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Installing Fake Root Keys in a PC

Installing Fake Root Keys in a PC. Adil Alsaid and Chris J. Mitchell Information Security Group Royal Holloway, University of London. Contents. Introduction Installing Root Certificates A Practical Method for Silently Installing a Root Certificate Countermeasures. Introduction.

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Installing Fake Root Keys in a PC

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  1. Installing Fake Root Keys in a PC Adil Alsaid and Chris J. Mitchell Information Security Group Royal Holloway, University of London

  2. Contents • Introduction • Installing Root Certificates • A Practical Method for Silently Installing a Root Certificate • Countermeasures

  3. Introduction • The attack • Motivation

  4. Installing Root Certificates • Creating a Root Certificate • Installing Root Certificates under user control

  5. Creating a Root Certificate makecert -r -n "CN=MyRootCA, OU=MyOrganization, O=CompanyName,E=Emailaddress" -sv root.pvk root.cer

  6. User Controlled Installation

  7. User Controlled Installation

  8. User Controlled Installation

  9. General Approach to Silent Root Certificate Installation • Using standard tools • Writing directly to the root certificate store

  10. A Practical Method for Silently Installing a Root Certificate • C++ and CryptoAPI • MS Windows message system

  11. The Attack • The user executes a malicious applet • The malicious applet does the following: • Creates another running thread (Monitoring) • Makes a CryptoAPI function call to add the fake root certificates • Hides the ‘security warning’ message box by providing a positive answer • Now, the fake root certificate will be listed in the browser’s trusted root CAs list

  12. Countermeasures • Proactive or preventative measures • Users re-authentication • Root public key store access restriction • Reactive measures • Scanning tool • OCSP • Verified and user added root keys

  13. Questions?

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