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Scenario #245
Security
K8s v1.23, Azure AKS
Misconfigured TLS Certificates
Misconfigured TLS certificates led to insecure communication between Kubernetes components, exposing the cluster to potential attacks.
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What Happened
TLS certificates used for internal communication between Kubernetes components were either expired or misconfigured, leading to insecure communication channels.
Diagnosis Steps
- 1Inspected TLS certificate expiration dates and found that many certificates had expired or were incorrectly configured.
- 2Verified logs and found that some internal communication channels were using unencrypted HTTP due to certificate issues.
Root Cause
Expired or misconfigured TLS certificates allowed unencrypted communication between Kubernetes components.
Fix/Workaround
• Regenerated and replaced expired certificates.
• Configured Kubernetes components to use valid TLS certificates for all internal communications.Lessons Learned
Regularly monitor and rotate TLS certificates to ensure secure communication within the cluster.
How to Avoid
- 1Set up certificate expiration monitoring and automate certificate renewal.
- 2Regularly audit and update the Kubernetes cluster’s TLS certificates.