> ## Documentation Index
> Fetch the complete documentation index at: https://cloudanix.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Consider External Secret Storage

### More Info:

Native Kubernetes Secrets are only base64-encoded and stored in etcd. Consider a dedicated external secrets management solution to improve secret protection and lifecycle management.

### Risk Level

Medium

### Address

Security

### Compliance Standards

* APRA CPS 234 (Australia)
* BSI C5 (Germany)
* Brazil LGPD
* CCPA / CPRA (California)
* CIS Critical Security Controls v8
* CIS GKE
* CMMC 2.0
* CSA Cloud Controls Matrix v4
* DPDPA
* Digital Operational Resilience Act (EU)
* Essential 8
* ISO/IEC 27017
* ISO/IEC 27018
* ISO/IEC 27701
* KSA PDPL
* MAS Technology Risk Management (Singapore)
* MITRE ATT\&CK (Cloud)
* NIS2 Directive
* NIST SP 800-171
* NYDFS 23 NYCRR 500
* SWIFT Customer Security Controls Framework
* Sarbanes-Oxley IT General Controls
* UK NCSC Cyber Assessment Framework

### Triage and Remediation

<Tabs>
  <Tab title="Remediation">
    ### Remediation

    <AccordionGroup>
      <Accordion title="Manual Steps" defaultOpen="true">
        1. **Inventory how Kubernetes Secrets are currently used**
           * On any machine with kubectl access, list all Secrets and their types:
             ```bash theme={null}
             kubectl get secrets -A -o wide
             ```
           * Inspect a few representative secrets (workload-related, not service-account tokens):
             ```bash theme={null}
             kubectl get secret -n <namespace> <secret-name> -o yaml
             ```
           * Note where secrets are consumed (Pods, Deployments, StatefulSets, Jobs) via `env.valueFrom.secretKeyRef` and `volumes.secret`.

        2. **Check for existing external secret management integrations**
           * Look for operators/controllers that integrate with external stores (for example, External Secrets Operator, Secrets Store CSI Driver, or cloud‑specific controllers):
             ```bash theme={null}
             kubectl get pods -A | egrep -i 'secret|vault|csi'
             kubectl get crds | egrep -i 'secret|vault|externalsecret|csi'
             ```
           * If such components exist, inspect their configuration to see which backend is in use (e.g., AWS Secrets Manager, GCP Secret Manager, Azure Key Vault, HashiCorp Vault).

        3. **Review cloud provider secret-management options and policies**
           * In your cloud console and/or IaC, identify whether a managed secret store is already configured for this cluster’s workloads (e.g., IAM roles, Workload Identity, KMS keys, Secret Manager/Key Vault/Secrets Manager resources).
           * Confirm if organizational policy requires use of that store instead of (or in addition to) Kubernetes Secrets for application credentials.

        4. **Decide which secrets must move to external storage**
           * Based on the inventory, classify secrets by sensitivity (database passwords, API keys, encryption keys vs. low‑risk config).
           * For highly sensitive or regulated data, decide to migrate them to a supported external secret store, following your cloud provider’s recommended integration pattern (operator, CSI driver, or sidecar).

        5. **Plan and implement the migration pattern**
           * For each selected workload, design how it will obtain secrets from the external store (environment variables injected by a controller, mounted files via CSI, or app‑level API calls).
           * Update or create manifests (via kubectl and IaC) to consume secrets from the chosen integration (for example, defining `ExternalSecret` or CSI SecretProviderClass resources), and remove or deprecate direct reliance on native Kubernetes Secrets for those values.

        6. **Verify reduced reliance on native Kubernetes Secrets**
           * After changes, confirm that sensitive values are now sourced via external mechanisms and that corresponding Kubernetes Secrets are no longer needed or only store references/tokens as designed:
             ```bash theme={null}
             kubectl get secrets -A
             kubectl describe pod -n <namespace> <pod-name>
             ```
           * Ensure applications start successfully and retrieve expected secret values via the external store before removing any legacy Kubernetes Secrets.
      </Accordion>

      <Accordion title="Using kubectl">
        ```bash theme={null}
        # 1) List all namespaces that may contain Secrets
        # Run on: any machine with kubectl access
        kubectl get ns
        ```

        Review which namespaces are used for applications (beyond kube-system, kube-public, etc.); these are likely to contain sensitive Secrets.

        ```bash theme={null}
        # 2) List all Secrets in all namespaces (names and types only)
        kubectl get secrets --all-namespaces
        ```

        Potential problems indicated by:

        * Many `Opaque` or `kubernetes.io/dockerconfigjson` secrets in app namespaces.
        * Secrets present in non-critical namespaces where config maps would suffice.

        ```bash theme={null}
        # 3) Inspect specific Secrets for sensitive payloads
        # Replace <namespace> and <secret-name> based on previous output
        kubectl get secret <secret-name> -n <namespace> -o yaml
        ```

        Look at the `.data` entries (base64-encoded). Problems indicated by:

        * Keys like `password`, `token`, `apikey`, `ssh-privatekey`, `tls.key`, `db_url`, etc.
        * Large numbers of such sensitive values stored as native Secrets instead of a dedicated external store.

        ```bash theme={null}
        # 4) Find Pods that mount or reference Secrets
        kubectl get pods -A -o jsonpath='{range .items[*]}{.metadata.namespace}{" "}{.metadata.name}{"\n"}{end}' \
          | while read ns pod; do
              echo "=== $ns/$pod ==="
              kubectl get pod "$pod" -n "$ns" -o jsonpath='Volumes: {range .spec.volumes[*]}{.name}{"=>"}{.secret.secretName}{"\n"}{end}EnvFrom: {range .spec.containers[*].envFrom[*]}{.secretRef.name}{"\n"}{end}Env: {range .spec.containers[*].env[*]}{.name}{"=>"}{.valueFrom.secretKeyRef.name}{"\n"}{end}' 2>/dev/null
              echo
            done
        ```

        Problems indicated by:

        * Critical workloads (auth, payments, PII, production databases) consuming many Secrets via env vars or volumes.
        * Secrets used across many Pods/namespaces, suggesting centralized secrets would be better managed in an external vault.

        ```bash theme={null}
        # 5) Check for any use of external secret managers already (for context)
        # Common CRDs used by external secret operators
        kubectl get crd | egrep -i 'secret|vault|externalsecret'
        ```

        Interpretation:

        * If you see CRDs like `externalsecrets.external-secrets.io`, `clusterssecrets`, `vaultsecrets`, the cluster may already integrate with an external secrets manager.
        * If no such resources exist and Steps 2–4 show widespread in-cluster storage of high-value credentials, that suggests a stronger case for adopting an external secrets management solution as recommended by the benchmark.
      </Accordion>

      <Accordion title="Automation">
        ```bash theme={null}
        #!/usr/bin/env bash
        # Purpose: Cluster-wide secrets usage report to support review of external secret storage adoption.
        # Runs on: any machine with kubectl access and cluster-wide read permissions.

        set -euo pipefail

        # 1) Basic cluster context
        echo "=== Cluster Context ==="
        kubectl config current-context
        echo

        # 2) Count and list native Kubernetes Secret objects
        echo "=== Native Kubernetes Secrets (all namespaces) ==="
        kubectl get secrets --all-namespaces | wc -l | awk '{print "Total Secret objects (including header): "$1}'
        echo

        # Detailed summary by type (helps spot high‑risk uses like generic Opaque)
        echo "--- Secret count by type ---"
        kubectl get secrets --all-namespaces -o json \
          | jq -r '.items[] | [.metadata.namespace, .type] | @tsv' \
          | sort | uniq -c | sort -nr \
          | awk '{printf "%7s  ns=%s  type=%s\n", $1, $2, $3}'
        echo

        # 3) Show a sample of Secrets by type (names only, no data)
        echo "--- Sample Secrets by type (names only, per namespace) ---"
        kubectl get secrets --all-namespaces -o json \
          | jq -r '.items[] | [.metadata.namespace, .metadata.name, .type] | @tsv' \
          | column -t | head -100
        echo

        # 4) Detect common external-secrets controllers / CRDs in use
        echo "=== External Secret Integrations Detected ==="

        echo "--- Checking for ExternalSecrets.io (external-secrets) ---"
        kubectl api-resources --api-group=external-secrets.io 2>/dev/null || echo "No external-secrets.io API group found"
        echo
        kubectl get crd | grep -i externalsecret || echo "No ExternalSecret CRD found"
        echo
        kubectl get ns | grep -Ei 'secret|vault|external' || echo "No namespaces with obvious secret-related names"
        echo

        echo "--- Checking for Secrets Store CSI Driver ---"
        kubectl api-resources --api-group=secrets-store.csi.x-k8s.io 2>/dev/null || echo "No secrets-store.csi.x-k8s.io API group found"
        echo
        kubectl get crd | grep -i secretproviderclass || echo "No SecretProviderClass CRD found"
        echo

        # 5) Workload references to Secret objects (indicates reliance on native Secrets)
        echo "=== Workloads referencing native Kubernetes Secrets ==="

        # helper: list resources that mount secrets as volumes or environment variables
        for kind in deployment statefulset daemonset job cronjob pod replicaSet replicaset; do
          echo "--- ${kind^}s using secrets ---"
          kubectl get "$kind" --all-namespaces -o json 2>/dev/null \
            | jq -r '
              .items[]
              | . as $obj
              | ($obj.spec.template // $obj)  # handle Pod vs controllers
              | [
                  $obj.metadata.namespace,
                  $obj.metadata.name,
                  "'"$kind"'",
                  ([
                     (.spec.volumes[]? | select(.secret != null) | "vol:"+.secret.secretName),
                     (.spec.containers[]?.env[]? | select(.valueFrom.secretKeyRef != null) | "env:"+.valueFrom.secretKeyRef.name),
                     (.spec.initContainers[]?.env[]? | select(.valueFrom.secretKeyRef != null) | "env:"+.valueFrom.secretKeyRef.name)
                   ] | unique | join(","))
                ]
              | @tsv
            ' 2>/dev/null \
            | awk -F'\t' 'NF==4 && $4!="" {printf "ns=%s  kind=%s  name=%s  secrets=[%s]\n", $1, $3, $2, $4}' \
            || echo "No $kind resources found or no secret usage detected"
          echo
        done

        # 6) Cluster-wide summary: namespaces with most native Secrets referenced by workloads
        echo "=== Summary: Workload Secret Usage by Namespace ==="
        kubectl get deploy,statefulset,daemonset,job,cronjob,pod --all-namespaces -o json 2>/dev/null \
          | jq -r '
            .items[]
            | . as $obj
            | ($obj.spec.template // $obj)
            | [
                $obj.metadata.namespace,
                ([
                   (.spec.volumes[]? | select(.secret != null) | .secret.secretName),
                   (.spec.containers[]?.env[]? | select(.valueFrom.secretKeyRef != null) | .valueFrom.secretKeyRef.name),
                   (.spec.initContainers[]?.env[]? | select(.valueFrom.secretKeyRef != null) | .valueFrom.secretKeyRef.name)
                 ] | unique | length)
              ]
            | @tsv
          ' 2>/dev/null \
          | awk -F'\t' 'NF==2 && $2>0 {print $1}' \
          | sort | uniq -c | sort -nr \
          | awk '{printf "%7s namespaces-with-secrets: %s\n", $1, $2}'
        echo

        echo "=== Interpretation Guidance ==="
        cat <<'EOF'
        This script does NOT decide compliance automatically. Use the output as follows:

        - High native Secret counts and many workloads referencing Opaque or generic Secrets:
          * Indicates strong reliance on built-in Kubernetes Secrets and etcd storage.
          * From a CIS perspective, this is where you should consider migrating to or integrating with
            an external secrets management solution (cloud KMS-based, vault, or similar).

        - Absence of external-secrets-related CRDs or CSI drivers:
          * Suggests no cluster-integrated external secret manager is currently in use.
          * This is a gap if your policy is to store application secrets externally.

        - Presence of ExternalSecret / SecretProviderClass or similar CRDs and controllers:
          * Indicates that external secret management exists.
          * Review:
            - Which namespaces and apps are using these external mechanisms vs. native Secrets.
            - Whether particularly sensitive apps (payments, auth, PII) still rely on Opaque Secrets.

        Use this report to:
        - Identify namespaces and workloads that should be prioritized for external secret integration.
        - Confirm where external secret controllers are installed and actually used in manifests.
        EOF
        ```
      </Accordion>
    </AccordionGroup>
  </Tab>
</Tabs>