CVE-2024-47823: Livewire Remote Code Execution (RCE) 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'], ); } }