Are your wireless printers accessible from the Internet?

Context, a UK based information security consultancy reveals how the firmware on Canon Pixma printers (used in the home and by SMEs) can be modified from the Internet to run custom code.  Canon Pixma wireless printers have a web interface that shows information about the printer, for example the ink levels, which allows for test pages to be printed and for the firmware to be checked for updates.

Context describes how they were able to modify the firmware, to actually running custom code which could use the wireless network stack, manipulate the memory and update the screen.

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