Privilege Escalation II

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Del curso dictado por Vanderbilt University

Engineering Maintainable Android Apps

118 calificaciones

Vanderbilt University

Engineering Maintainable Android Apps

118 calificaciones

Curso 4 de 5 en SpecializationAndroid App Development

Engineering Maintainable Android Apps, which is a 4 week MOOC that shows by example various methods for engineering maintainable Android apps, including test-driven development methods and how to develop/run unit tests using JUnit and Robotium (or equivalent automated testing frameworks for Android), as well as how to successfully apply common Java/Android software patterns to improve the extensibility and clarity of Android apps. Students will work on the appropriate automated unit quizzes, based on the material covered in the lecture videos. These lessons will demonstrate the benefits of good software engineering practices that are targeted at creating maintainable code for mobile apps. There will be roughly 3-4 hours of student engagement time per week, including video lectures, and quizzes. The ordering of the modules within the course is designed to be flexible. In particular, students can watch the videos in whatever order suits their experience and needs, e.g., they may want to watch the unit testing videos prior to the software pattern videos if they prefer to learn about unit testing first.

De la lección

Security & Sustainability II

This module provides an introduction to Unit Testing using the Junit 4.0 Framework in Android, as well as an introduction to Testing Frameworks using the Robotium open-source test framework for writing graybox testing cases to automate the testing of multi-Activity Android apps.

Traditional App Accounts3:15

Traditional vs. Mobile App Accounts5:28

App Account Mapping to Linux Users4:45

Apps Lie & Steal4:23

How Android Protects Apps13:52

What Android Does Not Protect14:20

The Challenges of Secure Coding2:48

Security Vulnerability Walkthrough7:30

The iRemember App Example3:38

Privilege Escalation I5:40

Privilege Escalation II4:07

Privilege Escalation III6:22

Course Wrap-up13:59

Conoce a los instructores

Dr. Douglas C. Schmidt
Professor of Computer Science and Associate Chair of the Computer Science and Engineering Program
Electrical Engineering and Computer Science
Michael Walker
Instructor - Graduate Student pursuing PhD in Computer Science
EECS
Dr. C. Jules White
Assistant Professor of Computer Science
Electrical Engineering and Computer Science

[MUSIC]

Let's look at another way that an open service, that can be invoked

by an intent might accidentally leak a capability that another app does

not currently have permission to access through that intent-based service.

So let's assume that we have a service that allows an app to

download an arbitrary file by simply sending our app an intent and

you tell our app, what is the URL of the file that you want to download?

Our app will automatically go and download that file, store it to disk and

then return via intent to whatever app called us the location

of the file that we downloaded.

So, we're creating a generic download service

that we want to expose to other apps on the device via an intent.

Well, let's say that your malware and

you want to download a malicious payload to the device.

So for example, you want to download some extra code that's going to be used to

attack the device.

Well, if you're malware and you have no permissions,

you look a lot less suspicious to the user.

So, you can have no permissions.

And essentially, the user is going to think, well, it's unlikely this app is

going to do anything very malicious, because it has no permissions.

But in reality, because you've created this app that allows

another app to send an intent to download something.

So we're going to send an intent and

we're going to say, download attack payload.

So we'll go and tell it this malicious payload that

we want to get downloaded, it'll go off to the internet and

get that payload for us and return the attack payload.

And then it will return to this piece of malware in its on result.

The file where the attack payload is stored.

So in this case, what we've got is we've got an app that's creating a service,

that's intended to be helpful to other apps in the device.

But because it allows any app to send in an intent saying,

go and download something for me and then it blindly goes and

accesses the internet which is a capability that it has.

Downloads the payload for it and

then returns the payload to whoever sent it that intent.

Again, we're bypassing Android's built-in permissions mechanism by

having a piece of malware that's essentially manipulating another app into

getting access to a capability in the device.

In this case, access to the internet that it doesn't currently have.

So one of the things you have to be cognizant of is that although you can

create apps that can talk to other apps, that when you talk to those other

apps that you talk to them in a way and take commands or other things from them in

a way that doesn't break the permission model on the Android.

That if you're going to use something like internet or the camera that you make

sure that the way that you're using and accessing that thing and

the data you're returning to the application that's asking for

access to it isn't done in such a way that you're breaking the permissions or

circumventing what the user intended that app to have access to.

If the user didn't give a piece of malware or any informations, your app shouldn't

be exposing additional capabilities or permissions to that malware by not

checking the capabilities that it has when it begins interacting with it.

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