Xerox WORKCENTRE 5735 Technical manual

Xerox WorkCentre
5735/5740/5745/5755/5765/5775/5790
Information Assurance Disclosure Pa er
Version 2.0
Pre ared by:
Larry Kovnat
Xerox Cor oration
1350 Jefferson Road
Rochester, New York 14623

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©2010 Xerox Cor oration. All rights reserved. Xerox and the s here of connectivity design are trademarks of
Xerox Cor oration in the United States and/or other counties.
Other com any trademarks are also acknowledged.
Document Version: 1.00 (May 2010).

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1. INTRODUCTION ..................................................................................................................................5
1.1. Purpose .................................................................................................................................................................................... 5
1.2. Target Audience ................................................................................................................................................................... 5
1.3. Disc aimer ............................................................................................................................................................................... 5
2. DEVICE DESCRIPTION .......................................................................................................................6
2.1. Security-re evant Subsystems ......................................................................................................................................... 6
2.1.1. Physical Partitioning .......................................................................................................................................................................6
2.1.2. Security Functions allocated to Subsystems ........................................................................................................................7
2.2. Contro er ................................................................................................................................................................................ 8
2.2.1. Pur ose ................................................................................................................................................................................................8
2.2.2. Memory Com onents ....................................................................................................................................................................8
2.2.3. External Connections .................................................................................................................................................................. 10
2.2.4. USB Ports ......................................................................................................................................................................................... 10
2.2. Fax Modu e .......................................................................................................................................................................... 11
2.3.1. Pur ose ............................................................................................................................................................................................. 11
2.3.2. Hardware ......................................................................................................................................................................................... 11
2.4. Scanner ................................................................................................................................................................................. 11
2.4.1. Pur ose ............................................................................................................................................................................................. 11
2.4.2. Hardware ......................................................................................................................................................................................... 11
2.5. Graphica User Interface (GUI) ................................................................................................................................... 12
2.5.1. Pur ose ............................................................................................................................................................................................. 12
2.5.2. Hardware ......................................................................................................................................................................................... 12
2.6. Marking Engine (a so known as the Image Output Termina or IOT) .......................................................... 13
2.6.1. Pur ose ............................................................................................................................................................................................. 13
2.6.2. Hardware ......................................................................................................................................................................................... 13
2.6.3. Control and Data Interfaces .................................................................................................................................................... 13
2.7. System Software Structure ........................................................................................................................................... 13
2.7.1. O en-source com onents ......................................................................................................................................................... 13
2.7.2. OS Layer in the Controller ......................................................................................................................................................... 13
2.7.3. Network Protocols ........................................................................................................................................................................ 15
2.8. Logica Access ..................................................................................................................................................................... 16
2.8.1. Network Protocols ........................................................................................................................................................................ 16
2.8.2. Ports ................................................................................................................................................................................................... 17
2.8.3. IP Filtering ....................................................................................................................................................................................... 21
3. SYSTEM ACCESS ................................................................................................................................ 22
3.1. Authentication Mode ..................................................................................................................................................... 22

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3.2. Login and Authentication Methods ........................................................................................................................... 24
3.2.1. System Administrator Login [All roduct configurations] ........................................................................................... 24
3.2.2. User authentication ..................................................................................................................................................................... 24
3.3. System Accounts ............................................................................................................................................................... 26
3.3.1. Printing [Multifunction models only] .................................................................................................................................... 26
3.3.2. Network Scanning [Multifunction models only] .............................................................................................................. 26
3.4. Diagnostics .......................................................................................................................................................................... 27
3.4.1. Service [All roduct configurations] ...................................................................................................................................... 27
3.4.2. Alternate Boot via Serial Port .................................................................................................................................................. 27
3.4.3. tty Mode ........................................................................................................................................................................................... 27
3.4.4. Diagnostics via Portable Service Workstation (PSW) Port ........................................................................................... 27
3.4.5. Summary .......................................................................................................................................................................................... 30
4. SECURITY ASPECTS OF SELECTED FEATURES ...................................................................... 31
4.1. Audit Log .............................................................................................................................................................................. 31
4.2. Xerox Standard Accounting .......................................................................................................................................... 39
4.3. Automatic Meter Reads ................................................................................................................................................. 40
4.4. Encrypted Partitions ........................................................................................................................................................ 40
4.5. Image Overwrite ............................................................................................................................................................... 40
4.5.1. Algorithm ......................................................................................................................................................................................... 41
4.5.2. User Behavior ................................................................................................................................................................................. 41
4.5.3. Overwrite Timing .......................................................................................................................................................................... 41
5. RESPONSES TO KNOWN VULNERABILITIES ......................................................................... 42
5.1. Security @ Xerox (www.xerox.com/security) .......................................................................................................... 42
6. APPENDICES ....................................................................................................................................... 43
6.1. Appendix A – Abbreviations ......................................................................................................................................... 43
6.2. Appendix B – Supported MIB Objects ....................................................................................................................... 45
6.3. Appendix C –Standards .................................................................................................................................................. 48
6.4. Appendix E – References ................................................................................................................................................ 50

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1. Introduction
The WorkCentre 5735/5740/5745/5755/5765/5775/5790 multifunction systems are among the latest
versions of Xerox co ier and multifunction devices for the general office.
1.1. Pur ose
The ur ose of this document is to disclose information for the WorkCentre roducts with res ect to device security.
Device Security, for this a er, is defined as how image data is stored and transmitted, how the roduct behaves in a
networked environment, and how the roduct may be accessed, both locally and remotely. Please note that the
customer is res onsible for the security of their network and the WorkCentre roducts do not establish security for
any network environment.
The ur ose of this document is to inform Xerox customers of the design, functions, and features of the WorkCentre
roducts relative to Information Assurance (IA).
This document does NOT rovide tutorial level information about security, connectivity, PDLs, or WorkCentre
roducts features and functions. This information is readily available elsewhere. We assume that the reader has a
working knowledge of these ty es of to ics. However, a number of references are included in the A endix.
1.2. Target Audience
The target audience for this document is Xerox field ersonnel and customers concerned with IT security.
1.3. Disclaimer
The information in this document is accurate to the best knowledge of the authors, and is rovided without warranty
of any kind. In no event shall Xerox Cor oration be liable for any damages whatsoever resulting from user's use or
disregard of the information rovided in this document including direct, indirect, incidental, consequential, loss of
business rofits or s ecial damages, even if Xerox Cor oration has been advised of the ossibility of such damages.

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2. Device Descri tion
This roduct consists of an in ut document handler and scanner, marking engine including a er ath, controller,
and user interface.
Figure 2-1 WorkCentre Mu tifunction System
2.1. Security-relevant Subsystems
2.1.1. Physical Partitioning
The security-relevant subsystems of the roduct are artitioned as shown in Figure 2-2.
Document Feeder & Scanner
(IIT)
Marking Engine (IOT)
Pa er Trays
Gra hical User
Interface
(GUI)
High-ca acity
feeder accessory
High-volume finisher and
booklet maker accessories

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PCI Bus
Optical
interface
Buttons and Display
Physical external
interface
Button and TOE internal wiring
(proprietary)
Figure 2-2 System functiona b ock diagram
2.1.2. Security Functions allocated to Subsystems
Security Function Subsystem
Image Overwrite
Controller
Gra hical User Interface
System Authentication
Controller
Gra hical User Interface
Network Authentication
Controller
Gra hical User Interface
Security Audit
Controller
Cry togra hic O erations
Controller
User Data Protection – SSL
Controller
User Data Protection – IP Filtering
Controller
User Data Protection – IPSec
Controller
User Data Protection – Disk Encry tion
Controller
Network Management Security
Controller
Fax Flow Security
Fax Module
Controller
Gra hical User Interface

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Security Function Subsystem
Security Management
Controller
Gra hical User Interface
Tab e 1 Security Functions a ocated to Subsystems
2.2. Controller
2.2.1. Pur ose
The controller rovides both network and direct-connect external interfaces, and enables co y, rint, email, network
scan, server fax, internet FAX, and LanFAX functionality. Network scanning, server fax, internet fax, and LanFax, are
standard features.
NOTE: The Copier on y version inc udes a hard drive which is used to ho d Operating System software, printing
app ications, and jam c earance videos. Job Image data is not stored on this disk.
Image Overwrite, which is included as a standard feature, enables both Immediate and On-Demand overwrite of any
tem orary image data created on disk. The controller also incor orates an o en-source web server (A ache) that
ex orts a Web User Interface (WebUI) through which users can submit jobs and check job and machine status, and
through which system administrators can remotely administer the machine.
The controller contains the image ath, which uses ro rietary hardware and algorithms to rocess the scanned
images into high-quality re roductions. Scanned images may be tem orarily buffered in DRAM to enable electronic
re-collation, sometimes referred to as scan-once/ rint-many. When roducing multi le co ies of a document, the
scanned image is rocessed and buffered in the DRAM in a ro rietary format. Extended buffer s ace for very large
documents is rovided on the network disk. The buffered bitma s are then read from DRAM and sent to the Image
Out ut Terminal (IOT) for marking on hardco y out ut. For long documents, the roduction of hardco y may begin
before the entire original is scanned, achieving a level of concurrency between the scan and mark o erations.
The controller o erating system is Wind River Linux, kernel v. 2.6.20+. (Note: Consistent with Flaw Remediation, this
baseline may be u dated as indicated by the ‘+’ sign. Unnecessary services such as rsh, telnet and finger are disabled
in the OS. FTP is used in client-only mode by the network scanning feature for the filing of scanned images and the
retrieval of Scan Tem lates; however the controller does not contain an FTP server.
The controller works with the Gra hical User Interface (GUI) assembly to rovide system configuration functions. A
System Administrator PIN must be entered at the GUI in order to access these functions.
2.2.2. Memory Com onents
Vo ati e Memory
Type (SRAM, DRAM,
etc)
Size
User
Modifiab e
(Y/N)
Function or Use
Process to Sanitize
DDR2 SDRAM
U gradeable to
1GB
2GB
N Single Board Controller
(System and user image stored)
Subsequent jobs overwrite
the data and all images are
lost at ower off or reboot.
Additiona Information: There are also a number of RAM buffers in the video ath that are used for image
mani ulation (Reduce/Enlarge, etc.), and all have no data retention ca ability. When ower is removed all data is lost.
These buffers are ty ically built into the ASICs. Ty ical bleed down time for all volatile memory is 10 seconds.

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Non-Vo ati e Memory
Type (F ash, EEPROM,
etc)
Size
User
Modifiab e
(Y/N)
Function or Use
Process to Sanitize
Flash ROM 128MB N Single Board Controller
(Boot code and system file)
No user image data stored
NVRAM 128KB N Single Board Controller
(Xerogra hic set oints)
No user image data stored.
Additiona Information: There are other non volatile memory devices in the system, but these are used solely for
low level I/O control. Some exam les of this distributed control are:
•Power distribution, Photorece tor and main drive motors control
•Raster Out ut Scanner (ROS)
•Pa er Registration
• Finisher
Tab e 2 Contro er memory components
Media and Storage
Type (disk drives,
tape drives, CF/SD/XD
memory cards, etc.):
Removab e
Y / N
Size:
User
Modifiab e:
Y / N
Function:
Process to Sanitize:
Disk drive N 80GB N Network Controller
A lication and Co y
Controller A lication
software. Image
storage, rocessing and
Overflow EPC image
storage.
On Demand Image
Overwrite
Fax Card N 512MB N User FAX image data
stored
User image data
overwritten at the
com letion of each fax
job.
Overwritten by
Standard or Full
ODIO o eration
Tab e 3 Hard Disk Drives

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2.2.3. External Connections
Figure 2-3 Back pane connections
Interface Description / Usage
FAX line 1, RJ-11 Su orts FAX Modem T.30 rotocol only
FAX line 2, RJ-11 Su orts FAX Modem T.30 rotocol only
USB Host Port
Software u grade
PSW USB Target Port
Direct-connect rinting; Xerox diagnostic tools (PSW and CAT)
and Xerox co ier assistant
Ethernet 10/100/1000 Network connectivity
Scanner Pro rietary connection between the scanner and controller
carrying ower and communications
Serial Port Engineering develo ment debug; default state is disabled
Foreign Device Interface (FDI) Allows connection of o tional access control hardware
Tab e 4 Contro er Externa Connections
2.2.4. USB Ports
The WorkCentre contains a host connector for a USB flash drive, enabling u load of software u grades and
download of network logs or machine settings files.
Autorun is disabled on this ort. No executable files will be acce ted by the ort.
Modifying the software u grade, network logging or saved machine settings files will make the files unusable on a
WorkCentre .
The data in the network logging file is encry ted and can only be decry ted by Xerox service.
The machine settings that can be saved and restored by a service technician are limited to controller and fax
arameters that are needed for normal o eration. For exam le, the fax address book can be saved and restored by a
service technician.
There is no method for a user, administrator or technician to move image data from the WorkCentre to a USB device.
USB
USB port and ocation Purpose
USB Host orts Software u grade