Replaying traffic
A replay attack is a form of cybersecurity threat where a malicious actor intercepts and records communication data, only to retransmit it later. The system or network under attack assumes the retransmitted or “replayed” data to be legitimate. In the context of an SIS, an attacker could use this method to manipulate and inject harmful data streams. Essentially, they “replay” commands in an attempt to trick the system into executing unintended actions, potentially leading to system disruptions or even safety incidents if not properly mitigated.
Replaying network traffic requires the capture of real-time data from a network protocol using tools such as Wireshark and tcpdump. Replay attacks involve the modification of the traffic to mimic a malicious client, allowing for the injection of malicious or unauthorized requests.
An extract for Triconex User Data Protocol (UDP) packet capture (1502/udp) is shown in the following screenshot...
