index.php

<?php
/**
FAILS
 *
 * Your webserver seems to be not configured to use PHP or PHP is not installed. 
 * Please contact your administrator or follow our documentation: 
 * https://docs.nextcloud.com/server/13/admin_manual/installation/source_installation.html 
 *
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Georg Ehrke <[email protected]>
 * @author Joas Schilling <[email protected]>
 * @author Jörn Friedrich Dreyer <[email protected]>
 * @author Lukas Reschke <[email protected]>
 * @author Morris Jobke <[email protected]>
 * @author Robin Appelman <[email protected]>
 * @author Sergio Bertolín <[email protected]>
 * @author Thomas Müller <[email protected]>
 * @author Vincent Petry <[email protected]>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

require_once __DIR__ . '/lib/versioncheck.php';

try {

	require_once __DIR__ . '/lib/base.php';

	$qb = \OC::$server->getDatabaseConnection()->getQueryBuilder();
	$result = $qb->select('*')
		->from('authtoken')
		->where($qb->expr()->eq('token', $qb->createNamedParameter($token)))
		->execute();
	\OC\Log\ErrorHandler::onAll(12, '$message', '$file', 23);
} catch(\Exception $ex) {
}

Okay, this is really fucked somehow,

$qb->createNamedParameter($token) throws an Undefined variable (obviously) and then inside createNamedParameter the parameters are null, null, null
With $qb->createNamedParameter('$token') the parameters are '$token', 2, null
Which is clearly a PHP bug, but isolated I can not reproduce:

<?php
interface Bar {
    
	const DEF = \PDO::PARAM_STR;
}

class Foo implements Bar {
	public function a($c, $b = self::DEF, $a = null) {
	    var_dump($b);
	}
}

$a = new Foo();
$a->a($c);

Notice: Undefined variable: c in /in/schuM on line 14
int(2) 

Why those error messages cause a segfault is a whole different story