🛡️ CVE-2024-47823 — livewire

Livewire Remote Code Execution on File Uploads

In livewire/livewire prior to v2.12.7 and v3.5.2, the file extension of an uploaded file is guessed based on the MIME type. As a result, the actual file extension from the file name is not validated. An attacker can therefore bypass the validation by uploading a file with a valid MIME type (e.g., image/png) and a “.php” file extension.

If the following criteria are met, the attacker can carry out an RCE attack:

• Filename is composed of the original file name using $file->getClientOriginalName()
• Files stored directly on your server in a public storage disk
• Webserver is configured to execute “.php” files

PoC

In the following scenario, an attacker could upload a file called shell.php with an image/png MIME type and execute it on the remote server.

```php

class SomeComponent extends Component

{

use WithFileUploads;

#[Validate('image|extensions:png')]

public $file;

public function save()

{

$this->validate();

$this->file->storeAs(

path: 'images',

name: $this->file->getClientOriginalName(),

options: ['disk' => 'public'],

);

}

}

```