Blackbe;rry ENTERPRISE SOLUTION SECURITY - ERASING FILE SYSTEMS ON DEVICES -... Guide d'installation

Erasing file systems on BlackBerry devices

Technical Overview

Erasing file systems on BlackBerry devices

Contents

Types of file storage systems on BlackBerry devices ......................................................................................... 2

User data that the BlackBerry device stores................................................................................................... 2

Types of remote BlackBerry device wipes ............................................................................................................ 4

Erasing data from BlackBerry device memory and making the BlackBerry device unavailable

(standard security wipe) ..................................................................................................................................... 5

Resetting a BlackBerry device to factory default settings............................................................................6

Unbinding the smart card from the BlackBerry device .................................................................................6

Actions that the BlackBerry device performs during BlackBerry device wipe processes ............................ 7

2Erasing file systems on BlackBerry devices

Types of file storage systems on BlackBerry devices

Type of memory Description

flash memory (internal to

device)

Flash memory is a file system that stores application and user data on the

BlackBerry® device. It cannot be physically removed from the BlackBerry

device. Sections of flash memory can store files that the user downloads or

saves manually to device memory.

An NV store (non-volatile store) persists in flash memory and can only be

overwritten by the BlackBerry device operating system. Third-party

application code cannot write to the NV store. The device erases flash

memory during a device wipe only.

memory card file system

(external or internal to device)

Stores files that the user saves manually on the BlackBerry device. The

user might save files to an external memory file system (for example, a

removable media card) or to internal device memory that the BlackBerry

device treats and exposes like an external memory file system. The

BlackBerry device erases internal ‘memory card’ file systems during a

device wipe.

External memory file systems can be installed, accessed, and encrypted on

the BlackBerry device. The BlackBerry device does not erase external

memory file systems during a device wipe.

User data that the BlackBerry device stores

The BlackBerry device stores user data items, including the following:

Item Description

AutoText all text that automatically replaces the text a BlackBerry device user types

BlackBerry® Browser •content that web sites or third-party applications push to the

BlackBerry device

•web sites that the user saves on the BlackBerry device

•browser cache

calendar •subject

•location

•organizer

•attendees

•notes included in the appointment or meeting request

contacts (in the address book) all information except the contact title and category

Note: Set the Force Include Address Book In Content Protection IT policy

rule to True to prevent the BlackBerry device user from turning off the

Include Address Book option on the BlackBerry device. The BlackBerry

device permits the Caller ID and Bluetooth Address Book transfer features

to work when content protection is turned on and the BlackBerry device is

locked.

email •subject

•email addresses

•message body

•attachments

Erasing file systems on BlackBerry devices 3

Item Description

memo list •title

•information included in the body of the note

RSA SecurID® Library the contents of the .sdtid file seed stored in flash memory

tasks •subject

•information included in the body of the task

third-party application data all data associated with third-party applications that are installed on the

BlackBerry device

4Erasing file systems on BlackBerry devices

Types of remote BlackBerry device wipes

The BlackBerry device wipe process is designed to delete all data in internal memory and overwrite that memory

with zeroes.

Type Description

factory default device wipe This method of removing BlackBerry device data is initiated by the

BlackBerry® Enterprise Server administrator remotely using the Remote

Wipe Reset to Factory Defaults IT policy rule. See “Resetting a BlackBerry

device to factory default settings” on page 6 for more information.

security wipe of data (standard

security wipe)

This method of removing BlackBerry device data is initiated by the

BlackBerry Enterprise Server administrator remotely, or by the BlackBerry

device user locally on the BlackBerry device. See “Erasing data from

BlackBerry device memory and making the BlackBerry device unavailable”

on page 5 for more information.

security wipe of data and third-

party applications (standard

security wipe with Include third

party applications option

selected on device)

This method of removing BlackBerry device data is initiated by the

BlackBerry device user locally on the BlackBerry device. The BlackBerry

Enterprise Server administrator can achieve the same result by performing

a factory default device wipe. See “Removing third-party applications

during a user-initiated security wipe” on page 5 for more information.

security wipe of data on a

content-protected device

(standard security wipe on a

content-protected device)

If content protection is turned on, during a security wipe the BlackBerry

device uses a memory scrub process to overwrite the BlackBerry device

flash memory file system. The BlackBerry memory scrub process complies

with United States government requirements for clearing sensitive user

data, including Department of Defense directive 5220.22-M and National

Institute of Standards and Technology Special Publication 800-88.

The BlackBerry device performs the following actions, depending on the method used to wipe the internal device

memory:

BlackBerry device action Description

deletes user data The BlackBerry device permanently deletes all user data in memory.

deletes corporate PIN-to-PIN

encryption key

The BlackBerry device permanently deletes its references to the corporate

peer-to-peer, or PIN-to-PIN, encryption key in memory.

deletes the master encryption

key

The BlackBerry device permanently deletes its references to the master

encryption key in memory.

unbinds the smart card (if

applicable)

The BlackBerry device permanently deletes the smart card binding

information from the NV store so that a user can authenticate with the

BlackBerry device using a new smart card.

unbinds the IT policy The BlackBerry device permanently deletes the IT policy public key from

its NV store so that it can receive a new IT policy and IT policy public key

from a BlackBerry Enterprise Server.

password history The BlackBerry device permanently deletes its references to past

BlackBerry device password hashes in memory.

stored BlackBerry MDS device

policy

The BlackBerry device permanently deletes its BlackBerry® Mobile Data

System device policy from its NV store.

deletes stored IT policy The BlackBerry device permanently deletes its stored IT policy.

deletes third-party applications The BlackBerry device permanently deletes all third-party applications

stored on the BlackBerry device.

Erasing file systems on BlackBerry devices 5

BlackBerry device action Description

overwrites BlackBerry device

memory if content protection is

turned on

The BlackBerry device uses a memory scrub process to overwrite the

BlackBerry device flash memory file system.

For more information, see “Appendix D: BlackBerry device wipe process” in the BlackBerry Enterprise Solution

Security Technical Overview.

Erasing data from BlackBerry device memory and making the BlackBerry device

unavailable (standard security wipe)

A BlackBerry device that is not physically connected to a computer is designed to permanently delete its user

and application data when any of the following events occur:

•The user clicks Wipe Handheld (in the Security Options) on the BlackBerry device.

•The user types the password incorrectly more times than the Set Maximum Password Attempts IT policy rule

allows on the BlackBerry device. (The default is ten attempts.)

•The BlackBerry Enterprise Server administrator sends the Erase Data and Disable Handheld IT

administration command to the BlackBerry device from the BlackBerry Manager.

•The BlackBerry Enterprise Server administrator sends the Erase Data and Disable Handheld IT

administration command with a delay (in hours, up to 168 hours) to the BlackBerry device from the

BlackBerry Manager.

A BlackBerry device is designed to erase its user and application data and all applications when it is physically

connected to a computer and any of the following events occur:

•The BlackBerry device user runs the application loader tool in the BlackBerry® Desktop Software and types

the password incorrectly more times than the Set Maximum Password Attempts IT policy rule allows in the

application loader tool prompt. (The default is ten attempts.)

The BlackBerry device user can also use the application loader tool in the BlackBerry Desktop Software to

erase all user and application data on the BlackBerry device, but choose not to erase the BlackBerry device

applications.

•The BlackBerry Enterprise Server administrator clicks Wipe Handheld File System in the BlackBerry

Manager. This option deletes all data and applications from the BlackBerry device even if the service books

do not exist on the BlackBerry device (in other words, if there is no connection between the BlackBerry

Enterprise Server and the BlackBerry device).

Removing third-party applications during a user-initiated security wipe

When the user clicks Wipe Handheld (in the Security Options) on the BlackBerry device, the user can select the

Include third party applications option at the same time. If the user selects this option, when the BlackBerry

device permanently deletes its stored user data during the device wipe, it will also remove all of its third-party

applications and application data.

Requiring a delay on remote BlackBerry device wipes

The BlackBerry Enterprise Server administrator can set the following IT policy rules to require that the remote

BlackBerry device automatically delete its user and application data.

IT policy rule Description

Secure Wipe Delay After IT

Policy Received

Set this IT policy rule to a period of time, in hours, after which, if the

BlackBerry device has not successfully received IT policy updates or IT

administration commands, the BlackBerry device permanently deletes its

user and application data.

Secure Wipe Delay After Lock

Set this IT policy rule to a period of time, in hours, after which, if the user has

not unlocked the BlackBerry device, the BlackBerry device permanently

deletes its user and application data.

6Erasing file systems on BlackBerry devices

IT policy rule Description

Secure Wipe if Low Battery

Set this IT policy rule to require that, if the BlackBerry device battery power

is insufficient to receive IT policy updates or IT administration commands,

the BlackBerry device permanently deletes its user and application data.

Resetting a BlackBerry device to factory default settings

The BlackBerry Enterprise Server administrator can use the Remote Wipe Reset to Factory Defaults IT policy rule

to require the BlackBerry device to return to factory default settings when it receives the Erase Data and Disable

Handheld IT administration command over the wireless network. When the BlackBerry Enterprise Server

administrator sets this rule to True and sends the Erase Data and Disable Handheld IT administration command

to the BlackBerry device from the BlackBerry Manager, or the BlackBerry Enterprise Server administrator clicks

Nuke Handheld in the BlackBerry Manager, the BlackBerry device reverts to its factory default settings and

permanently deletes all of the following items:

•user data

•corporate PIN-to-PIN encryption key

•master encryption key

•smart card binding information

•password history

•stored BlackBerry MDS device policy

•record of time elapsed since the BlackBerry device was last turned on

•stored IT policy

•third-party applications and application data

When the BlackBerry device reverts to its factory default settings, it overwrites BlackBerry device internal

memory and, if content protection is turned on, performs a scrub of BlackBerry device memory.

Unbinding the smart card from the BlackBerry device

When the BlackBerry Enterprise Server administrator or the user starts a BlackBerry device wipe, causing the

BlackBerry device to erase its stored user and application data, the BlackBerry device permanently deletes the

smart card binding information from the NV store so that a user can authenticate with the BlackBerry device

using a new smart card.

The BlackBerry Enterprise Server administrator can permanently delete the smart card binding information from

the BlackBerry device manually in the following ways.

•Send the Erase Data and Disable Handheld IT administration command to the BlackBerry device to

permanently delete the binding between a user’s current smart card and the BlackBerry device.

•When the user turns off two-factor authentication, the BlackBerry device turns off two-factor authentication

with the installed smart card and permanently deletes the smart card binding information from the

BlackBerry device.

Erasing file systems on BlackBerry devices 7

Actions that the BlackBerry device performs during BlackBerry device wipe

processes

When the BlackBerry device permanently deletes its stored user and application data, it performs specific

actions, depending on the type of device wipe performed:

Type of device wipe

Standard security wipe

Device wipe actions:

with Include third party

applications option

turned off

with Include third

party applications

option turned on

Factory default

wipe

deletes user data 333

deletes corporate PIN-to-PIN

encryption key 333

deletes master encryption key 333

unbinds IT policy 333

unbinds smart card

333

deletes password history

deletes stored BlackBerry MDS

device policy

deletes record of time elapsed since

the BlackBerry device was last

turned on

deletes stored IT policy

deletes third-party applications 33

overwrites BlackBerry device

memory 333

performs a scrub of BlackBerry

device memory if content

protection is turned on

333

For more information about performing a scrub of BlackBerry device memory, see “Appendix D: BlackBerry

device wipe process” in the BlackBerry Enterprise Solution Security Technical Overview.

8Erasing file systems on BlackBerry devices

Part number: 21625041 Version 1

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