CVE-2018-25335 - WordPress Peugeot Music Plugin Arbitrary File Upload Vulnerability

CVE-2018-25335 is an arbitrary file upload vulnerability affecting version 1.0 of the Peugeot Music plugin for WordPress. This vulnerability allows unauthenticated attackers to upload malicious files, such as PHP scripts, by sending crafted POST requests to the upload.php endpoint. The vulnerability stems from the lack of proper input validation and authentication checks on file uploads. By manipulating the ’name’ parameter, an attacker can bypass extension restrictions and upload files with arbitrary extensions directly into the uploads directory, leading to potential remote code execution on the vulnerable WordPress site. This poses a significant risk, as successful exploitation could allow attackers to gain complete control over the affected website.

Attack Chain

1. An unauthenticated attacker identifies a WordPress site using the Peugeot Music plugin version 1.0.
2. The attacker crafts a malicious PHP file designed for remote code execution.
3. The attacker sends a POST request to the /wp-content/plugins/peugeot-music/upload.php endpoint.
4. The POST request includes the malicious PHP file in the request body. The ’name’ parameter is manipulated to bypass extension restrictions (e.g., renaming a file from shell.php.jpg to shell.php).
5. The vulnerable upload.php script fails to properly validate the file type or authenticate the user, and saves the malicious file to the uploads directory.
6. The attacker determines the location of the uploaded file within the uploads directory.
7. The attacker sends an HTTP request to the uploaded PHP file (e.g., /wp-content/uploads/shell.php).
8. The server executes the PHP code, granting the attacker remote code execution capabilities on the server.

Impact

Successful exploitation of CVE-2018-25335 allows an unauthenticated attacker to upload arbitrary files and achieve remote code execution on the target WordPress server. This can lead to complete compromise of the website, allowing the attacker to deface the site, steal sensitive data, install backdoors, or use the compromised server as a launchpad for further attacks. Given the widespread use of WordPress and its plugins, this vulnerability could impact a significant number of websites if left unpatched.

Recommendation

• Apply available updates or patches for the Peugeot Music plugin to address CVE-2018-25335.
• Implement the Sigma rule “Detect CVE-2018-25335 Exploitation Attempt — WordPress Peugeot Music Plugin Arbitrary File Upload” to detect potential exploitation attempts.
• Monitor web server logs for POST requests to /wp-content/plugins/peugeot-music/upload.php with unusual file extensions or content, as this could indicate exploitation attempts (webserver logs).
• Implement strong file upload validation on all WordPress plugins to prevent arbitrary file uploads and mitigate similar vulnerabilities.