WHO KNOWS NOTHING - DeepSec · PDF fileMobile Fail ::: Cracking open “secure”...
Transcript of WHO KNOWS NOTHING - DeepSec · PDF fileMobile Fail ::: Cracking open “secure”...
Chris John Riley | 26.11.2013 | 2 Mobile Fail ::: Cracking open “secure” Android Containers
@ChrisJohnRiley > whoami
IT Security Analyst / Security Consultant
Raiffeisen Informatik GmbH
R-IT CERT Team
Regular conference speaker
DEF CON | Bsides | Hashdays | SecZone…
blog http://blog.c22.cc
Abject Failure (See Life for reference)
Chris John Riley | 26.11.2013 | 3 Mobile Fail ::: Cracking open “secure” Android Containers
THE WISEST MAN, IS
HE WHO KNOWS, THAT
HE KNOWS NOTHING
SOCRATES: APOLOGY, 21D
Chris John Riley | 26.11.2013 | 5 Mobile Fail ::: Cracking open “secure” Android Containers
Why
Scenario
How
Closer Look
Making it easy
Review
Chris John Riley | 26.11.2013 | 9 Mobile Fail ::: Cracking open “secure” Android Containers
too much
information 01100100 01100101 01110010 01110000
01100100 01100101 01110010 01110000 01111001
01100100 01100101 01110010 01110000 01101001 01100101 01110011 01110100
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Chris John Riley | 26.11.2013 | 13 Mobile Fail ::: Cracking open “secure” Android Containers
Containers
Multiple uses
Pa$$w0rd databases
Corporate mail containers
Secure notes / files
...
Chris John Riley | 26.11.2013 | 17 Mobile Fail ::: Cracking open “secure” Android Containers
The device
is insecure
Chris John Riley | 26.11.2013 | 18 Mobile Fail ::: Cracking open “secure” Android Containers
...or
worse
Chris John Riley | 26.11.2013 | 19 Mobile Fail ::: Cracking open “secure” Android Containers
BYOD *
* Bring Your Own Disease
Chris John Riley | 26.11.2013 | 21 Mobile Fail ::: Cracking open “secure” Android Containers
Solution?
Chris John Riley | 26.11.2013 | 22 Mobile Fail ::: Cracking open “secure” Android Containers
Move the
security closer
to the data!
Chris John Riley | 26.11.2013 | 25 Mobile Fail ::: Cracking open “secure” Android Containers
… I lost my
phone!
Chris John Riley | 26.11.2013 | 26 Mobile Fail ::: Cracking open “secure” Android Containers
314 mobile phones 'stolen
in London every day'
offenders traced three
or four times out of 10
Source: UK Metropolitan Police 01/2013
Chris John Riley | 26.11.2013 | 27 Mobile Fail ::: Cracking open “secure” Android Containers
state of
security Device
Chris John Riley | 26.11.2013 | 30 Mobile Fail ::: Cracking open “secure” Android Containers
KEEP CALM
Chris John Riley | 26.11.2013 | 31 Mobile Fail ::: Cracking open “secure” Android Containers
secure
containers
will save us
Chris John Riley | 26.11.2013 | 32 Mobile Fail ::: Cracking open “secure” Android Containers
… or not
Chris John Riley | 26.11.2013 | 34 Mobile Fail ::: Cracking open “secure” Android Containers
Sc nario .
Chris John Riley | 26.11.2013 | 35 Mobile Fail ::: Cracking open “secure” Android Containers
Scenario
• Given physical access to a device
• What security do “secure” containers provide
• temporary access (< 3 minutes)
• permanent access
Chris John Riley | 26.11.2013 | 39 Mobile Fail ::: Cracking open “secure” Android Containers
remember
Chris John Riley | 26.11.2013 | 40 Mobile Fail ::: Cracking open “secure” Android Containers
secure
containers
will SAVE us
Chris John Riley | 26.11.2013 | 45 Mobile Fail ::: Cracking open “secure” Android Containers
pwn
secure
containers
Chris John Riley | 26.11.2013 | 46 Mobile Fail ::: Cracking open “secure” Android Containers
G AL MY NOT
Chris John Riley | 26.11.2013 | 47 Mobile Fail ::: Cracking open “secure” Android Containers
bypass
device PIN 12
34
Chris John Riley | 26.11.2013 | 48 Mobile Fail ::: Cracking open “secure” Android Containers
r00t the
device
Chris John Riley | 26.11.2013 | 49 Mobile Fail ::: Cracking open “secure” Android Containers
do anything
resembling…
Chris John Riley | 26.11.2013 | 53 Mobile Fail ::: Cracking open “secure” Android Containers
HOW ? O
Chris John Riley | 26.11.2013 | 54 Mobile Fail ::: Cracking open “secure” Android Containers
keep it simple
Chris John Riley | 26.11.2013 | 55 Mobile Fail ::: Cracking open “secure” Android Containers
Android
Debug
Bridge
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ADB – Android Debug Bridge
• Requires USB Debugging Enabled
• Doesn't require ROOTed device
• Root grants further access / makes things trivial
http://developer.android.com/tools/help/adb.html
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adb
functions
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ADB – Android Debug Bridge
• Allows application side-loading
• [un]install applications over adb
• Doesn’t require device to be active
• Can be PIN locked (for some functions)
• New security implemented in 4.3
http://developer.android.com/tools/help/adb.html
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ADB – Android Debug Bridge
• adb backup
• Backup Android device over adb (ICS onwards)
• -system → system data
• -apk → application apk
• Can backup specific application data individually
adb backup com.android.app -f backup.ab
http://developer.android.com/tools/help/adb.html
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• adb restore
• Restore Android backup over adb
• Restore specific application data individually
• with or without application (apk)
adb restore backup.ab
ADB – Android Debug Bridge
http://developer.android.com/tools/help/adb.html
Chris John Riley | 26.11.2013 | 61 Mobile Fail ::: Cracking open “secure” Android Containers
adb pull /sdcard/secret.txt secret.txt
ADB – Android Debug Bridge
• adb pull / push
• Copy data to / from device over adb
• Limited access for non-root users
• no access to application config without root
• Works on locked devices (PIN Protected)
http://developer.android.com/tools/help/adb.html
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ADB – Android Debug Bridge
• adb shell
• Shell access on device
• Send keys / taps
• Limited for non-root users
• Works on locked devices (PIN Protected)
http://developer.android.com/tools/help/adb.html
adb shell
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Supporting Tools
• openssl
• w/ zlib support
• star
• tar tool w/ added functionality we need
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Closer look
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lastpass
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lastpass
• Personal solution (w/ enterprise option)
• Uses online sync
• Can be secured with a PIN
• Can wipe data after 5 false logons
• Restricts screenshots
https://lastpass.com/android
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Can store lastpass.com password
• So users don't need to type it EVERY time
• Reduces security
• Makes it usable!
Chris John Riley | 26.11.2013 | 71 Mobile Fail ::: Cracking open “secure” Android Containers
Why store
the PW?
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_mySecur3L@sTp@$$p@$$w0rd1sDAb0mb&&&:
Easy to remember
Impossible to type!
Chris John Riley | 26.11.2013 | 73 Mobile Fail ::: Cracking open “secure” Android Containers
It's
though
OK
Chris John Riley | 26.11.2013 | 74 Mobile Fail ::: Cracking open “secure” Android Containers
You can
enable a
PIN!
Chris John Riley | 26.11.2013 | 75 Mobile Fail ::: Cracking open “secure” Android Containers
PIN Security
• Limited to 4 digits!
• “auto-Wipe” data
• after 5 false logons
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PIN ==
SECURE!
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AndroidManifest.xml
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<application android:allowBackup=“true”>
AndroidManifest.xml
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Default: true
Chris John Riley | 26.11.2013 | 81 Mobile Fail ::: Cracking open “secure” Android Containers
adb backup com.lastpass.lpandroid –f lp.ab
Chris John Riley | 26.11.2013 | 82 Mobile Fail ::: Cracking open “secure” Android Containers
What good is
an .ab file?
Chris John Riley | 26.11.2013 | 83 Mobile Fail ::: Cracking open “secure” Android Containers
Android Backup (.ab)
• zlib compressed (kinda)
• skip header (24 bytes)
• pipe to openssl w/zlib support
dd if=dropbox.ab bs=24 skip=1 | openssl zlib -d > dropbox.tar
Chris John Riley | 26.11.2013 | 86 Mobile Fail ::: Cracking open “secure” Android Containers
LPandroid.xml
• lastpass.com username
• laspass.com password (encoded)
• PIN (encoded)
• Settings
• ...
Chris John Riley | 26.11.2013 | 87 Mobile Fail ::: Cracking open “secure” Android Containers
<string name="reprompt_tries">
0
</string>
Chris John Riley | 26.11.2013 | 88 Mobile Fail ::: Cracking open “secure” Android Containers
That looks
interesting!
Chris John Riley | 26.11.2013 | 89 Mobile Fail ::: Cracking open “secure” Android Containers
( ) THEORY
Chris John Riley | 26.11.2013 | 90 Mobile Fail ::: Cracking open “secure” Android Containers
if reprompt_tries < 5:
prompt_for_pin()
else
drop_the_DBass()
end
Chris John Riley | 26.11.2013 | 91 Mobile Fail ::: Cracking open “secure” Android Containers
Theory
• reprompt_tries as iterator
• increases till it reaches 5
• Sounds reasonable
• edit the XML and restore it
• Let's set “reprompt_tries” to -9999 then ;)
Chris John Riley | 26.11.2013 | 92 Mobile Fail ::: Cracking open “secure” Android Containers
Proposed Attack
• Backup app data
• Edit XML
• set “reprompt_tries” to -9999
• Repackage
• Restore
Chris John Riley | 26.11.2013 | 94 Mobile Fail ::: Cracking open “secure” Android Containers
0 - adb backup com.lastpass.lpandroid -f lpass.ab
1 - dd if=lpass.ab bs=24 skip=1 | openssl zlib -d > lpass.tar
2 - tar -tf lpass.tar > lpass.list
3 - tar -xvf lpass.tar
4 - edit apps/com.lastpass.lpandroid/sp/LPandroid.xml
5 - star -c -v -f lpass_new.tar -no-dirslash list=lpass.list apps/
6 - dd if=lpass.ab bs=24 count=1 of=lpass_new.ab
7 - openssl zlib -in lpass_new.tar >> lpass_new.ab
8 - adb restore lpass_new.ab
Chris John Riley | 26.11.2013 | 95 Mobile Fail ::: Cracking open “secure” Android Containers
Not the easiest
process...
Chris John Riley | 26.11.2013 | 97 Mobile Fail ::: Cracking open “secure” Android Containers
counter++
Chris John Riley | 26.11.2013 | 98 Mobile Fail ::: Cracking open “secure” Android Containers
good news…
Chris John Riley | 26.11.2013 | 99 Mobile Fail ::: Cracking open “secure” Android Containers
We get
tries 10,000
Chris John Riley | 26.11.2013 | 100 Mobile Fail ::: Cracking open “secure” Android Containers
bad news…
Chris John Riley | 26.11.2013 | 101 Mobile Fail ::: Cracking open “secure” Android Containers
We get
tries 10,000
Chris John Riley | 26.11.2013 | 102 Mobile Fail ::: Cracking open “secure” Android Containers
Let’s make it
easier
Chris John Riley | 26.11.2013 | 103 Mobile Fail ::: Cracking open “secure” Android Containers
No PIN > PIN
Chris John Riley | 26.11.2013 | 104 Mobile Fail ::: Cracking open “secure” Android Containers
<string name="passwordrepromptonactivate">0</string>
<string name="pincodeforreprompt"></string>
<string name="requirepin">0</string>
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PROFIT!
Chris John Riley | 26.11.2013 | 106 Mobile Fail ::: Cracking open “secure” Android Containers
Easier Attack
• Backup app data
• Edit XML
• remove PIN
• Repackage
• Restore
• WIN!
Chris John Riley | 26.11.2013 | 108 Mobile Fail ::: Cracking open “secure” Android Containers
for
points...
Chris John Riley | 26.11.2013 | 109 Mobile Fail ::: Cracking open “secure” Android Containers
Persistence
Chris John Riley | 26.11.2013 | 110 Mobile Fail ::: Cracking open “secure” Android Containers
Persistence
• Backup LastPass from device A
• Edit backup to remove PIN
• Rebuild backup
• Restore backup to device B
• Close & restart to re-sync changes from device A
• Profit?
Chris John Riley | 26.11.2013 | 111 Mobile Fail ::: Cracking open “secure” Android Containers
...but I
RESET my
password!
Chris John Riley | 26.11.2013 | 112 Mobile Fail ::: Cracking open “secure” Android Containers
PROFIT ++
Chris John Riley | 26.11.2013 | 114 Mobile Fail ::: Cracking open “secure” Android Containers
GOOD for enterprise
Chris John Riley | 26.11.2013 | 115 Mobile Fail ::: Cracking open “secure” Android Containers
GOOD
• Enterprise email solution
• Email | Contacts | intranet Browser | …
• Secured with a PIN or password
• enterprise policy
• Wipes data/device after 10 false logons
https://www.good.com
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Adv. security features
• Double encryption
• SSL Tunnel + Encrypted contents
• Full MDM solution
• Password Policies
• …
• r00t detection
• emulator detection
• advanced detection
https://www.good.com
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Lost device (BYOD)
• Can an attacker prevent secure wipe
• Can an attacker access cached data
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PROBLEM
Chris John Riley | 26.11.2013 | 119 Mobile Fail ::: Cracking open “secure” Android Containers
unlike
LastPass
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preferences are
encrypted
Chris John Riley | 26.11.2013 | 121 Mobile Fail ::: Cracking open “secure” Android Containers
PROBLEM
Chris John Riley | 26.11.2013 | 122 Mobile Fail ::: Cracking open “secure” Android Containers
…after 10 false logons auto-wipe
Chris John Riley | 26.11.2013 | 124 Mobile Fail ::: Cracking open “secure” Android Containers
Disable PIN
Chris John Riley | 26.11.2013 | 125 Mobile Fail ::: Cracking open “secure” Android Containers
auto-wipe counter
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brute-force
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<application android:allowBackup=“true”>
AndroidManifest.xml
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THEORY
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Theory
• Auto-wipe counter
• Stored IN app data somewhere
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THEORY
Chris John Riley | 26.11.2013 | 133 Mobile Fail ::: Cracking open “secure” Android Containers
adb restore
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over write
auto-wipe
counter
Chris John Riley | 26.11.2013 | 135 Mobile Fail ::: Cracking open “secure” Android Containers
#fa
ce
palm
Chris John Riley | 26.11.2013 | 136 Mobile Fail ::: Cracking open “secure” Android Containers
brute-force
Chris John Riley | 26.11.2013 | 137 Mobile Fail ::: Cracking open “secure” Android Containers
Naïve Attack
• Backup app data
• until good.unlock?
• Try 9 PINS
• Restore app data
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PROBLEM
Chris John Riley | 26.11.2013 | 140 Mobile Fail ::: Cracking open “secure” Android Containers
Naïve Attack timing
* 18.75 ppm ~ 50% keyspace
• 4 digit PIN
• est. 4.5 hours*
• 6 digit PIN
• est. 18.5 days*
• 8 digit PIN
• est. 5 years*
Chris John Riley | 26.11.2013 | 141 Mobile Fail ::: Cracking open “secure” Android Containers
Naïve Attack timing
• 4 lower alphanum
• est. 31 days*
• 6 lower alphanum
• est. 3 years*
• 8 lower alphanum
• est. 110 years*
* 18.75 ppm ~ 50% keyspace
Chris John Riley | 26.11.2013 | 142 Mobile Fail ::: Cracking open “secure” Android Containers
Naïve Attack timing
• 4 mixed alphanum
• est. 1 year*
• 6 mixed alphanum
• est. 46.5 years*
• 8 mixed alphanum
• est. 2880 years*
* 18.75 ppm ~ 50% keyspace
Chris John Riley | 26.11.2013 | 144 Mobile Fail ::: Cracking open “secure” Android Containers
Device
CONTAINER
Chris John Riley | 26.11.2013 | 145 Mobile Fail ::: Cracking open “secure” Android Containers
Device
CONTAINER
Chris John Riley | 26.11.2013 | 146 Mobile Fail ::: Cracking open “secure” Android Containers
Device
CONTAINER
Chris John Riley | 26.11.2013 | 147 Mobile Fail ::: Cracking open “secure” Android Containers
#fa
ce
palm
#fa
ce
palm
Chris John Riley | 26.11.2013 | 151 Mobile Fail ::: Cracking open “secure” Android Containers
Adv. Attack
• Automate PIN + restore
• adb shell input text
• adb shell input keyevent
• adb shell input tap
Chris John Riley | 26.11.2013 | 152 Mobile Fail ::: Cracking open “secure” Android Containers
Minimize keyspace
• Password Rules
• No sequenced numbers (e.g. 4567)
• No duplicate numbers (e.g. 1111)
• Result
• Reduced keyspace
Chris John Riley | 26.11.2013 | 154 Mobile Fail ::: Cracking open “secure” Android Containers
PROFIT!
Chris John Riley | 26.11.2013 | 156 Mobile Fail ::: Cracking open “secure” Android Containers
Making it easy
Chris John Riley | 26.11.2013 | 157 Mobile Fail ::: Cracking open “secure” Android Containers
methodology
• Common methodology
• Backup (adb)
• Extract
• Examine
• Edit
• Repack
• Restore (adb)
← here be dragons
← bypass all the things
Chris John Riley | 26.11.2013 | 158 Mobile Fail ::: Cracking open “secure” Android Containers
remember this
process?
Chris John Riley | 26.11.2013 | 159 Mobile Fail ::: Cracking open “secure” Android Containers
0 - adb backup com.lastpass.lpandroid -f lpass.ab
1 - dd if=lpass.ab bs=24 skip=1 | openssl zlib -d > lpass.tar
2 - tar -tf lpass.tar > lpass.list
3 - tar -xvf lpass.tar
4 - edit apps/com.lastpass.lpandroid/sp/LPandroid.xml
5 - star -c -v -f lpass_new.tar -no-dirslash list=lpass.list apps/
6 - dd if=lpass.ab bs=24 count=1 of=lpass_new.ab
7 - openssl zlib -in lpass_new.tar >> lpass_new.ab
8 - adb restore lpass_new.ab
Chris John Riley | 26.11.2013 | 160 Mobile Fail ::: Cracking open “secure” Android Containers
Say that 10
times fast!
Chris John Riley | 26.11.2013 | 162 Mobile Fail ::: Cracking open “secure” Android Containers
automation
Chris John Riley | 26.11.2013 | 165 Mobile Fail ::: Cracking open “secure” Android Containers
ab_unpacker.py
https://github.com/ChrisJohnRiley/Random_Code
Chris John Riley | 26.11.2013 | 166 Mobile Fail ::: Cracking open “secure” Android Containers
ab_packer.py
https://github.com/ChrisJohnRiley/Random_Code
Chris John Riley | 26.11.2013 | 167 Mobile Fail ::: Cracking open “secure” Android Containers
Makes
0wning
things
Chris John Riley | 26.11.2013 | 168 Mobile Fail ::: Cracking open “secure” Android Containers
200 / quicker
1000 / funner
o o
o o
Chris John Riley | 26.11.2013 | 173 Mobile Fail ::: Cracking open “secure” Android Containers
RE VIEW
Chris John Riley | 26.11.2013 | 174 Mobile Fail ::: Cracking open “secure” Android Containers
“secure”containers
!= SECURE containers
Chris John Riley | 26.11.2013 | 175 Mobile Fail ::: Cracking open “secure” Android Containers
Physical
access
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Developers
Chris John Riley | 26.11.2013 | 181 Mobile Fail ::: Cracking open “secure” Android Containers
android.allowBackup
http://developer.android.com/guide/topics/data/backup.html
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Some devs
GET it!
Chris John Riley | 26.11.2013 | 184 Mobile Fail ::: Cracking open “secure” Android Containers
pref files
Chris John Riley | 26.11.2013 | 185 Mobile Fail ::: Cracking open “secure” Android Containers
Securing Apps
• Preference files are NOT secret
• Encrypt preference data
• ONLY store encrypted passwords
• No XOR / base64 please
• Don’t TRUST the config
• HMAC | Sign | Encrypt
Chris John Riley | 26.11.2013 | 186 Mobile Fail ::: Cracking open “secure” Android Containers
android
backup
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Securing Apps
• Disallow Android Backup
• if you don’t absolutely need it!
<application android:allowBackup=“false”>
Chris John Riley | 26.11.2013 | 188 Mobile Fail ::: Cracking open “secure” Android Containers
extra
security
Chris John Riley | 26.11.2013 | 189 Mobile Fail ::: Cracking open “secure” Android Containers
Extra Security
• USB Debugging
• Disable app when activated
• Root makes these hack easier still
• edit/read preference files on device itself
• ROOT detection is too basic
• easy to fool
Chris John Riley | 26.11.2013 | 190 Mobile Fail ::: Cracking open “secure” Android Containers
users e
nd
Chris John Riley | 26.11.2013 | 191 Mobile Fail ::: Cracking open “secure” Android Containers
Users
• Encrypt your device
• Encrypts ADB backups
• Need to enter same passcode on backup screen
• Disable USB Debugging
• protects against adb pull/push attacks
• Don’t loose your phone ;)
Chris John Riley | 26.11.2013 | 195 Mobile Fail ::: Cracking open “secure” Android Containers
Question time
Chris John Riley | 26.11.2013 | 197 Mobile Fail ::: Cracking open “secure” Android Containers
Thank you for your attention!
Vielen Dank für Ihre Aufmerksamkeit!
Raiffeisen Informatik GmbH
Lilienbrunngasse 7-9
A-1020 Wien
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