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Android Vulnerabilities

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  • Question - Have you ever thought of how security is implemented in OS? 2 levels Describe figure and MAC model

Transcript

  • 1. Vulnerability Study  of the Android Ryan Selley, Swapnil Shinde, Michael Tanner, Madhura Tipnis, Colin Vinson (Group 8)
  • 2.  
  • 3. Overview
      • Architecture of the Android
      • Scope of Vulnerabilities for the Android
      • Known Vulnerabilities for the Android
      • General Vulnerabilities of Mobile Devices
      • Organizations Supporting the Android
  • 4. Architecture
      • It is a software stack which performs several OS functions.
    •  
      • The Linux kernel is the base of the software stack.  
    •  
      •   Core Java libraries are on the same level as other libraries.
    •  
      •   The virtual machine called the Dalvik Virtual Machine is on this layer as well.
      • The application framework is the next level.
    •  
  • 5.  
  • 6. Parts of Applications
      • Activity An activity is needed to create a screen for a user application.  
    •  
      • Intents Intents are used to transfer control from one activity to another.
    •  
      • Services It doesn't need a user interface. It continues running in the background with other processes run in the foreground.
  • 7.  
      • Content Provider This component allows the application to share information with other applications.
  • 8. Security Architecture - Overview
  • 9. Scope of Vulnerabilities
    • Refinements to MAC Model
      • Delegation
      • Public and Private Components
      • Provision - No Security Access to Public Elements
      • Permission Granting Using User's Confirmation
    •     Solutions ???
    •            Precautions by Developers
    •   Special Tools for Users
  • 10. Known Vulnerabilities
      • Image Vulnerablities
        • GIF
        • PNG
        • BMP
      • Web Browser
  • 11. GIF Image Vulnerability
      • Decode function uses logical screen width and height to allocate heap
      • Data is calculated using actual screen width and height
      • Can overflow the heap buffer allowing hacker can allow a hacker to control the phone
  • 12. PNG Image Vulnerability
      • Uses an old libpng file
      • This file can allow hackers to cause a Denial of Service (crash)
  • 13. BMP Image Vulnerability
      • Negative offset integer overflow
      • Offset field in the image header used to allocate a palette
      • With a negative value carefully chosen you can overwrite the address of a process redirecting flow
  • 14. Web Browser Vulnerability
      • Vulnerability is in the multimedia subsystem made by PacketVideo
      • Due to insufficient boundary checking when playing back an MP3 file, it is possible to corrupt the process's heap and execute arbitrary code on the device
      • Can allow a hacker to see data saved on the phone by the web browser and to peek at ongoing traffic
      • Confined to the "sandbox"
  • 15. General Mobile Phone Vulnerabilities
      • GSM
        • SMS
        • MMS
      • CDMA
      • Bluetooth
      • Wireless vulnerabilities
  • 16. GSM Vulnerabilities
      • GSM
        • Largest Mobile network in the world
        • 3.8 billion phones on network
      • David Hulton and Steve Muller
        • Developed method to quickly crack GSM encryption
        • Can crack encryption in under 30 seconds
        • Allows for undetectable evesdropping
      • Similar exploits available for CDMA phones
  • 17. SMS Vulnerabilities
      • SMS
        • Short Messaging System
        • Very commonly used protocol
        • Used to send "Text Messages"
      • GSM uses 2 signal bands, 1 for "control", the other for "data".
      • SMS operates entirely on the "control" band.
      • High volume text messaging can disable the "control" band, which also disables voice calls.
      • Can render entire city 911 services unresponsive.
  • 18. MMS Vulnerabilities
      • MMS
        • Unsecure data protocol for GSM
        • Extends SMS, allows for WAP connectivity
      • Exploit of MMS can drain battery 22x faster
        • Multiple UDP requests are sent concurrently, draining the battery as it responds to request
      • Does not expose data
      • Does make phone useless
  • 19. Bluetooth Vulnerabilities
      • Bluetooth
        • Short range wireless communication protocol
        • Used in many personal electronic devices
        • Requires no authentication
      • An attack, if close enough, could take over Bluetooth device.
      • Attack would have access to all data on the Bluetooth enabled device
      • Practice known as bluesnarfing
  • 20. Organizations Supporting Android
      • Google
      • Open Handset Alliance
      • 3rd Parties (ex: Mocana)
      • Users
      • Hackers
  • 21. Organizations Supporting Android
    •  
  • 22. Open Handset Alliance
    •  
  • 23. Open Handset Alliance
    • Objective:
    •  
    •        To build a better mobile phone to enrich
    •        the lives of countless people across the globe.
  • 24. 3rd Party Partners
    • Mocana -- NanoPhone
      • Secure Web Browser
      • VPN
      • FIPS Encryption
      • Virus & Malware Protection
      • Secure Firmware Updating
      • Robust Certificate Authentication
    •  
    •  
    •  
  • 25. Hackers for Android
      • Hackers make Android stronger
      • White hats want to plug holes
      • Example
        • Browser Threat reported by Independent Security Evaluators
        • Jailbreak hole fixed by Google over-the-air
    •  
    •  
    •  
  • 26. Conclusion
      • Android is New & Evolving
      • Openness of Android
        • Good in the long-run
        • Strong Community
      • Robust Architecture
      • Powerful Computing Platform
    •  
    •  
    •