# Exploit Title: Joomla! Component Acymailing Starter 5.9.5 CSV Macro Injection # Google Dork: N/A # Date: 22-03-2018 ################################ # Exploit Author: Sureshbabu Narvaneni ################################ # Vendor Homepage: https://www.acyba.com # Software Link: https://extensions.joomla.org/extension/acymailing-starter/ # Affected Version: 5.9.5 #Category: WebApps # Tested on: Ubuntu 14.04 x86_64/Kali Linux 4.12 i686 # CVE : CVE-2018-9107 1. Vendor Description: AcyMailing is a reliable Newsletter and email marketing extension for Joomla. It enables you to efficiently manage an unlimited number of subscribers, organize them into mailing lists, send personalized newsletters (Hi {name}...) 2. Technical Description: CSV Injection (aka Excel Macro Injection or Formula Injection) exists in the export feature in the Acyba AcyMailing extension before 5.9.6 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 Acymailing 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 5.9.6 https://extensions.joomla.org/extension/acymailing-starter/ 5. Reference: https://github.com/MrR3boot/CVE-Hunting/blob/master/AcyStarter-CSV.mp4 https://vel.joomla.org/articles/2140-introducing-csv-injection Sureshbabu Narvaneni, Security Analyst | Bug Hunter, HackerOne (mrreboot/mrr3boot) | BugCrowd (Mr_R3boot)