Dvwa--Brute Force

Low

我们先用burp抓包

发送给intruder，先clear清楚掉所选变量，在add标记username 和password

爆破模式选择集束炸弹，字典就选默认的usernames 和passwords，通过字典破解就可以成功爆破了。

Middle

看看middle的源码，里面多了mysqli_real_escape_string函数对sql中的特殊字符作转义： NUL（ASCII 0）、\n、\r、\、'、" 和 Control-Z。并不影响爆破，只是不能sql注入。

还增加了登录失败seelp 2s，只是会爆破的慢一些，原理方法一样。

High

增加了token验证

<?php

if( isset( $_GET[ 'Login' ] ) ) {
    // Sanitise username input
    $user = $_GET[ 'username' ];
    $user = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $user ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));

    // Sanitise password input
    $pass = $_GET[ 'password' ];
    $pass = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $pass ) : ((trigger_error("[MySQLConverterToo] Fix the c() call! This code does not work.", E_USER_ERROR)) ? "" : ""));
    $pass = md5( $pass );

    // Check the database
    $query  = "SELECT * FROM `users` WHERE user = '$user' AND password = '$pass';";
    $result = mysqli_query($GLOBALS["___mysqli_ston"],  $query ) or die( '<pre>' . ((is_object($GLOBALS["___mysqli_ston"])) ? mysqli_error($GLOBALS["___mysqli_ston"]) : (($___mysqli_res = mysqli_connect_error()) ? $___mysqli_res : false)) . '</pre>' );

    if( $result && mysqli_num_rows( $result ) == 1 ) {
        // Get users details
        $row    = mysqli_fetch_assoc( $result );
        $avatar = $row["avatar"];

        // Login successful
        $html .= "<p>Welcome to the password protected area {$user}</p>";
        $html .= "<img src=\"{$avatar}\" />";
    }
    else {
        // Login failed
        sleep( 2 );
        $html .= "<pre><br />Username and/or password incorrect.</pre>";
    }

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

?>