Armeria XDS TLS Peer Verification Bypass

Executive Summary

This vulnerability affects armeria-xds versions before 1.41.0, where xDS upstream TLS peer verification can be silently disabled. This allows man-in-the-middle attacks on xDS-managed upstream connections by bypassing certificate validation, enabling attackers to intercept and alter traffic between the client and server.

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Detection Guidance

To detect this vulnerability, check armeria-xds versions prior to 1.41.0 using commands like 'armeria-xds --version' or inspecting dependency files (e.g., pom.xml, build.gradle). Verify if CommonTlsContext lacks trusted_ca or system_root_certs in configurations. Monitor network traffic for unexpected TLS handshakes or certificate validation failures.

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Impact Analysis

An attacker could intercept, modify, or steal sensitive data transmitted over xDS-managed connections. This includes credentials, API calls, or other confidential information, leading to potential data breaches or unauthorized access to systems.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties, fines, or reputational damage.

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Mitigation Strategies

Immediately update armeria-xds to version 1.41.0 or later. Ensure every CertificateValidationContext includes trusted certificates or system root certificates. Audit xDS control plane configurations to prevent misconfigurations. Disable insecure modes and enforce explicit opt-in for untrusted connections.

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