This talk will be focused on how to develop secure mobile apps. We will look into specifics regarding mobile development and what are the best practices. We will make an emphasis on all issues affecting the mobile platform such as protocols, secure storage, secrets, caching, logging, etc.

1. Building Secure Mobile Apps
Sergey Gorbaty
Senior Product Security Engineer
@ser_gor
Martin Vigo
Associate Product Security Engineer
@martin_vigo

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3. Martin Vigo
Product Security Engineer

4. Sergey Gorbaty
Senior Product Security Engineer

5. Outline
• Attacks on Mobile Apps
• Developing Secure Mobile Apps
• What Frameworks Help You With

6. Attacks on Mobile Apps

7. Mobile App Threats
• Native Mobile App Threats
– File system, DB Storage, Logs
– Network Communication
– Clipboard
– Backups
– RPC, URL scheme handlers
• Web App Threats
– Input validation
• Session management
• Web app logic flaws
– Web vulnerabilities
• XSS, CSRF
• Injections
– SQL, header

8. Native App Threats
• File system
– Excessive Logging
– Storing credentials and sensitive data unencrypted
– Hardcoded secrets
– Cached data
• Network Communication
– Not using TLS/SSL
– Using self-signed SSL in QA and not disabling in production
– Not using proper session management
• Clipboard
– Any app can read all messages
• Backups
– Sensitive data can be backed up to PC/Cloud

9. Web App Threats
• Application logic flaws
– Skipping through Activities in Android applications
– Malicious Intents launched from attacker’s website
• Web security
– Input validation
• Accept any input
– Output Encoding
• Make sure the tainted data is sanitized
• XSS
• Header injections
– Protecting sensitive actions
• CSRF

10. Outline
• Attacks on Mobile Apps
• Developing Secure Mobile Apps
• What Frameworks Help You With

11. Developing Secure Mobile Apps
• iOS/OS X ‘Secure Coding Guide’
– Comprehensive, 120 pages long
– Covers topics from buffer overflows to web vulnerabilities
– https://developer.apple.com/library/iOs/documentation/Security/Conceptual/SecureCodingGuide/S
ecureCodingGuide.pdf
• Android.com ‘Security Tips’
– 6 articles on
• Storing data
• Using permissions
• Using networking
• Using RPC
• Webview security
– http://developer.android.com/training/articles/security-tips.html

12. Outline
• Attacks on Mobile Apps
• Developing Secure Mobile Apps
• What Frameworks Help You With

13. Mobile Frameworks
The breakdown
• All focus on rapid development using HTML
• Most provide easy ways of creating secure TLS connections
• Fair amount provide authentication support
• Few provide secure credential storage
• Very few provide secure data storage

14. Protecting Data
Salesforce Mobile SDK - github.com/forcedotcom
• Uses proper peer reviewed crypto with random IV, cipher mode and padding
• Secrets are properly stored
– Keychain
– AccountManager
• PIN code support for added security
• TLS
• Cordova plugins are properly scoped
• Limited amount of logging

15. Demo
Looking at files inside Apple Sandbox - iExplorer

16. Hybrid Apps
• Can access device internals through plugins
– Camera, photos
– Accelerometer, GPS, Compass, Gyroscope
– Keychain
– SD card
– Etc.

17. Demo
XSS with BEEF on Hybrid mobile app

18. Protecting Mobile Apps
What to focus on
• Follow best development practices
– Brush up on OWASP top 10 mobile threats
– Review official vendor recommendations
– Follow recommendations for storing secrets and data
– Exercise minimal logging
– Using TLS
– Use security frameworks, don’t roll your own crypto
• Use free security assessment tools
– HTTP traffic examination: Burp Suite, Fiddler, Charles Proxy
– App sandbox examination: iExplorer, drozer, Android debugging bridge
– Source code review: Findbugs, Brakeman, Scanjs