Remote Code Execution in IBM Langflow OSS

Executive Summary

This vulnerability in IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoofing the X-Forwarded-For header with 127.0.0.1. This enables arbitrary writes to IDE config files like ~/.cursor/mcp.json.

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Detection Guidance

To detect this vulnerability, inspect HTTP request logs for suspicious X-Forwarded-For headers containing 127.0.0.1 from remote clients. Check for unauthorized writes to IDE config files like ~/.cursor/mcp.json. Monitor network traffic for proxy header manipulation attempts.

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Impact Analysis

An attacker could exploit this to modify configuration files on your system, potentially leading to unauthorized access, data manipulation, or further attacks. Since it requires authentication, the risk is limited to users with existing access.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing unauthorized remote access to sensitive configuration files. The arbitrary write access to IDE config files may expose personal or protected health information if such files contain or reference sensitive data. Unauthorized modifications could also lead to data integrity issues, violating GDPR's accuracy principle and HIPAA's integrity requirements.

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Mitigation Strategies

Update IBM Langflow OSS to the latest version beyond 1.11.2 to address the spoofing vulnerability. Restrict network access to prevent unauthorized requests and monitor for suspicious X-Forwarded-For headers.

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