Overview

In this long read, we will discuss the CVE-2024-25925 vulnerability, which involves the unrestricted upload of files with dangerous types in the WooCommerce Easy Checkout Field Editor, Fees & Discounts created by SYSBASICS. We will discuss the vulnerable versions, potential risks, and provide details about an exploit, as well as code snippets and links to original references.

Affected versions

CVE-2024-25925 affects the WooCommerce Easy Checkout Field Editor, Fees & Discounts plugin, from its earliest version until version 3.5.12.

Exploit details

The unrestricted upload vulnerability enables an attacker to upload malicious files or scripts to the affected server, which can lead to further system or network compromise. In the case of CVE-2024-25925, an authenticated attacker (minimum required capability: "shop_manager") can exploit this vulnerability by uploading files with dangerous types using the "Import Checkout Fields" functionality provided by the plugin.

Here's a code snippet that demonstrates the potential exploit

// Sample POST request payload
{
    "action": "wshop_ajax_import_product_checkout_fields",
    "file": {"file": "/path/to/malicious/file.ext"}
}

This payload simulates the attacker's POST request, in which they use the "wshop_ajax_import_product_checkout_fields" action with a reference to a malicious file.

The vulnerable code can be found in the following function

// Vulnerable function in file "woocommerce-checkout-fields-import-export/eo_wf_checkout.php"

function wshop_ajax_import_product_checkout_fields {     
    if(isset($_FILES['file']['name'])) {
        $uploaded_file = $_FILES['file'];
        /* Code continues, without proper file type validation */
    }
}

This function does not include proper file type validation before accepting the uploaded file, which allows the attacker to upload files with dangerous types.

Mitigation

To defend against this vulnerability, it is crucial to update the WooCommerce Easy Checkout Field Editor, Fees & Discounts plugin to the latest version. In this case, users must update to version 3.5.13 or higher.

Moreover, it is recommended to implement proper file type validation within the application code. For example, only allow specific file extensions or MIME types that are necessary for the expected functionality.

// Example of improved validation

function wshop_ajax_import_product_checkout_fields {
    $allowed_mime_types = array('application/json', 'text/csv');
    if(isset($_FILES['file']['name']) && in_array($_FILES['file']['type'], $allowed_mime_types)) {
        $uploaded_file = $_FILES['file'];
    } else {
        /* Handle rejected file uploads */
    }
}

1. Original CVE-2024-25925 advisory on NVD
2. SYSBASICS WooCommerce Easy Checkout Field Editor, Fees & Discounts, Plugin page
3. File type validation best practices

Conclusion

CVE-2024-25925 is a serious security vulnerability that could allow an attacker to upload dangerous files to an affected web server. It is essential for site administrators to update their WooCommerce Easy Checkout Field Editor, Fees & Discounts plugin to the latest version and implement proper file type validation within the application to mitigate this risk.

Timeline

Published on: 02/26/2024 16:27:59 UTC
Last modified on: 02/26/2024 16:32:25 UTC