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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：2

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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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	    基本
        文件
        流程
        错误
        SQL
        调试
    

		    
    
	请求信息 : 2025-08-19 15:31:12 HTTP/2.0 GET : /home/article/detail/id/381467.html
运行时间 : 0.1755s ( Load:0.0688s Init:0.0680s Exec:0.0257s Template:0.0130s )
吞吐率 : 5.70req/s
内存开销 : 1,919.97 kb
查询信息 : 16 queries 0 writes 
文件加载 : 36
缓存信息 : 5 gets 0 writes 
配置加载 : 132
会话信息 : SESSION_ID=2jmom7c4mdrn3bqinove32qa9p
    
    
        
    
	/www/wwwroot/www.chaojiit.com/index.php ( 1.30 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/ThinkPHP.php ( 4.71 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Think.class.php ( 12.32 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Storage.class.php ( 1.38 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.56 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Mode/common.php ( 2.82 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Common/functions.php ( 51.07 KB )
/www/wwwroot/www.chaojiit.com/Application/Common/Common/function.php ( 6.83 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Hook.class.php ( 4.02 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/App.class.php ( 12.44 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Dispatcher.class.php ( 15.15 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Route.class.php ( 13.38 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Controller.class.php ( 10.95 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/View.class.php ( 7.96 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.69 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.89 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.93 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Conf/convention.php ( 11.18 KB )
/www/wwwroot/www.chaojiit.com/Application/Common/Conf/config.php ( 1.81 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Lang/zh-cn.php ( 2.57 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Conf/debug.php ( 1.51 KB )
/www/wwwroot/www.chaojiit.com/Application/Home/Conf/config.php ( 0.05 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
/www/wwwroot/www.chaojiit.com/Application/Home/Controller/ArticleController.class.php ( 6.71 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Model.class.php ( 67.27 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Db.class.php ( 5.70 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Db/Driver/Mysql.class.php ( 8.73 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Db/Driver.class.php ( 41.60 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache.class.php ( 3.84 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.90 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Template.class.php ( 28.35 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.62 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.19 KB )
/www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php ( 14.55 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 1.43 KB )
/www/wwwroot/www.chaojiit.com/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.27 KB )
    
    
        
    
	[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000044s ]
[ app_init ] --END-- [ RunTime:0.000131s ]
[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000822s ]
[ app_begin ] --END-- [ RunTime:0.000996s ]
[ view_parse ] --START--
[ template_filter ] --START--
Run Behavior\ContentReplaceBehavior [ RunTime:0.000249s ]
[ template_filter ] --END-- [ RunTime:0.000306s ]
Run Behavior\ParseTemplateBehavior [ RunTime:0.009338s ]
[ view_parse ] --END-- [ RunTime:0.009398s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000926s ]
[ view_filter ] --END-- [ RunTime:0.001017s ]
[ app_end ] --START--
    
    
        
    
	[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 37 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 97 行.
[8] Undefined variable: user /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Trying to access array offset on value of type null /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 98 行.
[8] Undefined variable: pinglun_list /www/wwwroot/www.chaojiit.com/Application/Runtime/Cache/Home/3c8a1a47a3534a7b1252c226abfc3928.php 第 107 行.
    
    
        
    
	SHOW COLUMNS FROM `configuration` [ RunTime:0.0007s ]
SELECT `value` FROM `configuration` WHERE `name` = 'site_name' LIMIT 1   [ RunTime:0.0001s ]
SHOW COLUMNS FROM `menu` [ RunTime:0.0008s ]
SELECT * FROM `menu` WHERE `fid` = 0 AND `status` = 1  [ RunTime:0.0001s ]
SELECT * FROM `menu` WHERE `fid` = 1 AND `status` = 1  [ RunTime:0.0001s ]
SELECT * FROM `menu` WHERE `fid` = 2 AND `status` = 1  [ RunTime:0.0001s ]
SELECT * FROM `menu` WHERE `fid` = 3 AND `status` = 1  [ RunTime:0.0001s ]
SELECT * FROM `menu` WHERE `fid` = 4 AND `status` = 1  [ RunTime:0.0001s ]
SHOW COLUMNS FROM `article` [ RunTime:0.0005s ]
SELECT * FROM `article` WHERE `id` = 381467 LIMIT 1   [ RunTime:0.0003s ]
SHOW COLUMNS FROM `bloger` [ RunTime:0.0005s ]
SELECT * FROM `bloger` WHERE `id` = 570 LIMIT 1   [ RunTime:0.0003s ]
SELECT COUNT(*) AS tp_count FROM `article` WHERE `bloger_id` = 570 LIMIT 1   [ RunTime:0.0005s ]
SHOW COLUMNS FROM `article_content` [ RunTime:0.0004s ]
SELECT `content` FROM `article_content` WHERE `article_id` = 381467 LIMIT 1   [ RunTime:0.0004s ]
SELECT * FROM `article` WHERE `bloger_id` = 570 ORDER BY view_count desc LIMIT 0,10   [ RunTime:0.0042s ]
    
    
        
    
	    
    
    



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