Separation Kernel Hypervisor Anti-Fingerprinting
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Solution Overview
Problem
Existing hypervisor systems face limitations in detecting and defending against malicious code, as they can be subverted and fail to prevent the proliferation of malicious code between guest operating systems, and are inadequate in handling fingerprinting and probing attacks.
Innovation Solution
A Separation Kernel Hypervisor is introduced, which provides secure and isolated mechanisms to monitor and defeat malicious code by utilizing Guest Operating System Virtual Machine Protection Domains and Virtualization Assistance Layers, ensuring that monitoring agents remain incorruptible and proximate to malicious code, while varying the virtualized hardware environment to prevent fingerprinting attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional hypervisor is used to support multiple guest operating systems, then the system can provide virtualization and resource sharing, but the hypervisor can be subverted by malicious code and cannot effectively defend itself
Solution Approach 1:
The system segments the hypervisor functionality into two distinct components: a traditional hypervisor that handles virtualization and resource management, and a separate separation kernel that provides security monitoring and malicious code detection. This segmentation allows each component to specialize in its function while the separation kernel independently verifies the integrity of the hypervisor, preventing subversion without compromising virtualization capabilities.
2Difficulty of detecting and measuring
If monitoring agents are placed within the same guest operating system as malicious code, then they can detect malicious activity, but the monitoring agents can be corrupted or subverted by the malicious code
Solution Approach 1:
The separation kernel acts as an intermediary between the hypervisor and guest operating systems. It runs in a protected environment with direct access to hardware resources and can monitor guest activities without being exposed to malicious code. The separation kernel verifies the integrity of monitoring agents and can detect malicious behavior that attempts to corrupt them, ensuring continuous reliable monitoring.
3Productivity
If the virtualized hardware environment is made static and predictable, then guest operating systems can run efficiently, but fingerprinting techniques can easily identify the virtualized environment
Solution Approach 1:
The separation kernel dynamically modifies hardware environment presentations to guest operating systems based on security requirements. It can alter device identifiers, memory layouts, and other hardware characteristics to prevent fingerprinting, while maintaining the functional behavior needed for guest OS operation. This dynamic adaptation allows the system to balance performance with security against detection.
4Reliability
If a separation kernel hypervisor is implemented with strict isolation mechanisms, then security and isolation are enhanced, but system complexity increases
Solution Approach 1:
The separation kernel extracts security-critical functions from the traditional hypervisor architecture. By removing malicious code detection and integrity verification responsibilities from the main hypervisor, the remaining hypervisor can focus on performance-optimized virtualization tasks. The separation kernel handles security isolation in a dedicated, simplified manner, reducing overall system complexity while enhancing security capabilities.
Data Source
AI summary
Systems, methods, computer readable media and articles of manufacture consistent with innovations herein are directed to computer virtualization, computer security and/or hypervisor fingerprinting. According to some illustrative implementations, innovations herein may utilize and/or involve a separation kernel hypervisor which may include the use of a guest operating system virtual machine protection domain, a virtualization assistance layer, and/or a CPU ID instruction handler (which may be proximate in temporal and/or spatial locality to malicious code, but isolated from it). The CPU ID instruction handler may perform processing, inter alia, to return configurable values different from the actual values for the physical hardware. The virtualization assistance layer may further contain virtual devices, which when probed by guest operating system code, return the same values as their physical counterparts. In addition, the virtualization assistance layer may vary its internal I/O and memory addresses in a configurable manner.