ICS-CERT is warning utilities and other critical infrastructure providers about potential brute-force attacks against control systems with SSH command-line access. This is just the latest in a series of high-profile vulnerabilities affecting critical infrastructure of power plants, hospitals, prisons, even prisons. The attackers are probing Port 22/TCP, the default SSL listening port, to look for SSH. Last summer, researcher Dillon Beresford demonstrated a backdoor in Siemens S7-300/1200 devices that allowed him to get inside and capture passwords.”]