strpos使用不当引发漏洞

慕晨sekurlsa 发布时间：2022-08-08 22:44:12 ，浏览量：2

strpos使用不当引发漏洞一、strpos函数介绍

在这里插入图片描述

二、漏洞点

从上面的函数介绍中可以看到，strpos函数如果匹配到第二个参数指定的字符串，那么就会返回它的下标。

那么如果被匹配字符串的开头就是我们要匹配的目标字符串，那么strpos函数就会返回0。如果搜索不到，那么就返回false。

问题就出现在这个0和false上，有些开发者会忽略了strpos函数返回0的情况，采用了strpos函数返回值与false进行弱比较的方式，那么就可以造成strpos函数的恶意利用。

例：


    
        
        
        
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