Joomla Convert Forms version 2.0.3 CVE-2018-10063 Formula Injection

Authors:Sairam Jetty            Risk:High
 
CVE:CVE-2018-10063             0day:Formula Injection  

0day-id:0DAY-10063              Date:2018-04-14

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.

Application Description

Convert Forms provides a framework to build custom forms for Joomla users.

Proof Of Concept

# Exploit Title: Joomla Extension Convert Forms version 2.0.3 -  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

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.

Solution

Upgrade to version 2.0.4

https://extensions.joomla.org/extensions/extension/contacts-and-feedback/forms/convert-forms/

Reference

https://www.tassos.gr/blog/convert-forms-2-0-4-security-release

https://vel.joomla.org/articles/2140-introducing-csv-injection

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