How can I secure LLM agent prompts against privilege escalation?
Prompt Flow Integrity to Prevent Privilege Escalation in LLM Agents
This paper introduces Prompt Flow Integrity (PFI), a security framework for LLM agents designed to prevent privilege escalation attacks. PFI identifies and isolates untrusted data, enforces least privilege by using separate agents for trusted and untrusted data, and validates data flow to prevent unintended actions. Key points for LLM-based multi-agent systems include: untrusted data from plugins poses a significant risk; current LLM agents often lack the principle of least privilege, making them vulnerable; data flow validation is crucial but challenging due to the probabilistic nature of LLMs; and PFI's approach of isolating untrusted data and validating data flow offers a more deterministic security guarantee.