Joomla! Component AcySMS 3.5.0 - CSV Macro Injection

# Exploit Title: Joomla! Component AcySMS 3.5.0 CSV Macro Injection
# Google Dork: N/A
# Date: 22-03-2018
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# Exploit Author: Sureshbabu Narvaneni
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# Vendor Homepage: https://www.acyba.com
# Software Link: https://extensions.joomla.org/extensions/extension/communication/phone-a-sms/acysms/
# Affected Version: 3.5.0
# Category: WebApps
# Tested on: Ubuntu 14.04 x86_64/Kali Linux 4.12 i686
# CVE : CVE-2018-9106

1. Vendor Description:

AcySMS is a component which enables you to send follow-up campaigns,
auto-responders, newsletters, promotions, special offers, automated
messages... via SMS/Text Messages.

2. Technical Description:

CSV Injection (aka Excel Macro Injection or Formula Injection) exists in
the export feature in the Acyba AcySMS extension before 3.5.1 for Joomla!
via a value that is mishandled in a CSV export.

3. Proof Of Concept:

Login as low privileged user who is having access to AcySMS Component.
Rename user name as @SUM(1+1)*cmd|' /C calc'!A0.

When high privileged user logged in and exported user data then the CSV
Formula gets executed and calculator will get popped in his machine.

4. Solution:

Upgrade to version 3.5.1
https://extensions.joomla.org/extensions/extension/communication/phone-a-sms/acysms/


5. Reference:

https://vel.joomla.org/articles/2140-introducing-csv-injection
https://github.com/MrR3boot/CVE-Hunting/blob/master/AcySMS-CSV.mp4



Sureshbabu Narvaneni,
Security Analyst | Bug Hunter,
HackerOne (mrreboot/mrr3boot) | BugCrowd (Mr_R3boot)