Arbitrary Code Execution in Ouroboros via Malicious .env File

Executive Summary

Ouroboros is a runtime for AI coding agents that records actions and enforces user-defined policies. Prior to version 0.39.0, it loads the .env file from the current working directory. Attackers can exploit this by including a malicious script in a repository and setting environment variables like OUROBOROS_CLI_PATH to point to it. When users run Ouroboros commands, the malicious script executes instead of the intended CLI, leading to arbitrary code execution and potential system takeover.

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Detection Guidance

Check for the presence of a .env file in directories where Ouroboros commands are run. Inspect the file for suspicious entries like OUROBOROS_CLI_PATH or OPENCODE_CLI_PATH pointing to unexpected scripts. Verify Ouroboros version is 0.39.0 or later.

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Impact Analysis

If you clone a malicious repository and run Ouroboros commands in its directory, an attacker could execute arbitrary code on your system. This could allow them to take control of your machine, steal data, install malware, or perform other malicious actions.

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Mitigation Strategies

Upgrade Ouroboros to version 0.39.0 or later. Avoid running Ouroboros commands in untrusted directories. Review .env files in project directories for malicious entries. Remove any suspicious CLI path variables.

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