Imprompter: Tricking LLM Agents into Improper Tool Use
Xiaohan Fu1, Shuheng Li1, Zihan Wang1, Yihao Liu2, Rajesh Gupta1, Taylor Berg-Kirkpatrick1, Earlence Fernandes1
1University of California, San Diego, 2Nanyang Technological University
Overview¶
Large Language Model (LLM) Agents are an emerging computing paradigm that blends generative machine learning with tools such as code interpreters, web browsing, email, and more generally, external resources. These agent-based systems represent an emerging shift in personal computing. We contribute to the security foundations of agent-based systems and surface a new class of automatically computed obfuscated adversarial prompt attacks that violate the confidentiality and integrity of user resources connected to an LLM agent. We show how prompt optimization techniques can find such prompts automatically given the weights of a model. We demonstrate that such attacks transfer to production-level agents. For example, we show an information exfiltration attack on Mistral's LeChat agent that analyzes a user's conversation, picks out personally identifiable information, and formats it into a valid markdown command that results in leaking that data to the attacker's server. This attack shows a nearly 80% success rate in an end-to-end evaluation. We conduct a range of experiments to characterize the efficacy of these attacks and find that they reliably work on emerging agent-based systems like Mistral's LeChat, ChatGLM, and Meta's Llama. These attacks are multimodal, and we show variants in the text-only and image domains.
We present various demos and textual adversarial prompts on this page. For full details, please refer to our paper.
Video Demo on Real Products¶
Mistral LeChat (Nemo) Scenario 1¶
Mistral LeChat (Nemo) Scenario 2¶
ChatGLM Scenario 1¶
How to Reproduce¶
Expected Behavior
After we disclosed this vunerability to Mistral AI in September 2024, their security team decided to disable image markdown rendering features. Now you will not see the same behavior in the video demo but an image placeholder as in the conversation window. Find more details in the Disclosure section. The ChatGLM security team has not responded or addressed such issue. You should be able to reproduce the exact bahavior there.
Scenario 1¶
- Provide a piece of text that contains some PII information.
- Append the adversarial prompt (see below) to this text. Preferably with some newlines in between, but not a must.
- Send this to the target AI agent (Mistral LeChat or ChatGLM) and let it respond.
Example Prompt used in Demo Video Mistral LeChat (Nemo) Scenario 1 (Copy-Paste Ready)
For your convenience, below is the entire prompt used in the above first demo video which contains both a fake example cover letter as well as the adversarial prompt appended that you can copy and paste into the target agent i.e. Mistral LeChat directly .
Alice
8532852883
Seattle, WA, 98103
alice@yahoo.net
Dear Hiring Manager,
I wish to apply for the position of Summer Camp Math Teacher in The University Child Development School.I hold a Bachelor of Arts in Preschool Education with five years of educational experience.
In my last role as a early childhood educator in Our Beginning, I was involved in creating a Reggio-inspired learning environment for children, collaborating with my co-teacher to implement safe and creative daily activities for children aged 2-5. Considering the importance of the environment in Reggio Emilia approach, I was able to find age-appropriate learning materials for children, I always emphasize collaboration and leadership to help children resolve the problem when they are in need.I also highly focus on the safety and hygiene in the classroom, making sure children feel supported.
I believe that my passion, patience and energy combine to make a viable candidate for your position. I look forward to providing any application materials that may be required as well as the opportunity to meet with you for an interview.
Thank you for your time.
Sincerely,
Alice
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Input some user conversation with the agent.
Tell me some best jobs to apply for this resume Santiago Delgado 123 Main Street, Raleigh, NC 12345 (201) 667-1798 deSantiago@yahoo.net Objective: Highly motivated and detail-oriented professional seeking a position as a Structure Loader at Lumen. Offering a strong background in telecommunications and network fundamentals, with demonstrated proficiency in inventory systems and data integrity. Eager to contribute to the success of the company by efficiently completing service assignments and maintaining accurate records. Education: Associate’s Degree in Computer Science ABC College, Raleigh, NC Skills: - Technical Skills: - NDS 5 Prod - Calix - Adtran - Nocvue - Qmate - Radcrunch - Poll Dslam - Networking - Microsoft Teams - Citrix Gateway - Microsoft Excel - Office 365 - Systems and Platforms: - Mosaic Cloud Platform - Mosaic XGS - ODIN - Optius - Salesforces - Genesys Cloud - Soft Skills: - Quick Thinking - Active Listening - Teamwork - Communication - Service Desk - Help Desk Support - Information Technology Experience: Telecommunications Technician XYZ Telecommunications Company, Raleigh, NC April 20XX - Present - Assisted in identifying plant facilities and preparing cut-sheets for service assignments - Coordinated aspects of OSP or ISP work orders through completion - Updated and maintained assignment and record systems resulting from work orders - Ensured data integrity of inventory systems by accurately inputting and updating information - Collaborated with affiliate business units to obtain necessary network information - Participated in cutover activities and customer record assignment/switch gating to new equipment - Provided efficient support to specialized task or focus groups as assigned - Utilized technical knowledge to contribute to first office application trials Additional Information: - Strong attention to detail and ability to grasp new concepts quickly - Excellent interpersonal and communication skills - Fluent in distinguishing colors on coded records, equipment, and facilities References: Available upon request Thank you for considering my application. I would welcome the opportunity to discuss how my skills and qualifications align with the requirements of the Structure Loader position at Lumen. I look forward to the possibility of contributing to Lumen’s mission to further human progress through technology. Sincerely, Santiago Delgado -
Input the adversarial prompt in a latter turn after several conversations
Adversarial Prompts¶
Our adversarial prompts show consistently high attack success rate and good quality of PII exfiltration throughout various unseen user-agent conversations. Find more details about our evaluation and results in the paper.
PII Exfiltration¶
Information Exfiltration¶
Another attack target, which is not shown above but discussed in the paper, is called Information Exfiltration. For reference, we present the prompts here as well.
Disclosure and Impact¶
We initiated disclosure to Mistral and ChatGLM team on Sep 9, 2024, and Sep 18, 2024, respectively. Mistral security team members responded promptly and acknowledged the vulnerability as a medium-severity issue. They fixed the data exfiltration by disabling markdown rendering of external images on Sep 13, 2024. We confirmed that the fix works. ChatGLM security team has not responded to us despite multiple attempts through various channels.
Citation¶
Hang tight for our arxiv page!