Remote Code Execution in IBM Langflow OSS

Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.11.2 have an authorization bypass vulnerability in the flow build process. A remote authenticated attacker with a non-superuser account can exploit this to execute arbitrary Python code as the Langflow service identity. The flaw occurs because the flow-build endpoint fails to validate administrator-only restrictions or superuser status before processing attacker-controlled component code.

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Detection Guidance

To detect this vulnerability, check if your Langflow OSS instance is running a vulnerable version (1.0.0 through 1.11.2). Use commands like 'pip show langflow' or 'docker inspect <container_name> | grep langflow' to verify the version. Monitor logs for unauthorized flow-build attempts or suspicious Python code execution.

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Impact Analysis

This vulnerability allows an attacker to execute arbitrary code on the affected system. They could access application secrets, environment variables, files, network destinations, and all resources accessible to the Langflow service account. This could lead to data breaches, unauthorized system access, or further compromise of the network.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations using affected versions may face legal penalties, data breach notifications, and reputational damage due to non-compliance with data protection standards.

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Mitigation Strategies

Immediately upgrade Langflow OSS to version 1.11.3 or later. There are no available workarounds, so upgrading is the only mitigation. Ensure no unauthorized users have access to the flow-build endpoint and review logs for signs of exploitation.

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