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Exploitation of Unitronics PLCs used in Water and Wastewater Systems

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: For Siemens TIA Portal, passwords may be stored in the PLC properties under the "Access password" area. The tag was a relic: it contained a

The tag was a relic: it contained a low-security magnetic token and a printed approval line. The plant still honored the old tokens as a physical backup. Using the token and the owl, she triggered a legacy handshake routine the HMI still accepted as valid. The system queried the tag, matched the serial, and asked for the passphrase.