Android Hacker Book

577 Pages·2014·9.03 MB·English

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Android™ Hacker’s Handbook

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Joshua J. Drake
Pau Oliva Fora
Zach Lanier
Collin Mulliner
Stephen A. Ridley
Georg Wicherski

Android™ Hacker’s
Handbook

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Android™ Hacker’s Handbook

Published by
John Wiley & Sons, Inc.
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Indianapolis, IN 46256

www.wiley.com

Copyright © 2014 by John Wiley & Sons, Inc., Indianapolis, Indiana

ISBN: 978-1-118-60864-7
ISBN: 978-1-118-60861-6 (ebk)
ISBN: 978-1-118-92225-5 (ebk)

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Joshua J. Drake is a Director of Research Science at Accuvant LABS. Joshua
focuses on original research in areas such as reverse engineering and the analy-
sis, discovery, and exploitation of security vulnerabilities. He has over 10 years
of experience in the information security fi eld including researching Linux
security since 1994, researching Android security since 2009, and consulting
with major Android OEMs since 2012. In prior roles, he served at Metasploit
and VeriSign’s iDefense Labs. At BlackHat USA 2012, Georg and Joshua demon-
strated successfully exploiting the Android 4.0.1 browser via NFC. Joshua spoke
at REcon, CanSecWest, RSA, Ruxcon/Breakpoint, Toorcon, and DerbyCon. He
won Pwn2Own in 2013 and won the DefCon 18 CTF with the ACME Pharm
team in 2010.

Pau Oliva Fora is a Mobile Security Engineer with viaForensics. He has pre-
viously worked as R+D Engineer in a wireless provider. He has been actively
researching security aspects on the Android operating system since its debut
with the T-Mobile G1 on October 2008. His passion for smartphone security has
manifested itself not just in the numerous exploits and tools he has authored
but in other ways, such as serving as a moderator for the very popular XDA-
Developers forum even before Android existed. In his work, he has provided
consultation to major Android OEMs. His close involvement with and observa-
tion of the mobile security communities has him particularly excited to be a
part of pulling together a book of this nature.

Zach Lanier is a Senior Security Researcher at Duo Security. Zach has
been involved in various areas of information security for over 10 years. He
has been conducting mobile and embedded security research since 2009,

About the Authors

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ranging from app security, to platform security (especially Android), to device,
network, and carrier security. His areas of research interest include both
offensive and defensive techniques, as well as privacy-enhancing technologies.
He has presented at various public and private industry conferences, such
as BlackHat, DEFCON, ShmooCon, RSA, Intel Security Conference, Amazon
ZonCon, and more.

Collin Mulliner is a postdoctoral researcher at Northeastern University. His
main interest lies in security and privacy of mobile and embedded systems with
an emphasis on mobile and smartphones. His early work dates back to 1997, when
he developed applications for Palm OS. Collin is known for his work on the (in)
security of the Multimedia Messaging Service (MMS) and the Short Message
Service (SMS). In the past he was mostly interested in vulnerability analysis and
offensive security but recently switched his focus the defensive side to develop
mitigations and countermeasures. Collin received a Ph.D. in computer science
from Technische Universität Berlin; earlier he completed his M.S. and B.S. in
computer science at UC Santa Barbara and FH Darmstadt.

Ridley (as his colleagues refer to him) is a security researcher and author with
more than 10 years of experience in software development, software security, and
reverse engineering. In that last few years Stephen has presented his research
and spoken about reverse engineering and software security on every continent
(except Antarctica). Previously Stephen served as the Chief Information Security
Offi cer of Simple.com, a new kind of online bank. Before that, Stephen was
senior researcher at Matasano Security and a founding member of the Security
and Mission Assurance (SMA) group at a major U.S defense contractor, where
he specialized in vulnerability research, reverse engineering, and “offensive
software” in support of the U.S. Defense and Intelligence community. At pres-
ent, Stephen is principal researcher at Xipiter (an information security R&D
fi rm that has also developed a new kind of low-power smart-sensor device).
Recently, Stephen and his work have been featured on NPR and NBC and in
Wired, the Washington Post, Fast Company, VentureBeat, Slashdot, The Register, and
other publications.

Georg Wicherski is Senior Security Researcher at CrowdStrike. Georg
particularly enjoys tinkering with the low-level parts in computer security;
hand-tuning custom-written shellcode and getting the last percent in exploit
reliability stable. Before joining CrowdStrike, Georg worked at Kaspersky and
McAfee. At BlackHat USA 2012, Joshua and Georg demonstrated successfully
exploiting the Android 4.0.1 browser via NFC. He spoke at REcon, SyScan,
BlackHat USA and Japan, 26C3, ph-Neutral, INBOT, and various other confer-
ences. With his local CTF team 0ldEur0pe, he participated in countless and won
numerous competitions.

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About the Authors

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Rob Shimonski (www.shimonski.com) is a best-selling author and editor with
over 15 years’ experience developing, producing and distributing print media
in the form of books, magazines, and periodicals. To date, Rob has successfully
created over 100 books that are currently in circulation. Rob has worked for
countless companies that include CompTIA, Microsoft, Wiley, McGraw Hill
Education, Cisco, the National Security Agency, and Digidesign.
Rob has over 20 years’ experience working in IT, networking, systems, and
security. He is a veteran of the US military and has been entrenched in security
topics for his entire professional career. In the military Rob was assigned to a
communications (radio) battalion supporting training efforts and exercises.
Having worked with mobile phones practically since their inception, Rob is an
expert in mobile phone development and security.

About the Technical Editor

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Executive Editor
Carol Long

Project Editors
Ed Connor
Sydney Jones Argenta

Technical Editor
Rob Shimonski

Production Editor
Daniel Scribner

Copy Editor
Charlotte Kughen

Editorial Manager
Mary Beth Wakefi eld

Freelancer Editorial Manager
Rosemarie Graham

Associate Director of Marketing
David Mayhew

Marketing Manager
Ashley Zurcher

Business Manager
Amy Knies

Vice President and Executive
Group Publisher
Richard Swadley

Associate Publisher
Jim Minatel

Project Coordinator, Cover
Todd Klemme

Proofreaders
Mark Steven Long
Josh Chase, Word One

Indexer
Ron Strauss

Cover Designer
Wiley

Credits

Cover Image
The Android robot is reproduced or modifi ed from work created and shared
by Google and used according to terms described in the Creative Commons
3.0 Attribution License.

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I thank my family, especially my wife and son, for their tireless support and
affection during this project. I thank my peers from both industry and academia;
their research efforts push the boundary of public knowledge. I extend my
gratitude to: my esteemed coauthors for their contributions and candid discus-
sions, Accuvant for having the grace to let me pursue this and other endeavors,
and Wiley for spurring this project and guiding us along the way. Last, but not
least, I thank the members of #droidsec, the Android Security Team, and the
Qualcomm Security Team for pushing Android security forward.

— Joshua J. Drake

I’d like to thank Iolanda Vilar for pushing me into writing this book and sup-
porting me during all the time I’ve been away from her at the computer. Ricard
and Elena for letting me pursue my passion when I was a child. Wiley and all
the coauthors of this book, for the uncountable hours we’ve been working on this
together, and specially Joshua Drake for all the help with my broken English. The
colleagues at viaForensics for the awesome technical research we do together.
And fi nally all the folks at #droidsec irc channel, the Android Security com-
munity in G+, Nopcode, 48bits, and everyone who I follow on Twitter; without
you I wouldn’t be able to keep up with all the advances in mobile security.

— Pau Oliva

Acknowledgments

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Acknowledgments

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I would like to thank Sally, the love of my life, for putting up with me; my
family for encouraging me; Wiley/Carol/Ed for the opportunity; my coauthors
for sharing this arduous but awesome journey; Ben Nell, Craig Ingram, Kelly
Lum, Chris Valasek, Jon Oberheide, Loukas K., Chris Valasek, John Cran, and
Patrick Schulz for their support and feedback; and other friends who’ve helped
and supported me along the way, whether either of us knows it or not.

— Zach Lanier

I would like to thank my girlfriend Amity, my family, and my friends and
colleagues for their continued support. Further, I would like to thank my advi-
sors for providing the necessary time to work on the book. Special thanks to
Joshua for making this book happen.

— Collin Mulliner

No one deserves more thanks than my parents: Hiram O. Russell, and Imani
Russell, and my younger siblings: Gabriel Russell and Mecca Russell. A great
deal of who (and what) I am, is owed to the support and love of my family. Both
of my parents encouraged me immensely and my brother and sister never cease
to impress me in their intellect, accomplishments, and quality as human beings.
You all are what matter most to me. I would also like to thank my beautiful fi an-
cée, Kimberly Ann Hartson, for putting up with me through this whole process
and being such a loving and calming force in my life. Lastly, I would like to
thank the information security community at large. The information security
community is a strange one, but one I “grew up” in nonetheless. Colleagues
and researchers (including my coauthors) are a source of constant inspiration
and provide me with the regular sources of news, drama, and aspirational goals
that keep me interested in this kind of work. I am quite honored to have been
given the opportunity to collaborate on this text.

— Stephen A. Ridley

I sincerely thank my wife, Eva, and son, Jonathan, for putting up with me
spending time writing instead of caring for them. I love you two. I thank Joshua
for herding cats to make this book happen.

— Georg Wicherski

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Introduction
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Chapter 1
Looking at the Ecosystem
1

Chapter 2
Android Security Design and Architecture
25

Chapter 3
Rooting Your Device
57

Chapter 4
Reviewing Application Security
83

Chapter 5
Understanding Android’s Attack Surface
129

Chapter 6
Finding Vulnerabilities with Fuzz Testing
177

Chapter 7
Debugging and Analyzing Vulnerabilities
205

Chapter 8
Exploiting User Space Software
263

Chapter 9
Return Oriented Programming
291

Chapter 10
Hacking and Attacking the Kernel
309

Chapter 11
Attacking the Radio Interface Layer
367

Chapter 12
Exploit Mitigations
391

Chapter 13
Hardware Attacks
423

Appendix A Tool Catalog
485

Appendix B Open Source Repositories
501

Appendix C References
511

Index
523

Contents at a Glance