The logic problem of PHPCMS vulnerability causes getshell

About the repair problem of getshell caused by a certain logic problem in phpcms

简介： 1. 漏洞名称：phpcms某处逻辑问题导致getshell 2. 补丁文件：/phpcms/libs/classes/attachment.class.php 3. 补丁来源：云盾自研 4. 漏洞描述：phpcms的/phpcms/libs/classes/attachment.class.php中，对输入参数$ext未进行类型限制，导致逻辑漏洞的产生。 【注意：该补丁为云盾自研代码修复方案，云盾会根据您当前代码是否符合云盾自研的修复模式进行检测，如果您自行采取了 底层/框架统一修复、或者使用了其他的修复方案，可能会导致您虽然已经修复了改漏洞，云盾依然报告存在漏洞，遇到该情况 可选择忽略该漏洞提示】 … 阿里云漏洞提示。

Solution:

1. According to the vulnerability description, find the corresponding location of the corresponding file attachment.class.php (near line 144), and add the patch code.

The patch code is as follows:

if($ext !== 'gif|jpg|jpeg|bmp|png'){ if(!in_array(strtoupper($ext),array('JPG','GIF','BMP','PNG','JPEG'))) exit('附加扩展名必须为gif、jpg、jpeg、 bmp、png'); }

The added code, the screenshot is as follows:

2. Then, copy the modified file, Upload to the corresponding file location on the server and overwrite it directly;

3. Finally, log in to the Alibaba Cloud backend and click Verify (screenshot below) to complete the vulnerability repair.

The above is all about the repair of the "logical problem somewhere in phpcms causing getshell" vulnerability.

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