q3k :blobcatcoffee: (@q3k@hackerspace.pl)
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Attached: 1 image I can finally reveal some research I've been involved with over the past year or so. We (@redford@infosec.exchange, @mrtick@infosec.exchange and I) have reverse engineered the PLC code of NEWAG Impuls EMUs. These trains were locking up for arbitrary reasons after being serviced at third-party workshops. The manufacturer argued that this was because of malpractice by these workshops, and that they should be serviced by them instead of third parties. 1/4

A polish hacker found out why trains did stop working. The manufacterer implemented a hidden electronic switch, which automatically activated after trains were serviced by a different company.

  • tal@lemmy.todayEnglish
    363·
    11 months ago

    The trains also had a GSM telemetry unit that was broadcasting lock conditions, and in some cases appeared to be able to lock the train remotely.

    So, it sounds like this remote lock is speculation, so I’m not gonna say that this is actually the case here, and I don’t know how trustworthy the source here is.

    But, speaking in general: an additional problem with sticking back doors in products is that someone else may discover them and exploit them, and the uses to which they may put them may be considerably less-pleasant than whatever the purpose that the manufacturer had in sticking them in.

    Just earlier this year, we had articles about this incident with Polish trains. That wasn’t a back door in that it wasn’t particularly hidden, but it was a way to do remote radio control of Polish trains, and sure enough, when someone who wanted to create trouble with it discovered it, it got used to cause problems for Polish train operators.

    https://www.wired.com/story/poland-train-radio-stop-attack/

    The Cheap Radio Hack That Disrupted Poland’s Railway System

    The sabotage of more than 20 trains in Poland by apparent supporters of Russia was carried out with a simple “radio-stop” command anyone could broadcast with $30 in equipment.

    • sanpo@sopuli.xyzEnglish
      39·
      11 months ago

      It wasn’t a back door, it was a safety feature working as designed. IIRC it didn’t have any modern security implemented, because it’s very old.

      Also, the link from the OP doesn’t mention that, but the trains in this story had locations of competitors’ repair centers coded in, and were apparently set to auto-lock if they detected sitting in one for more than 10 days…