• Kerb
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      3 months ago

      its an sql injection attack.
      its rather unlikely that it works in a modern app.

      assuming this would work,
      it injects a command in the sql database.

      it is assumed that the app runs a sql querry with the input field as a parameter e.g.
      INSERT INTO "bills" (item, ammount, tip) VALUES ("steak", "20,00 $", "content of the custom tip goes here");

      the semicolon indicates the end of the querry,
      so the the text would cause the app to run an unfinished querry, and then start a new querry that messes up the content of the bills table.

    • @diffcalculus@lemmy.world
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      283 months ago

      Nothing. For one, it won’t let you enter letters. Two, the table structure to these POS systems are more nuanced than a simple bills table with am amounts field.

      It’s amusing and all, but it’s not something you can do.

      Source: work with, and develop around, these types of POS systems.