AI Agent Tools - AI Security Technique

Researchers from Cato Networks demonstrated how adversaries can exploit AI-powered systems embedded in enterprise workflows to execute malicious actions with elevated privileges. This is achieved by crafting malicious inputs from external users such as support tickets that are later processed by internal users or automated systems using AI agents. These AI agents, operating with internal context and trust, may interpret and execute the malicious instructions, leading to unauthorized actions such as data exfiltration, privilege escalation, or system manipulation.

Researchers from Zenity demonstrated how an organization’s data can be exfiltrated via prompt injections that target an AI-powered customer service agent.

The target system is a customer service agent built by Zenity in Copilot Studio. It is modeled after an agent built by McKinsey to streamline its customer service needs. The AI agent listens to a customer service email inbox where customers send their engagement requests. Upon receiving a request, the agent looks at the customer’s previous engagements, understands who the best consultant for the case is, and proceeds to send an email to the respective consultant regarding the request, including all of the relevant context the consultant will need to properly engage with the customer.

The Zenity researchers begin by performing targeting to identify an email inbox that is managed by an AI agent. Then they use prompt injections to discover details about the AI agent, such as its knowledge sources and tools. Once they understand the AI agent’s capabilities, the researchers are able to craft a prompt that retrieves private customer data from the organization’s RAG database and CRM, and exfiltrate it via the AI agent’s email tool.

Vendor Response: Microsoft quickly acknowledged and fixed the issue. The prompts used by the Zenity researchers in this exercise no longer work, however other prompts may still be effective.

Embrace the Red demonstrated that Google Gemini is susceptible to automated tool invocation by delaying the execution to the next conversation turn. This bypasses a security control that restricts Gemini from invoking tools that can access sensitive user information in the same conversation turn that untrusted data enters context.