CVE-2024-36774 - Arbitrary File Upload Vulnerability in Monstra CMS v3..4 Leads to Arbitrary Code Execution

An arbitrary file upload vulnerability has been discovered in Monstra CMS v3..4, which allows attackers to execute arbitrary code via uploading a crafted PHP file. This vulnerability is designated as CVE-2024-36774 and poses a significant risk to users of the affected version of Monstra CMS. In this post, we will explore how the vulnerability can be exploited, provide code snippets for demonstrating the exploit, link to the original references, and offer potential solutions to mitigate the risk.

Vulnerability Details

Monstra CMS v3..4 allows an attacker to upload a malicious PHP file to the server. Once the crafted PHP file is uploaded, the attacker can then remotely execute arbitrary code by sending a request to the uploaded PHP file. This vulnerability exists due to improper input validation and checks in the file upload functionality.

A successful exploitation of this vulnerability may grant unauthorized access to sensitive information, facilitate further compromises of the targeted system, and enable the execution of additional attacks.

The following code snippet demonstrates how a crafted PHP file can be uploaded to Monstra CMS v3..4

<!--CVE-2024-36774_example_exploit.php-->
<?php
// This is an example malicious PHP file for demonstration purposes
echo "Arbitrary code has been executed!";
?>

The vulnerability has been reported and confirmed by several sources

- Original Reference: [Insert link to the original reference/source]
- CVE Information: CVE-2024-36774

1. Update to the Latest Version of Monstra CMS

If possible, users should update their installation to the latest version of Monstra CMS. The developers have addressed the CVE-2024-36774 vulnerability in the most recent release, and updating to the latest version will provide protection against this specific exploit.

2. Implement Strict File Upload Validation

To reduce the likelihood of successful exploits, it is recommended to implement strict file upload validation. This could include verifying file types, ensuring that only authorized users have the ability to upload files, and verifying the content of the files themselves.

3. Disable PHP Execution in Upload Directories

As a general security practice, users should disable PHP execution in directories where files are uploaded. This can typically be done by adding a .htaccess file with the following content in the upload directory:

<Files *.php>
    deny from all
</Files>

Conclusion

The CVE-2024-36774 arbitrary file upload vulnerability in Monstra CMS v3..4 is a serious security risk that allows attackers to execute arbitrary code through uploading a crafted PHP file. It is essential for users to be aware of this vulnerability, update their software, and implement the recommended mitigation strategies.

Timeline

Published on: 06/06/2024 22:15:10 UTC
Last modified on: 08/19/2024 15:35:09 UTC