Quote from Wikileaks document https://wikileaks.org/ciav7p1/cms/page_20250630.html:
“ROS 6.28 has a Firewall Filter Rule to drop access to WAN side ethernet port. This was disabled in order to throw ChimayRed”
Also, it seems that this exploit may not be functional in RouterOS version above v6.30.1 (released 2015-07-15).
Quote from Wikileaks document https://wikileaks.org/ciav7p1/cms/page_20251203.html:
“Downgraded to ROS 6.30.1. ChimayRed does not support 6.30.2”