连异常报错也能拿到flag？

合天网安实验室发布时间：2021-10-15 16:21:00 ，浏览量：0

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前言：

本篇将讲述PHP函数以及对象在使用过程中经常出现的错误，通过一个个小实验纠正这些错误，并且从安全的角度出发，利用这些可能存在的错误，捕获这些异常，甚至完成RCE操作。

脸滚键盘打出来的函数也能执行？

没错，该部分内容如上方小标题所示，在PHP中，即使你瞎打的函数，在经过一番调整后，可能程序就能正常运行了。

比如，有如下PHP代码：


    
        
        
        
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	请求信息 : 2025-03-14 19:08:26 HTTP/2.0 GET : /home/article/detail/id/381467.html
运行时间 : 0.0541s ( Load:0.0099s Init:0.0010s Exec:0.0321s Template:0.0111s )
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查询信息 : 16 queries 0 writes 
文件加载 : 36
缓存信息 : 5 gets 0 writes 
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	[2] session_save_path(): open_basedir restriction in effect. File(/var/lib/php/session) is not within the allowed path(s): (/www/wwwroot/www.chaojiit.com/:/tmp/) /www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php 第 1239 行.
[8192] Array and string offset access syntax with curly braces is deprecated /www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 34 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 134 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 134 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 135 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 135 行.
[8] Undefined variable: pinglun_list /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 144 行.
[8] Undefined variable: top_list /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 179 行.
    
    
        
    
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