记一道2021浙江省赛的Web题

合天网安实验室发布时间：2021-11-02 16:20:00 ，浏览量：0

前景

刚刚结束的浙江省网络安全大赛，其中Web类的第二题考察了POP链以及原生类的利用，在比赛期间只构造了POP链、得到flag的文件名，但是并没有利用原生类将flag文件完整读出来。这篇文章将会把这个题涉及到的知识点复现一遍，并且给出这个题详细的WP。

原生类

报错类 Error

在PHP7版本中，因为Error中带有__toString方法，该方法会将传入给__toString的参数原封不动的输出到浏览器。在这么一个过程中可能会产生XSS。

例如，有以下代码：


    
        
        
        
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[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 34 行.
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