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LaserWriter Trojan Horse
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1990-10-21
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LaserWriter Trojan Horse
** THE FOLLOWING INFORMATION IS APPLE INTERNAL USE ONLY **
This article last reviewed: 15 October 1990
Problem
-------
A "Trojan horse" program has been circulating that sets the password of
PostScript LaserWriters to a value other than the default "0" -- preventing
printing with Apple's driver. It does not duplicate itself like a virus,
and is not widespread, but can be embedded in any PostScript code being
sent to a LaserWriter.
Symptoms
--------
The printer's name appears in the Chooser dialog box, but when someone
tries to print, the error message "Invalid Access" may appear. If the
Print Monitor is in use, the error message "Job cannot be printed, but the
document is OK" may appear.
Solution
--------
Apple Support is providing a utility program that resets the password of
PostScript LaserWriters to the default "0". This allows users to again
access the printer. If a customer experiences the above symptoms, use
this utility before deciding to replace the LaserWriter's controller
board.
If a customer definitely has this problem, give them a copy of the utility,
but ask that they not distribute the utility further, as it will cause
problems for some customers who restrict access to the printer by setting
the password to something other than "0".
A second utility searches a volume for all PostScript files containing
the "set password" code. Once these files are identified,the offending
files can be removed.
To locate these utilities, search the Technical Info library with the
search string "LaserWriter and Trojan horse".