Pimcore: Missing Authorization in WebDAV MOVE via unchecked asset move handling

Summary

Pimcore's WebDAV asset endpoint exposes a MOVE operation through /asset/webdav{path} without adding an authentication plugin in the WebDAV controller. The Tree::move() implementation then performs asset mutation and deletion before checking a current Pimcore user or any asset permissions.

An unauthenticated remote attacker who knows two existing asset paths in the same directory can send a WebDAV MOVE request that deletes the source asset. Authenticated low-privileged users may also be able to perform unauthorized asset move or overwrite operations because the move path does not enforce rename, delete, create, or publish permissions.

Details

The route for WebDAV is globally registered and accepts arbitrary trailing paths:

# bundles/CoreBundle/config/routing.yaml
pimcore_webdav:
    path: /asset/webdav{path}
    defaults: { _controller: Pimcore\Bundle\CoreBundle\Controller\WebDavController::webdavAction }
    requirements:
        path: '.*'

The controller constructs a SabreDAV server but only attaches lock and browser plugins. It does not attach an authentication plugin or perform an explicit user/session check before starting the server:

# bundles/CoreBundle/src/Controller/WebDavController.php
$publicDir = new Asset\WebDAV\Folder($homeDir);
$objectTree = new Asset\WebDAV\Tree($publicDir);
$server = new \Sabre\DAV\Server($objectTree);
$server->setBaseUri($this->generateUrl('pimcore_webdav', ['path' => '/']));
$server->addPlugin($lockPlugin);
$server->addPlugin(new \Sabre\DAV\Browser\Plugin());
$server->start();

Most WebDAV file and folder operations perform permission checks through isAllowed(), but Tree::move() does not. In the overwrite path for a same-directory move, it deletes the source asset before resolving the current user:

# models/Asset/WebDAV/Tree.php
if (dirname($sourcePath) == dirname($destinationPath)) {
    if ($asset = Asset::getByPath('/' . $destinationPath)) {
        $sourceAsset = Asset::getByPath('/' . $sourcePath);
        $asset->setData($sourceAsset->getData());
        $sourceAsset->delete();
    }
    ...
}

$user = \Pimcore\Tool\Admin::getCurrentUser();
$asset->setUserModification($user->getId());
$asset->save();

Asset::delete() removes the asset without an internal permission gate:

# models/Asset.php
public function delete(bool $isNested = false): void
{
    ...
    $this->getDao()->delete();
    ...
    $this->deletePhysicalFile();
}