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Sok: Comprehensive Security Overview, Challenges, and Future Directions of Voice-Controlled Systems

Haozhe Xu, Cong Wu, Yangyang Gu, Xingcan Shang, Jing Chen, Kun He, Ruiying Du

TL;DR

Voice-control systems integrate into everyday devices, raising privacy and security concerns due to diverse attack vectors. The paper proposes a four-layer hierarchical model (physical, preprocessing, kernel, service) to systematically categorize attacks (transduction, voice-synthesis, adversarial, spoofing, squatting, faking termination) and defenses, and it analyzes threat models, metrics, and attacker goals across layers. It then synthesizes layer-specific defense schemes and a generalized attack-mitigation framework (including liveness detection and audio conversion) to guide robust VCS design. The work highlights practical recommendations, device-specific hardware considerations, and future directions such as black-box attack realism and unified evaluation standards to advance secure VCS deployment.

Abstract

The integration of Voice Control Systems (VCS) into smart devices and their growing presence in daily life accentuate the importance of their security. Current research has uncovered numerous vulnerabilities in VCS, presenting significant risks to user privacy and security. However, a cohesive and systematic examination of these vulnerabilities and the corresponding solutions is still absent. This lack of comprehensive analysis presents a challenge for VCS designers in fully understanding and mitigating the security issues within these systems. Addressing this gap, our study introduces a hierarchical model structure for VCS, providing a novel lens for categorizing and analyzing existing literature in a systematic manner. We classify attacks based on their technical principles and thoroughly evaluate various attributes, such as their methods, targets, vectors, and behaviors. Furthermore, we consolidate and assess the defense mechanisms proposed in current research, offering actionable recommendations for enhancing VCS security. Our work makes a significant contribution by simplifying the complexity inherent in VCS security, aiding designers in effectively identifying and countering potential threats, and setting a foundation for future advancements in VCS security research.

Sok: Comprehensive Security Overview, Challenges, and Future Directions of Voice-Controlled Systems

TL;DR

Voice-control systems integrate into everyday devices, raising privacy and security concerns due to diverse attack vectors. The paper proposes a four-layer hierarchical model (physical, preprocessing, kernel, service) to systematically categorize attacks (transduction, voice-synthesis, adversarial, spoofing, squatting, faking termination) and defenses, and it analyzes threat models, metrics, and attacker goals across layers. It then synthesizes layer-specific defense schemes and a generalized attack-mitigation framework (including liveness detection and audio conversion) to guide robust VCS design. The work highlights practical recommendations, device-specific hardware considerations, and future directions such as black-box attack realism and unified evaluation standards to advance secure VCS deployment.

Abstract

The integration of Voice Control Systems (VCS) into smart devices and their growing presence in daily life accentuate the importance of their security. Current research has uncovered numerous vulnerabilities in VCS, presenting significant risks to user privacy and security. However, a cohesive and systematic examination of these vulnerabilities and the corresponding solutions is still absent. This lack of comprehensive analysis presents a challenge for VCS designers in fully understanding and mitigating the security issues within these systems. Addressing this gap, our study introduces a hierarchical model structure for VCS, providing a novel lens for categorizing and analyzing existing literature in a systematic manner. We classify attacks based on their technical principles and thoroughly evaluate various attributes, such as their methods, targets, vectors, and behaviors. Furthermore, we consolidate and assess the defense mechanisms proposed in current research, offering actionable recommendations for enhancing VCS security. Our work makes a significant contribution by simplifying the complexity inherent in VCS security, aiding designers in effectively identifying and countering potential threats, and setting a foundation for future advancements in VCS security research.
Paper Structure (46 sections, 1 equation, 2 figures, 5 tables)

This paper contains 46 sections, 1 equation, 2 figures, 5 tables.

Table of Contents

  1. Introduction
  2. Background
  3. System Overview of VCS
  4. Physical Layer
  5. Preprocessing Layer
  6. Kernel Layer
  7. Service Layer
  8. Attacks against VCS
  9. Threat Model
  10. Attack Metrics
  11. Attacker Goal
  12. Defense Schemes in VCS
  13. Layer-Based Systematization of Attacks and Defenses in VCS
  14. Physical Layer
  15. Transduction Attacks in Physical Layer
  16. ...and 31 more sections

Figures (2)

  • Figure 1: An Illustrative Overview of Structure of Our Survey Article.
  • Figure 2: A hierarchical Workflow Diagram of VCS. After a user issues a voice command to the VCS, the user will receive a response from the VCS. Based on the response, the user can choose to issue another relevant command to the VCS.