OpsTree BuildPiper Authorization Bypass Vulnerability

Executive Summary

This vulnerability is an authorization bypass in OpsTree BuildPiper before version 2.7.0. It allows authenticated users to attach another application's environment to their service by supplying a foreign project_env_id. This bypasses intended project isolation, enabling unauthorized CI configuration, build execution, and deployment operations using environments that should not be accessible.

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Detection Guidance

To detect this vulnerability, monitor API requests involving the project_env_id parameter in BuildPiper versions prior to 2.7.0. Check for unauthorized associations of environments from different projects by reviewing logs for CI/CD pipeline configurations and deployment triggers. Look for anomalies where a user's service is linked to an environment not belonging to their project.

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Impact Analysis

Attackers can exploit this to configure CI pipelines and trigger builds and deployments using the victim application's configuration, registries, and deployment infrastructure. This could lead to unauthorized code execution, data breaches, or service disruptions in affected environments.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating compliance requirements for GDPR and HIPAA. It undermines role-based access control and automated security checks, potentially resulting in non-compliance with data protection and privacy regulations.

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Mitigation Strategies

Immediately upgrade BuildPiper to version 2.7.0 or later to address the authorization bypass. Ensure strict server-side validation of environment ownership before allowing associations. Re-validate environment ownership during all CI/CD pipeline operations and deployment processes.

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