This appeared on bugtraq in August of 99 

 I am aware of the Intelligent Peripherals bulletin by CIAC.

        http://www.ciac.org/ciac/bulletins/j-019.shtml

        I have a few plotters / printers under my audit umbrella and
noticed something interesting on an Oce' 9400 plotter.  The printer has
the ability to be a telnet proxy.  Where as a user can hop via telnet to
other hosts.  If the printer is not setup properly the connections will
go unlogged.

bunyip% telnet JPP1
Trying 192.168.38.244...
Connected to JPP1.
Escape character is '^]'.

Network Printer Server Version 5.6.3 (192.168.38.244)

login: root
Password:[Just enter here]

Welcome root user


WARNING: current and stored values differ.
Use 'list diff' command to find the differences.
Current values will be lost if unit is reset.

192.168.38.244:root> telnet 192.168.38.110
trying 192.168.38.110 ...
Connected to 192.168.38.110
Escape character is '0x18'

Red Hat Linux release 5.9 (Starbuck)
Kernel 2.2.3-5 on an i586
login:

192.168.38.244:root> list sysinfo
             name:
          contact:
         location:
          version: 5.6.3
    serial number: 13029
         compiled: Mar 25 1998    loginfo: sys
          logport:
           syslog: 255.255.255.255
            email: NetPrint@<unconfigured>
       dns server: 192.168.38.110
           module: novell, appletalk, netbios
         checksum: 1E54


         All that is needed is a valid DNS server setup in the plotter
configuration.

192.168.38.244:root> set sysinfo dns 192.168.38.100

And anyone can use the plotter as an anonymous telnet proxy.

Fix:

Enable passwords for the accounts on the plotter:

syntax: set user add <NAME>
         set user del <NAME>
         set user passwd <NAME> [<PASSWORD>]
         set user type <NAME> root|guest
         set user from default|stored

Enable logging:

syntax: set logpath <LOGPATH> name <NEW_NAME>
         set logpath <LOGPATH> type [[-]job] [[-]user] [[-]pgcnt]
[[-]cksum]
                     [[-]printer] [[-]ioport]
         set logpath <LOGPATH> port <TCP-PORT>|email|syslog
         set logpath from default|stored

Larry W. Cashdollar
http://vapid.dhs.org 
lwc@vapid.dhs.org