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Passwords on a
Phone
Silicon Valley Code Camp
Oct 8, 2017
Me
• Sam Bowne
• Twitter: @sambowne
• Instructor at City College San Francisco
• All materials freely available at samsclass.info
Persistent Login
•Users remain logged in even after shutting off
their phone
•How does the app remember who you are?
Target == GOOD
Target AU Android App
User Login
Server Response
Random Number, stored in a cookie
THIS IS THE RIGHT WAY
Staples == BAD
Tested in Jan 2017
Locally Stored Password
• Right away this shows a problem
• WHY store the password?
<string name="encryptedPassword">
CT9SVzhhRaufBzCvmwENWQ==
</string>
1. Best way: Don't. Use a cookie
2. Use Android KeyChain
3. Encrypt with with a public key
• Private key is kept secret on a server
4. Encrypt with with a private key
• Private key is "hidden" on the phone (under the mat)
5. Store data unencrypted on the phone
Special Password
• aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaA123
• 32 identical characters at beginning
<string name="encryptedPassword">
5V/uOkjK/Pxnb8yo7OdXzuVf7jpIyvz8Z2/
MqOznV84Chyt5lFv9LDpXXmJq9fUx
</string>
Decode
p = '5V/uOkjK/Pxnb8yo7OdXzuVf7jpIyvz8Z2/
MqOznV84Chyt5lFv9LDpXXmJq9fUx'
>>> p.decode("base64").encode("hex")
'e55fee3a48cafcfc676fcca8ece757cee55fee3a4
8cafcfc676fcca8ece757ce02872b79945bfd2c3a5
75e626af5f531'
e55fee3a48cafcfc676fcca8ece757ce
e55fee3a48cafcfc676fcca8ece757ce
02872b79945bfd2c3a575e626af5f531
Read Smali Code
Constructing the Key
Final Key
Encryption
Test
Notification
• Notified Jan 2, 2017
• Automated response said it would be fixed
• No response to follow-up email
• April 13 -- Staples became homework
Notification
• Fixed by May 9, 2017
Plaintext Password Storage
Plaintext Login
Broken SSL
A Feature, Not a Bug
Password Stored with
Reversible Encryption
Home Depot
Locally stored password is encrypted
Unpack APK
Salt -> Key
Complete Decryption
Kroger
Kroger
Safeway
Safeway
Walgreens
Walgreens
Multiple Vulnerabilities
Fixed
SSLstrip
sslstrip Proxy Changes HTTPS to HTTP
Target

Using

Facebook
Attacker: 

sslstrip Proxy

in the 

Middle
To
Internet
HTTP
HTTPS
Sslstrip Vulnerability
• If you go directly to an HTTPS URL, you are
not vulnerable
• But many sites use a 302 redirect from
HTTP to HTTPS, rendering them vulnerable
Dork for sslstrip Vulnerability
HTTP 301 Redirect
Stealing Password
Passwords On A Phone - Code Camp
Passwords On A Phone - Code Camp
Passwords On A Phone - Code Camp
Passwords On A Phone - Code Camp
Passwords On A Phone - Code Camp

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Passwords On A Phone - Code Camp