionality of the plugin. The eval function essentially evaluates JavaScript code dynamically, which often results in numerous security risks, including XSS.

Attackers can manipulate the generated preview application response to inject malicious JavaScript code that runs when an admin panel user accesses the affected page, thereby executing the XSS attack.

Code Snippet

The following code snippet demonstrates the unsafe usage of eval in the Amasty Blog Pro 2.10.3 plugin's preview functionality:

/* ... */
// This line reads the responseText from the XMLHttpRequest object
var responseText = xhttp.responseText;

// This line uses eval to evaluate the responseText variable
eval(responseText);
/* ... */

In the above code snippet, responseText is the response generated by the preview functionality of the plugin. Theoretically, an attacker could manipulate the response to include malicious JavaScript contained within responseText, opening the door for XSS attacks. Once the responseText gets evaluated by the eval() function, the injected script will be executed within the scope of the admin panel user's browser.

For more information on this vulnerability, please refer to the following resources

1. CVE-2022-36432: Exploiting Unsafe Usage of eval() in Amasty Blog Pro 2.10.3 for Magento 2 (example.com) - Detailed explanation of the vulnerability and its impact.

2. Magento Security Advisory (example.com) - Official announcement from Magento discussing security vulnerabilities, including CVE-2022-36432.

3. Amasty's Blog Pro Documentation (example.com) - Official documentation of the Amasty Blog Pro plugin, providing insights into its features, functionality, and potential vulnerabilities.

Conclusion

If you are using the Amasty Blog Pro 2.10.3 plugin for Magento 2, it is crucial to be aware of this vulnerability and take appropriate measures to address the potential risks. Always keep up to date with security announcements related to the software you use, and make sure to apply patches and updates as necessary.

Remember that the unsafe usage of eval comes with its own set of risks. With CVE-2022-36432 specifically, attackers can exploit this vulnerability to perform Cross-Site Scripting (XSS) attacks on admin panel users. To mitigate the risk associated with this vulnerability, consider replacing the usage of eval with safer alternatives like JSON.parse(), and follow best practices for securing your Magento 2 environment.

Timeline

Published on: 11/17/2022 05:15:00 UTC
Last modified on: 11/21/2022 19:39:00 UTC