Functionality has been added to the John the Ripper password cracking tool that allows security testers to target password hashes in the Siemens S7 protocol.
The protocol allowed password-protected communication between SCADA, engineering stations and human machine interfaces and Programmable Logic Controllers (PLCs).
The plugin functionality builds on a tool created by Positive Technologies researcher Sergey Gordeychik that could collect credentials from PLCs by launching brute-force attacks against challenge-response data from TCP/IP traffic.
That functionality was improved with its integration with John the Ripper, one of the most popular password cracking tools.
A researcher at Digital Bond posted steps to get the plugin running.
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