TEE / TrustZone Analysis
Security review of ARM TrustZone, Intel TXT, and secure enclave implementations including HSM integration and trusted application isolation.
TEE / TrustZone Analysis
Trusted Execution Environments (TEEs) are hardware-isolated secure enclaves that protect cryptographic keys, biometric data, digital rights management material, and other sensitive assets from compromise even when the main operating system is fully controlled by an attacker. ARM TrustZone, Intel TXT, and platform-specific TEE implementations (Qualcomm QSEE, Samsung Knox) underpin the security of billions of mobile and embedded devices.
Intelliroot's TEE/TrustZone Analysis service assesses the security of TEE implementations, Trusted Applications (TAs), and the Secure Monitor Call (SMC) interface between the normal world and secure world. Our specialists have experience analysing OP-TEE, Qualcomm QSEE, and vendor-specific TEE implementations across ARM Cortex-A and Cortex-M platforms.
TEE Vulnerabilities Undermine Platform Trust
TEE Compromise Yields Cryptographic Keys
A successful TEE compromise gives an attacker access to the most sensitive assets on the platform — device attestation keys, biometric templates, payment credentials, and DRM keys. These assets are irreplaceable on deployed hardware and their compromise may require device replacement rather than a software patch.
SMC Interfaces Are Complex Attack Surfaces
The Secure Monitor Call interface is a rich attack surface. Each SMC handler must correctly validate all parameters, enforce privilege separation, and handle error conditions without leaking information or creating exploitable conditions in the secure world.
Trusted Applications Often Contain Bugs
Trusted Applications are written by device OEMs and application developers who may lack TEE security expertise. Memory corruption bugs, integer overflows, and input validation failures in TAs can be exploited from the normal world to gain secure world code execution.
TEE Bypasses Affect Entire Device Fleets
A TEE vulnerability disclosed by researchers for one device model frequently affects the same TEE implementation across multiple OEM devices sharing the same SoC. The blast radius of a single TA vulnerability can extend to tens of millions of deployed devices.
What We Assess
TEE Implementation Review
Assessment of the TEE OS (OP-TEE, QSEE, Knox) configuration, secure world memory layout, and normal world / secure world isolation mechanisms.
Trusted Application Analysis
Reverse engineering and security review of Trusted Applications. Identification of memory corruption, input validation failures, and privilege escalation vulnerabilities.
SMC Interface Fuzzing
Automated fuzzing of the Secure Monitor Call interface from the normal world. Identification of integer overflows, type confusion, and memory safety issues in SMC handlers.
Cryptographic Key Protection
Assessment of key derivation, storage, and usage within the TEE. Evaluation of hardware-bound key protection and attestation mechanisms.
Our Approach
- 01
TEE Architecture Mapping
Identify TEE implementation (OP-TEE, QSEE, Knox, vendor-specific). Map normal world / secure world boundary, SMC interface, and deployed Trusted Applications.
- 02
TA Extraction & Reverse Engineering
Extract Trusted Application binaries. Reverse engineer using Ghidra/IDA with TEE-specific plugins. Map TA functionality, input handling, and cryptographic operations.
- 03
SMC Interface Fuzzing
Develop and execute fuzzing harnesses for the SMC interface. Monitor secure world for crashes, unexpected state transitions, and information leakage.
- 04
Vulnerability Exploitation
Develop proof-of-concept exploits for confirmed vulnerabilities to demonstrate impact and validate severity ratings.
- 05
Reporting & Disclosure Support
Detailed technical report with findings and CVE-quality vulnerability descriptions. Support for coordinated disclosure with TEE vendors where applicable.
Deliverables
TEE Security Assessment Report
Technical report covering TEE configuration, Trusted Application vulnerabilities, SMC interface findings, and exploitation proof-of-concepts.
Trusted Application Inventory
Complete inventory of deployed TAs with security assessment of each, including input validation, privilege separation, and cryptographic key handling.
SMC Fuzzing Results
Fuzzing coverage report including crash logs, identified crash conditions, and recommendations for SMC handler hardening.
Remediation Guidance
Specific remediation guidance for each finding, including TA code fixes, TEE configuration hardening, and disclosure coordination support where relevant.
Request a Security Assessment
Tell us about your environment and security objectives. We'll design a bespoke assessment and deliver a detailed proposal within 48 hours.