UEFI Variable Access Locking for Secure Heterogeneous Platforms
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Solution Overview
Problem
Existing systems fail to securely manage access to Unified Extensible Firmware Interface (UEFI) variables stored in Non-Volatile Random-Access Memory (NVRAM), particularly in heterogeneous computing platforms where multiple operating systems and virtual machines may attempt to access and modify these variables, posing a significant security risk.
Innovation Solution
Implementing a system where access to UEFI variables in NVRAM is restricted to authorized applications, with cryptographic challenges and responses based on associated cryptographic keys, ensuring only authorized applications can access and modify these variables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access to UEFI variables in NVRAM is allowed for multiple operating systems and virtual machines, then system versatility and functionality are improved, but security risks increase due to unauthorized access and modification
Solution Approach 1:
The patent segments access permissions by creating distinct authorization levels for different applications. The host operating system is granted full access to all UEFI variables, while the service operating system is restricted to only those variables necessary for its specific functions. This segmentation allows multiple OSes to coexist with differentiated access rights, maintaining versatility while ensuring security through controlled permission boundaries.
2Reliability
If access control restrictions are implemented for UEFI variables, then security is improved, but system complexity increases due to authentication mechanisms
Solution Approach 1:
The patent implements preliminary action by establishing cryptographic authentication credentials before the service operating system attempts to access UEFI variables. The host OS provides cryptographic challenges to the service OS during the boot process, and the service OS must present valid cryptographic responses based on pre-configured keys. This preliminary authentication mechanism ensures security is verified in advance, allowing the system to maintain complex security requirements while streamlining the actual access control execution.
Data Source
AI summary
Systems and methods include an Information Handling System (IHS) that is adapted to protect access to configurable settings of the IHS. Upon the IHS being powered, a UEFI boot sequence is initiated. During the boot sequence, a boot sequence notification is detected that indicates conditions required for booting an operating system of the IHS have been met. Further access to the NVRAM that stores UEFI variables is locked such that upon receiving a request for access to a UEFI variable stored in the NVRAM, the request for access to a UEFI variable is granted based on a listing of authorized applications.