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Hacking Printers Advisory ⅙:PostScript printers vulnerable to print job capture

• nine_k 10y ago
  «By redefining the `showpage' operator which is contained in every PostScript document to print the current page, an attacker can hook in there and execute her our own PostScript code. Long term redefinition (until the device is restarted) is possible by prepending the `startjob'/`exitserver' operators.» Then all bets are off, any print job can be captured, altered, stored, denied, etc.