Microsoft Threat modelling tool 2016 | Set 2
In the previous article (i.e., Set 1) we have discussed about the introduction of Microsoft threat modelling Tool- from where to download the tool, steps to install the tool, components available for modelling the system using Data Flow Diagram.
In this article we will be discussing the list of attributes for each element and the values of these attributes that are available to the user.
Properties for Processes –
Element Name Attribute Name Values Generic Process Code Type Managed/ Unmanaged Running As Kernel System Network Service Local Service Administrator Standard User with Elevation Standard User Without Elevation Windows Store App Isolation Level AppContainer Low Integrity Level MOICE Sandbox Accepts Input From Any Remote User or Entity Kernel, System or Local Admin Local or Network Service Local Standard User with Elevation Local Standard User without Elevation Windows Store Apps or App Container Processes Nothing Other Implements or uses an Authentication Mechanism Yes/ No Implements or uses an Authorization Mechanism Yes/ No Implements a communication Protocol Yes/ No Sanitizes Input Yes/ No Sanitizes Output Yes/ No Managed Application Code Type * Managed Thick client Code Type * Unmanaged Browser Client Code Type * Unmanaged Browser and ActiveX Plugins ActiveX No/ Yes Browser Plugin Object No/ Yes Windows Store Process Code Type * Managed Context Local/ Web Documents Library Capability Yes/ No Enterprise Authentication capability Yes/ No Internet Client and Server Capability Yes/ No Internet(Client) Capability Yes/ No Location Capability Yes/ No Microphone Capability Yes/ No Music Library Capability Yes/ No Pictures library Capability Yes/ No Private Networks Client & server Capability Yes/ No Proximity Capapbility Yes/ No Removable Storage Capability Yes/ No Shared User Certificates Capability Yes/ No Text Messaging Capability Yes/ No Videos Library Capability Yes/ No Webcam Capability Yes/ No
Properties for Data Store –
|Element Name||Attribute Name||Value|
|Generic Data Store||Stores Credentials||No/ Yes|
|Stores Log Data||No/ Yes|
|Write Access||Yes/ No|
|Removal Storage||Yes/ No|
|Store Type||SQL Relational database|
|Non Relational Database|
|Files System||File System Type||NTFS/ ExFat/ FAT/ ReFS/ IFS/ UDF/ Other|
|Cookies||HTTP Only||Yes/ No|
|Calender Events||Yes/ No|
|SMS Messages||Yes/ No|
|Cache Credentials||Yes/ No|
|Enterprise Data||Yes/ No|
|Messaging Data||Yes/ No|
|SIM Storage||Yes/ No|
|Other Data||Yes/ No|
Properties for External Interactor –
Element Name Attribute Name Values External Interactor Authenticates Itself No/ Yes Type Not Selected/ Code/Human Microsoft No/ Yes Browser Type * Code External Web Application Type * Code External Web Service Type * Code Human User Type * Human Windows Runtime Type * Code Windows .NET Runtime Type * Code Windows RT Runtime Type * Code
Properties for DataFlow –
Element Name Attribute Name Values Generic Data Flow Physical Network Wire/ Wifi/ Bluetooth/ 2G-4G Source Authenticated Yes/ No Destination Authenticated Yes/ No Provides Confidentiality Yes/ No Provides Integrity Yes/ No Transmits XML Yes/ No Contains Cookies Yes/ No SOAP Payload Yes/ No REST Payload Yes/ No RSS Payload Yes/ No JSON Payload Yes/ No
Note – Asterisk (*) means the attribute values are non modifiable.
Apart from above discussed three main panes. there are three more important options:
- Threat Model Information –
You can select this dialog from the FILE Menu. This helps user to add basic information about the threat model in order to establish the risk of the component. It includes following questions:
- Threat Model Name
- High Level System Description
- External Dependencies
- Messages –
You can select this dialog from the VIEW Menu. This allows to identify warnings, errors or inconsistencies in the knowledge base.
- Notes –
This dialog is also available from VIEW Menu. This is not counted during threat generation or analysis. Notes are basically the comments recorded during model discussion.
For the sample I have chosen the Online Shopping System for the DFD Generation and Consequent threat analysis.
There are three entities in the system:
- Administrator: Its job is to login, make changes to credentials of Administrator Account, Add product details, Update Product Details.
- Customer: Responsibilities include login, handle its account, search product, purchase product
- Sales Manager: It performs following operations in the system – Login, Modify Sales Account.
Thus there are 3 external interactors, 8 processes, 6 Data Stores and 34 Data Flow. I am attaching a snapshot of how DFD looks in the Microsoft Threat Modelling tool and also the original DFD for reference.
DFD in Microsoft Threat Modelling Tool –
Original DFD –
Please note this is just a sample system not a actual functioning system so the understanding of the system and inclusion/ exclusion of process/ external interactors/ data flows/ data stores vary from person to person.
In the next article we will see how to generate threat report for the sample system.