arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2603.03633cs.CRcs.AI
收藏

面向目标的风险评估用于LLM驱动系统:一个医疗案例研究

Goal-Driven Risk Assessment for LLM-Powered Systems: A Healthcare Case Study

School of Informatics, Computing, and Cyber Systems(信息学、计算与网络系统学院);Northern Arizona University(北亚利桑那大学);Department of Software Science(软件科学系);Tallinn University of Technology(塔林技术大学)

Neha Nagaraja, Hayretdin Bahsi

AI总结:

本文提出了一种面向目标的风险评估方法,用于评估LLM驱动系统的安全风险,通过攻击树详细分析威胁向量和攻击路径,以提升医疗系统等复杂系统的安全性。

摘要:

尽管将LLM整合到系统中在关键应用领域如医疗保健中带来了显著的好处,但新的安全挑战也随之出现,因为潜在的网络杀伤链循环结合了对抗性模型、提示注入和传统网络攻击。威胁建模方法使系统设计人员能够在开发的早期阶段识别潜在的网络威胁及相关缓解措施。尽管网络安全社区在将这些方法应用于软件系统方面有丰富的经验,但提取出的威胁通常是抽象和模糊的,限制了它们在复杂系统中进行适当可能性和影响评估以进行风险优先级排序的有效性,尤其是当系统涉及新的攻击表面时,如涉及LLM的系统。在本研究中,我们提出了一种结构化、以目标驱动的风险评估方法,通过使用攻击树将威胁与详细的攻击向量、前提条件和攻击路径相结合。我们通过一个基于LLM代理的医疗系统案例研究展示了所提出的方法。本研究将最新的LLM攻击与传统攻击相结合,并展示了适用于类似系统的可能攻击路径。通过提供结构化风险评估,本研究对文献做出了重要贡献,并推动了LLM驱动系统中的安全设计实践。

英文摘要:

While incorporating LLMs into systems offers significant benefits in critical application areas such as healthcare, new security challenges emerge due to the potential cyber kill chain cycles that combine adversarial model, prompt injection and conventional cyber attacks. Threat modeling methods enable the system designers to identify potential cyber threats and the relevant mitigations during the early stages of development. Although the cyber security community has extensive experience in applying these methods to software-based systems, the elicited threats are usually abstract and vague, limiting their effectiveness for conducting proper likelihood and impact assessments for risk prioritization, especially in complex systems with novel attacks surfaces, such as those involving LLMs. In this study, we propose a structured, goal driven risk assessment approach that contextualizes the threats with detailed attack vectors, preconditions, and attack paths through the use of attack trees. We demonstrate the proposed approach on a case study with an LLM agent-based healthcare system. This study harmonizes the state-of-the-art attacks to LLMs with conventional ones and presents possible attack paths applicable to similar systems. By providing a structured risk assessment, this study makes a significant contribution to the literature and advances the secure-by-design practices in LLM-based systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑