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Introduction:
When a user clicks your domain, a complex cascade of DNS resolution, TLS handshakes, load balancer routing, and pod-level processing unfolds inside Amazon EKS. Understanding this production request lifecycle is critical for cloud security—because each layer, from Route 53 to StatefulSet storage, introduces potential misconfigurations that attackers weaponize.
Learning Objectives:
- Map the complete request flow from user browser to persistent EBS storage inside EKS, identifying security boundaries at each stage.
- Implement hardended secrets management using AWS Secrets Manager, IRSA, and External Secrets Operator (ESO) to eliminate plaintext credentials.
- Detect and mitigate common EKS attack vectors including TLS downgrade, Ingress bypass, and RBAC privilege escalation.
You Should Know:
- DNS and TLS Hardening: From Namecheap to Route 53 with ACM
What this does:
A user’s DNS query traverses your registrar (Namecheap) to AWS Route 53, which returns an Alias record pointing to an Application Load Balancer (ALB). The ALB terminates TLS using an ACM certificate. Misconfigured DNS or weak TLS ciphers expose your app to man-in-the-middle attacks.
Step-by-step guide:
1. Verify DNS propagation and DNSSEC status
(Linux/macOS)
dig +dnssec yourdomain.com nslookup yourdomain.com
(Windows)
Resolve-DnsName -Name yourdomain.com -Type A
2. Check Route 53 Alias record targeting
aws route53 list-resource-record-sets --hosted-zone-id ZXXXXXXXXXX --query "ResourceRecordSets[?Type == 'A']"
3. Test TLS cipher strength and certificate validity
nmap --script ssl-enum-ciphers -p 443 yourdomain.com openssl s_client -connect yourdomain.com:443 -tls1_2
4. Enforce modern TLS policies in ACM
aws elbv2 modify-listener --listener-arn arn:aws:elasticloadbalancing:... --ssl-policy ELBSecurityPolicy-TLS13-1-2-2021-06
- Ingress and ALB Controller Security: Routing with Least Privilege
What this does:
The ALB forwards traffic to the Kubernetes Ingress resource, which uses host/path rules to direct requests to the correct application pod. Attackers can exploit overly permissive Ingress rules or misconfigured ALB security groups to access internal services.
Step-by-step guide to lock down Ingress:
1. List Ingress resources and inspect annotation exposure
kubectl get ingress --all-namespaces -o yaml | grep -E "host:|path:|alb.ingress.kubernetes.io"
- Restrict ALB security group to only necessary CIDRs
aws ec2 authorize-security-group-ingress --group-id sg-xxxxx --protocol tcp --port 443 --cidr 203.0.113.0/24 aws ec2 revoke-security-group-ingress --group-id sg-xxxxx --protocol tcp --port 443 --cidr 0.0.0.0/0
-
Enable WAF on ALB to block SQLi and XSS
aws wafv2 associate-web-acl --web-acl-arn arn:aws:wafv2:... --resource-arn arn:aws:elasticloadbalancing:.../loadbalancer/app/my-alb/...
4. Audit Ingress path-routing for unintended wildcards
Secure Ingress example - avoid / catch-all without authentication apiVersion: networking.k8s.io/v1 kind: Ingress metadata: annotations: nginx.ingress.kubernetes.io/whitelist-source-range: "10.0.0.0/8" spec: rules: - host: app.example.com http: paths: - path: /api pathType: Prefix backend: service: name: api-service
3. Pod-to-Database Hardening: MySQL StatefulSet with Headless Service
What this does:
The backend pod queries a MySQL StatefulSet via a headless service. Without network policies, any pod in the cluster can attempt database connections. Attackers who compromise a frontend pod can pivot to the database.
Step-by-step network isolation:
1. Deploy a strict Kubernetes NetworkPolicy
apiVersion: networking.k8s.io/v1 kind: NetworkPolicy metadata: name: deny-all-except-backend spec: podSelector: matchLabels: app: mysql policyTypes: - Ingress ingress: - from: - podSelector: matchLabels: app: backend ports: - protocol: TCP port: 3306
2. Apply the policy
kubectl apply -f mysql-network-policy.yaml
3. Verify connectivity
kubectl exec -it frontend-pod -- nc -zv mysql-headless 3306 Should fail kubectl exec -it backend-pod -- mysql -h mysql-headless -u user -p Should succeed
4. Enable MySQL SSL enforcement
ALTER USER 'appuser'@'%' REQUIRE SSL; SHOW VARIABLES LIKE 'have_ssl';
- Persistent Storage Security: EBS Encryption at Rest and in Transit
What this does:
EBS volumes persist MySQL data. Unencrypted EBS volumes or misconfigured KMS keys allow data exfiltration if an attacker gains AWS console access or retrieves a snapshot.
Step-by-step encryption hardening:
1. Check if existing EBS volumes are encrypted
aws ec2 describe-volumes --filters Name=attachment.instance-id,Values=i-xxxxx --query "Volumes[].Encrypted"
2. Enforce encryption by default for new PVCs
aws ec2 enable-ebs-encryption-by-default
3. Create a KMS key with least-privilege policy
aws kms create-key --description "EKS data at rest" aws kms create-alias --alias-name alias/eks-pv-encryption --target-key-id <key-id>
4. Define StorageClass with KMS key reference
apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: encrypted-ebs provisioner: ebs.csi.aws.com parameters: encrypted: "true" kmsKeyId: arn:aws:kms:us-east-1:123456789012:key/xxxxx
- Secrets Flow Intrusion Prevention: AWS Secrets Manager + IRSA + ESO
What this does:
Secrets are stored in AWS Secrets Manager, accessed by pods via IAM Roles for Service Accounts (IRSA) and External Secrets Operator (ESO). Misconfigured IRSA trust policies or unencrypted etcd can leak database credentials.
Step-by-step secure secrets injection:
1. Create IAM role with IRSA trust policy
aws iam create-role --role-name eks-secrets-reader --assume-role-policy-document file://trust-policy.json
(trust-policy.json allows `sts:AssumeRoleWithWebIdentity` for the service account)
2. Annotate Kubernetes service account
kubectl annotate serviceaccount my-sa eks.amazonaws.com/role-arn=arn:aws:iam::123456789012:role/eks-secrets-reader
3. Install External Secrets Operator and define SecretStore
apiVersion: external-secrets.io/v1beta1 kind: SecretStore metadata: name: aws-secretsmanager spec: provider: aws: service: SecretsManager region: us-east-1 auth: jwt: serviceAccountRef: name: my-sa
- Pull secret into Kubernetes secret (audit for exposure)
kubectl get secrets my-db-secret -o yaml | grep -E "password|token" | base64 -d
Mitigation: Enable etcd encryption at rest
EKS control plane: enable envelope encryption via KMS
aws eks update-cluster-config --name my-cluster --encryption-config '[{"resources":["secrets"],"provider":{"keyArn":"arn:aws:kms:..."}}]'
6. Image Pull Authentication and Supply Chain Attacks
What this does:
Pods authenticate to ECR or Docker Hub using imagePullSecrets. Stale or overprivileged pull secrets allow attackers to pull vulnerable images or push malicious ones.
Step-by-step supply chain hardening:
1. Audit imagePullSecrets
kubectl get serviceaccounts -o json | jq '.items[].imagePullSecrets'
2. Rotate pull secrets and enforce short-lived credentials
aws ecr get-login-password --region us-east-1 | kubectl create secret docker-registry regcred --docker-server=123456789012.dkr.ecr.us-east-1.amazonaws.com --docker-username=AWS --docker-password-stdin
3. Enable image vulnerability scanning
aws ecr put-image-scanning-configuration --repository-name my-repo --image-scanning-configuration scanOnPush=true
- Use admission controller (Kyverno) to block images with critical CVEs
apiVersion: kyverno.io/v1 kind: ClusterPolicy metadata: name: block-critical-cve spec: validationFailureAction: Enforce rules:</li> </ol> - name: check-cve-score match: resources: kinds: - Pod validate: message: "Images with critical CVEs are blocked" pattern: spec: containers: - image: "!:cve-critical"
- Monitoring the Entire Request Flow with AWS CloudTrail and GuardDuty
What this does:
End-to-end logging of DNS, ALB, Kubernetes API, and EBS events is essential to detect anomalies like unexpected pod-to-database connections or secret retrieval spikes.
Step-by-step detection setup:
1. Enable CloudTrail for EKS management events
aws cloudtrail create-trail --name eks-audit --s3-bucket-name my-audit-bucket --is-multi-region-trail aws cloudtrail start-logging --name eks-audit
2. Activate GuardDuty EKS protection
aws guardduty create-detector --enable aws guardduty update-eks-protection --detector-id <id> --enable --add-kubernetes-audit-logs
3. Query for abnormal Ingress modifications
aws cloudtrail lookup-events --lookup-attributes AttributeKey=EventName,AttributeValue=UpdateIngress --start-time "2025-01-01T00:00:00Z"
What Undercode Say:
- EKS production flows are only as secure as their weakest link – a misconfigured Ingress or unencrypted EBS volume nullifies TLS and IAM protections.
- Secrets management via IRSA+ESO is superior to static imagePullSecrets, but requires rigorous audit of trust policies and etcd encryption.
- Network policies remain the most underutilized EKS security control – most breaches pivot laterally because default “allow all” is never tightened.
- Supply chain attacks start at image pull – without admission controllers blocking critical CVEs, you’re one compromised base image away from full cluster takeover.
Prediction:
Within 18 months, AWS will mandate envelope encryption for all EKS secrets by default, and GuardDuty will incorporate real-time eBPF-based pod-to-database anomaly detection. Attackers will shift focus to exploiting IRSA trust chain misconfigurations and unpatched ALB controller vulnerabilities. Organizations that treat EKS as a shared-responsibility boundary—automating network policy enforcement and secrets rotation—will survive; those relying on default configurations will face public data breaches originating from inside their own cluster.
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Reported By: Adityajaiswal7 Devops – Hackers Feeds
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