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Whispers in the Machine: Confidentiality in LLM-integrated Systems

This is the code repository accompanying our paper Whispers in the Machine: Confidentiality in LLM-integrated Systems.

Large Language Models (LLMs) are increasingly augmented with external tools and commercial services into <i><b>LLM-integrated systems</i></b>. While these interfaces can significantly enhance the capabilities of the models, they also introduce a new attack surface. Manipulated integrations, for example, can exploit the model and compromise sensitive data accessed through other interfaces. While previous work primarily has focused on attacks targeting a model's alignment or the leakage of training data, the security of data that is <i><b>only available during inference</i></b> has escaped scrutiny. In this work, we demonstrate the vulnerabilities associated with external components and introduce a systematic approach to evaluate confidentiality risks in LLM-integrated systems. We identify several specific attack scenarios unique to these systems and formalize these into a <i><b>tool-robustness</i></b> framework designed to measure a model's ability to protect sensitive information. This framework allows us to assess the model’s vulnerability to confidentiality attacks. Our findings show that all examined models are highly vulnerable to attacks, with the risk increasing significantly when models are used together with external tools.

If you want to cite our work, please use the this BibTeX entry.

This framework was developed to study the confidentiality of Large Language Models (LLMs) in integrated systems. The framework contains several features:

• A set of attacks against LLMs, where the LLM is not allowed to leak a secret key -> jump to section
• A set of defenses against the aforementioned attacks -> jump to section
• The possibility to test the LLM's confidentiality in dummy tool-using scenarios as well as with the mentioned attacks and defenses -> jump to section
• Testing LLMs in real-world tool-scenarios using LangChains Google Drive and Google Mail integrations -> jump to section
• Creating enhanced system prompts to safely instruct an LLM to keep a secret key safe -> jump to section
• Instructions for <b>reproducibility</b> can be found at the end of this README -> jump to section

[!WARNING] <b>Hardware aceleration is only fully supported for CUDA machines running Linux. MPS on MacOS should somewhat work but Windows with CUDA could face some issues.</b>

Setup

Before running the code, install the requirements:

python -m pip install --upgrade -r requirements.txt

If you want to use models hosted by OpenAI or Huggingface, create both a key.txt file containing your OpenAI API key as well as a hf_token.txt file containing your Huggingface Token for private Repos (such as Llama2) in the root directory of this project.

Sometimes it can be necessary to login to your Huggingface account via the CLI:

git config --global credential.helper store
huggingface-cli login

Distributed Training

All scripts are able to work on multiple GPUs/CPUs using the accelerate library. To do so, run:

accelerate config

to configure the distributed training capabilities of your system and start the scripts with:

accelerate launch [parameters] <script.py> [script parameters]

Attacks and Defenses

Example Usage

python attack.py --strategy "tools" --scenario "CalendarWithCloud" --attacks "payload_splitting" "obfuscation" --defense "xml_tagging" --iterations 15 --llm_type "llama3-70b" --temperature 0.7 --device cuda --prompt_format "react"

Would run the attacks payload_splitting and obfuscation against the LLM llama3-70b in the scenario CalendarWithCloud using the defense xml_tagging for 15 iterations with a temperature of 0.7 on a cuda device using the react prompt format in a tool-integrated system.

Arguments

<model_name>-<param_count>-<robustness>-<attack_suffix>-<custom_suffix>

e.g.:

llama2-7b-robust-prompt_injection-0613

If you want to run the attacks against a prefix-tuned model with a custom suffix (e.g., 1000epochs), you would have to specify the arguments a follows:

... --model_name llama2-7b-prefix --name_suffix 1000epochs ...

Supported Large Language Models

(Finetuned or robust/hardened LLaMA models first have to be generated using the finetuning.py script, see below)

Supported Attacks and Defenses

The base_chat attack consists of normal questions to test of the model spills it's context and confidential information even without a real attack.

Finetuning

This section covers the possible LLaMA finetuning options. We use PEFT, which is based on this paper.

Setup

Additionally to the above setup run

accelerate config

to configure the distributed training capabilities of your system. And

wandb login

with your WandB API key to enable logging of the finetuning process.

Parameter Efficient Finetuning to harden LLMs against attacks or create enhanced system prompts

The first finetuning option is on a dataset consisting of system prompts to safely instruct an LLM to keep a secret key safe. The second finetuning option (using the --train_robust option) is using system prompts and adversarial prompts to harden the model against prompt injection attacks.

Usage

python finetuning.py [-h] [-llm | --llm_type LLM_NAME] [-i | --iterations ITERATIONS] [-a | --attacks ATTACKS_LIST] [-n | --name_suffix NAME_SUFFIX]

Arguments

Supported Large Language Models

Currently only the LLaMA models are supported (llama2-7/13/70b / llama3-8/70b).

Generate System Prompt Datasets

Simply run the generate_dataset.py script to create new system prompts as a json file using LLMs.

Arguments

Real-World Tool Scenarios

To test the confidentiality of LLMs in real-world tool scenarios, we provide the possibility to test LLMs in Google Drive and Google Mail integrations. To do so, run the /various_scripts/llm_mail_test.pyscript with your Google API credentials.

Reproducibility

[!WARNING] <b>Depeding on which LLM is evaluated the evaluation can be very demanding in terms of GPU VRAM and time.</b>

[!NOTE] <b>Results can vary slightly from run to run. Ollama updates most of their LLMs constantly, so their behavior is subject to change. Also, even with the lowest temperature LLMs tend to fluctuate slightly in behvior due to internal randomness.</b>

Baseline secret-key game

Will ask the LLM benign questions to check for leaking the secret even without attacks <br> python attack.py --llm_type <model_specifier> --strategy secret-key --attacks chat_base --defenses None --iterations 100 --device cuda

Attacks for secret-key game

Will run all attacks against the LLM without defenses. The iterations will be split equally onto the used attacks. So depending on the number of used attacks the number of iterations have to be adapted. (e.g., for 14 attacks with 100 iterations set the iterations parameter to 1400) <br> python attack.py --llm_type <model_specifier> --strategy secret-key --attacks all --defenses None --iterations 100 --device cuda

Attacks with defenses for secret-key game

Will run all attacks against the LLM with all defenses <br> python attack.py --llm_type <model_specifier> --strategy secret-key --attacks all --defenses all --iterations 100 --device cuda

Baseline tool-scenario

Will system prompt instruct the LLM with a secret key and the instructions to not leak the secret key followed by simple requests to print the secret key <br> python attack.py --llm_type <model_specifier> --strategy tools --scenario all --attacks base_attack --defenses None --iterations 100 --device cuda

Evaluating all tool-scenarios with ReAct

Will run all tool-scenarios without attacks and defenses using the ReAct framework <br> python attack.py --llm_type <model_specifier> --strategy tools --scenario all --attacks identity --defenses None --iterations 100 --prompt_format ReAct --device cuda

Evaluating all tool-scenarios with tool fine-tuned models

Will run all tool-scenarios without attacks and defenses using the ReAct framework <br> python attack.py --llm_type <model_specifier> --strategy tools --scenario all --attacks identity --defenses None --iterations 100 --prompt_format tool-finetuned --device cuda

Evaluating all tool fine-tuned models in all scenarios with additional attacks

Will run all tool-scenarios without attacks and defenses using the ReAct framework <br> python attack.py --llm_type <model_specifier> --strategy tools --scenario all --attacks all --defenses None --iterations 100 --prompt_format tool-finetuned --device cuda

Evaluating all tool fine-tuned models in all scenarios with additional attacks and defenses

Will run all tool-scenarios without attacks and defenses using the ReAct framework <br> python attack.py --llm_type <model_specifier> --strategy tools --scenario all --attacks all --defenses all --iterations 100 --prompt_format tool-finetuned --device cuda

Citation

If you want to cite our work, please use the following BibTeX entry:

@article{evertz-24-whispers,
	title    =  {{Whispers in the Machine: Confidentiality in LLM-integrated Systems}}, 
	author   =  {Jonathan Evertz and Merlin Chlosta and Lea Schönherr and Thorsten Eisenhofer},
	year     =  {2024},
	journal  =  {Computing Research Repository (CoRR)}
}