Health Management Scenario

May 3, 2023 Hailiang Mei, [email protected]/e Computer Science, System Architecture and Networking

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Hailiang [email protected]

Security and Privacy Concern in Remote Personal Device Management

Framework


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Outline• Background of RPDM

– Why RPDM is important• Security threat

– Attack tree model and threat analysis• Examining current RDM systems

– SNMP, VNC, MRDP, Web-based• Design of RPDM framework

– Based on SyncML DM• Conclusion and future work


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Background of RPDM

3 Repair

2 Diagnosis

1 Observing

Remote serverRemote server can be within local network or at service provider’s site

Self observes problem + Remote diagnosis + Remote Repair


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Why RPDM is Important?• Recent studies show that there are at least

4 times as many electronic machines in the world as there are people. – This gap is still increasing fast– New devices require maintenance, but personnel

are expensive• An online survey shows 57% users feel

befuddled by their computer, mobile phone, home security system, etc.


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Attack Tree ModelThreats

Unintended threats

Deliberate threat (attack)

Nature threats

Removing important

componentLost

password

Active Passive

Interception

Traffic analysis

Repudiation

DoS

Interruption

Impersonation

Replay

Modification

Dictionary attack

We are going to prevent


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Threat Analysis (one example)

Security requirement

Attack Techniques Confidentiality

Integrity Availability

Non-repudiation

VR

R.1 (Impersonation, dictionary attack) Fabricate the operator account

Y D

R.2 (Modification) Modifying data in the diagnosis message

Y Y B

R.3 (Modification, repudiation) Misusing visualization tool

Y Y C

R.4 (Impersonation) IP spoofing

Y A

R.5 (Repudiation) Deny the executed diagnosis by end user or operator

Y B

Vulnerability Rating (VR): A Probable; B Highly Possible; C Possible; D Unlikely; E Impossible.


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Evaluation Factors• System load & Network load

– criteria related to performance• Expressive power

– indicates the generalization of the technique

• Device IQ– defines how intelligent the target device is when it

is being managed• Security

– the most important concern


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Simple Network Management Protocol

UDP

IP IP

SNMP manager

SNMP

SNMP agent

SNMP

MIB

set/get requests

response and traps

read/change

managing device managed device

TCP TCP UDP


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Virtual Network Computing


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Virtual Network Computing


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Web Server

•The device runs a small web server application

•A service runs on the device to generate run-time HTML file

•The remote terminal manager access the device via the web browser and execute scripts on the device


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Web Server (example)


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SyncML DM (OMA)OMA DM

Inside client

Server

DM protocol

root

Vendor SyncML

… X*

… …

client

Data Synch protocol•Add•Get•Replace•Exec

Logical tree for addressing purposes.In scope of DM

standard!

proprietaryWAPclient

proprietaryupgrade

client

Over the air


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SyncML DM (OMA)OMA DM

• Server<Get>

<CmdID>4</CmdID> <Item> <Target> <LocURI>Vendor/Ring_signals/Default_ring</LocURI> </Target> </Item>

</Get>

• Client<Results>

<CmdRef>4</CmdRef> <CmdID>7</CmdID> <Item>

<Data>MyOwnRing</Data></Item>

</Results>


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Comparison of RDM SystemsOMA DM

Evaluation factor

Weight SNMPv3

VNC Web-based

RDP SyncML DM

System load

20% +/- - - - +/-

Network load

20% + - +/- +/- +/-

Expressive power

25% - + +/- + +

Security 25% + - + +/- +

Device IQ 10% + - +/- - +

Equal weight score

20% each

0.4 -0.6 0 -0.2 0.6

Weighted score

0.3 -0.5 0.05 -0.05

0.6

*We define “+”=1, “+/-”=0 and “-”=-1 to calculate the overall performance score


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RPDM Overview

Management server

Management server

Management server

Management server

Management server

•Security

•Privacy

•Performance


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Internal Architecture of RPDM Client Managed Device

HTTP adapter

WSP adapter

OBEX adapter

Authentication manager

ACL

PKs

Connection manager

(De)

encr

yptio

n m

oduleObjects

invocation

Access manager

LoggingmoduleMobj1

Mobjn

Mobj3

Mobj2

Reporter


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Connection Manager

Session existed?

Connection manager receives a new request

Decrypt the message with the known

session key

Log and create response

Call the corresponding object

Authorized?

Send out the response

Check with Authentication

manager

Create error message

Check with Access manager

Receive return value?

Authenticated?

Create ACK response

Setup session key and create a new session

No

No

No

No

Yes

Yes

Yes

Yes


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Authentication Manager• PKI based authentication• MD5 digest authentication

– Digest = H(B64(H(serverrname:password)):nonce)

• PKs database itself is a Mobj, and it can be managed as well if the access right is granted. E.g. a trusted management server can introduce a new management server by adding its public key or its hashed name string into the PKs database.


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Access Control List Tree

•Each node (object) is identified by an URI•Each node has a set of properties•This tree can be extended by “add” message or a new installations on the device•Leaf node can be either a value or a pointer to an executable command

/Add=&Get=&Replace

=&Delete=&Exec=

ObjectAGet=ServerC&Replace=S

erverC

Object1Get=*

ObjectCGet=ServerA&Replace

=ServerA

ObjectBGet=ServerA&Replace=

ServerA

Object2ACL=

Object3Get=ServerB&Replace=Ser

verB&Delete=ServerB


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View of Prototype

Callback functions to Mobjs of managed device

Security and ACL layer

SyncML parser

HTTP handler

CLI-based management server application

Security layer

SyncML parser

HTTP handler

Management server (Debian Linux)

Managed device (Redhat 9 Linux)


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Conclusion• SyncML DM based system offers good

system performance and security protection• Our C prototype is one of the first open

implementations based on the SyncML DM specifications.

• But, the network load is a bit heavy– A “Get” SyncML message is 709 bytes v.s. 81

bytes in SNMP– However, it becomes better for a more realistic

and complex management session


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Future Work• Complete implementation• Think about management server?

Management server

Management server

Management server

Management server

Management server ?


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• Thanks for your attention!


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Apps

GamesMp3 player Agenda

Net

CPUMem

HWOSRRE

Root

Agenda Control

Agenda Display

Agenda Datamanager

I-goTTT


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RDM complexity

Network load

SyncML DM

SNMP

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Health Management Scenario

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