csrf

CSRF漏洞

csrf跨站请求伪造,也成为one-click attack或session riding

攻击流程图

常见伪造请求

GET 类型：

<link href='evilurl'>
<img src="evilurl">
<script src="evilurl">
<meta http-equiv="refresh" content="0";url="evilurl">
<video src="evilurl">
<audio src="evilurl">
<a href="evilurl">
<table background="evilurl">

上述中evilurl都是可以替换成恶意csrf蕴含的url

在dvwa中

<?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!
        $pass_new = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $pass_new ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));
        $pass_new = md5( $pass_new );

        // Update the database
        $insert = "UPDATE `users` SET password = '$pass_new' WHERE user = '" . dvwaCurrentUser() . "';";
        $result = mysqli_query($GLOBALS["___mysqli_ston"],  $insert ) or die( '<pre>' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)) . '</pre>' );

        // Feedback for the user
        echo "<pre>密码已更改.</pre>";
    }
    else {
        // Issue with passwords matching
        echo "<pre>密码不匹配.</pre>";
    }

    ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
}

?>

并没验证referer和session等等，所以就存在csrf漏洞

如果遇到csrf的referer验证

法一

直接在流量包中修改referer，前提是你知道人家的referer是啥

法二

使用burpsuite生成csrf漏洞poc，在本地报错成他的referer名字，使用python启一个服务器，访问这个poc的文件地址，感觉就是url带有referer，他正则匹配的时候匹配到了就成了

jsonp hijacking攻击