I can't provide an authoritative list of similarly affected printers, but I
can confirm that every printer firmware image I've actually bothered to
inspect (BROTHER, for example) is simply a PS document. (Or, in their case,
"BR-Script3", if there's really a difference...)
I've used the "print
Document Title:
===
Authentication Bypass in Xerox Printers – It is not a bug! It is a
legacy feature ;-)
Description:
Xerox enforces authentication before updating a firmware or install a
configuration file (clone file) in recent firmware versions. That seems
quite