Improper Certificate Validation in Go-Micro Framework

Executive Summary

This vulnerability is an improper certificate validation flaw in go-micro versions before 6.0.0. The shared TLS helper sets InsecureSkipVerify to true by default, allowing network attackers to impersonate services. Man-in-the-middle attackers can intercept or modify traffic for gRPC, HTTP, RabbitMQ, and registry services like Consul or etcd, potentially exposing authentication tokens and credentials.

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Detection Guidance

Check if your go-micro services are using versions before 6.0.0 by running: go list -m github.com/micro/go-micro. Inspect TLS configuration in code for InsecureSkipVerify=true. Monitor network traffic for unexpected certificate errors or MITM patterns. Use environment variable checks: env | grep MICRO_TLS_SECURE to see if secure TLS is enabled.

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Impact Analysis

Attackers can intercept sensitive data like authentication tokens, API keys, user data, and database credentials transmitted between services. They can also modify traffic to alter requests or responses, leading to unauthorized access or data tampering. Services using go-micro without explicit secure TLS configuration are vulnerable.

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Compliance Impact

This vulnerability can lead to unauthorized access to sensitive data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties, reputational damage, and loss of trust due to data breaches.

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Mitigation Strategies

Upgrade to go-micro version 6.0.0 or later. Set environment variable MICRO_TLS_SECURE=true for all services. Replace InsecureSkipVerify=true with SecureConfig() in TLS configurations. Regenerate and validate all service certificates. Audit and rotate exposed credentials and tokens.

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