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F2A: An Innovative Approach for Prompt Injection by Utilizing Feign Security Detection Agents

With the rapid development of Large Language Models (LLMs), numerous mature applications of LLMs have emerged in the field of content safety detection. However, we have found that LLMs exhibit blind trust in safety detection agents. The general LLMs can be compromised by hackers with this vulnerability. Hence, this paper proposed an attack named Feign Agent Attack (F2A).Through such malicious forgery methods, adding fake safety detection results into the prompt, the defense mechanism of LLMs can be bypassed, thereby obtaining harmful content and hijacking the normal conversation. Continually, a series of experiments were conducted. In these experiments, the hijacking capability of F2A on LLMs was analyzed and demonstrated, exploring the fundamental reasons why LLMs blindly trust safety detection results. The experiments involved various scenarios where fake safety detection results were injected into prompts, and the responses were closely monitored to understand the extent of the vulnerability. Also, this paper provided a reasonable solution to this attack, emphasizing that it is important for LLMs to critically evaluate the results of augmented agents to prevent the generating harmful content. By doing so, the reliability and security can be significantly improved, protecting the LLMs from F2A.

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