Joomla! Convert Forms version 2.0.3 - Formula Injection (CSV Injection)

# Exploit Title: Joomla Extension Convert Forms version 2.0.3 is vulnerable to Formula Injection (CSV Injection)
# Google Dork: N/A
# Date: 12-04-2018
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# Exploit Author: Jetty Sairam
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# Software Link: https://extensions.joomla.org/extensions/extension/contacts-and-feedback/forms/convert-forms/
# Affected Version: 2.03 and before
#Category: Plugins and Extensions
# Tested on: WiN7_x64
# CVE : CVE-2018-10063

1. Application Description:
Convert Forms provides a framework to build custom forms for Joomla users.
2. Technical Description:
Custom Forms version 2.0.3 is affected by the vulnerability Remote Command Execution using CSV Injection. This allows a public user to inject commands as a part of form fields and when a user with higher privilege exports the form data in CSV opens the file on their machine, the command is executed.
3. Proof Of Concept:
Enter the payload @SUM(1+1)*cmd|' /C calc'!A0 in the form fields and submit.
When high privileged user logs into the application to export form data in CSV and opens the file.
Formula gets executed and calculator will get popped in his machine.
4. Solution:
Upgrade to version 2.0.4
https://extensions.joomla.org/extensions/extension/contacts-and-feedback/forms/convert-forms/
5. Reference:
https://vel.joomla.org/resolved/2160-convert-forms-2-0-3-csv-injection
https://www.tassos.gr/blog/convert-forms-2-0-4-security-release
https://vel.joomla.org/articles/2140-introducing-csv-injection