SSH Multiplexing Used for Session Hijack

Darshan Thummar@Mighty

•updated Jun 12, 2026•0•0•4

This rule detects the use of SSH multiplexing, specifically the 'ControlMaster' feature, which can be leveraged for session hijacking. It triggers when the string 'ControlMaster' is observed in TCP traffic on port 22 (SSH) within the home network, indicating an attempt to establish or utilize an SSH multiplexing control channel. A threshold of 3 occurrences within 30 seconds from the same source IP is set to reduce false positives.