Container Security

Container Security

Thin router for container and Kubernetes security assessments. Load the reference, workflow, or payload file you need — do not read all of them.

When to Use

• Scanning Docker/OCI images for CVEs (single image or pipeline)
• Generating or attesting SBOMs (Syft / CycloneDX / SPDX)
• Diffing SBOMs across releases to flag newly-introduced CVEs
• Auditing a live Kubernetes cluster (CIS / NSA / MITRE)
• Mapping K8s RBAC and finding privilege-escalation paths
• Reviewing NetworkPolicy coverage
• Authoring Falco / Tetragon runtime rules
• Analyzing or testing container escape vectors (authorized only)
• Docker daemon / host hardening review

Trigger Phrases

"scan this image", "trivy / grype / syft", "audit k8s cluster", "kube-bench", "kubescape", "run CIS benchmark", "check RBAC", "networkpolicy coverage", "falco rule", "container escape", "SBOM diff", "new CVEs since last release".

When NOT to Use This Skill

Rule of thumb: pre-deployment YAML → iac-security; running cluster or built image → this skill.

Decision Tree

Target?
|
|-- Built/registry image ----------> workflows/image_scan.md
|     \-- two images to compare? --> workflows/sbom_diff.md    (FLAGSHIP)
|
|-- Dockerfile source -------------> examples/vulnerable_dockerfile.md
|                                    + hadolint (references/image_scanning.md)
|
|-- Live K8s cluster --------------> workflows/cluster_audit.md
|     |-- RBAC deep-dive ----------> workflows/rbac_analysis.md
|     |-- Network policy gap ------> workflows/network_policy_review.md
|     \-- CIS benchmark only ------> references/kubernetes_hardening.md
|
|-- Runtime monitoring ------------> references/runtime_security.md
|                                    + examples/falco_custom_rule.yaml
|
\-- Escape testing (authorized) --> references/container_escape.md
                                     + payloads/container_escape_poc.md

Parallelism Hints

Run concurrently (no shared state, no rate conflicts):

• Trivy + Grype + Syft + Hadolint on the same image — always parallel
• Scanners across multiple image tags — one sub-agent per tag
• kube-bench across nodes — deploy as DaemonSet, collect in parallel
• Kubescape frameworks (nsa, mitre, cis) — parallel invocations
• RBAC object fetches (clusterroles, roles, bindings) — parallel
• SBOM diff Grype scans (prior vs current) — parallel
• Per-principal RBAC graph expansion — parallel (stateless)

Sequential only:

• Cosign attestation (needs SBOM first)
• Cross-scanner CVE consensus merge (needs all scanner outputs)
• Finding emission (needs evaluated data)

Sub-Agent Delegation

• Multi-image pipeline: spawn one sub-agent per image; each runs workflows/image_scan.md and returns finding records. Parent merges.
• Multi-cluster environment: one sub-agent per cluster; each runs workflows/cluster_audit.md with its own kubecontext.
• Cluster audit fan-out: parent runs inventory, then spawns sub-agents for rbac_analysis, network_policy_review, and runtime log triage in parallel.
• SBOM diff per service: one sub-agent per service in a monorepo release; parent aggregates the "newly-introduced CVEs" roll-up.

Reasoning Budget

Extended thinking pays off where the answer requires composing many small facts into an attack path or risk decision; it does not help when running a scanner and reporting output verbatim.

Multimodal Hooks

• Image layer histograms — attach Syft/Dive output screenshots to evidence for bloat/secret-layer findings.
• RBAC graphs — rbac-tool viz produces graphviz; render as PNG and embed in report for stakeholder clarity.
• Falco/Tetragon alert screenshots — useful for runtime-detection evidence bundles.

Structured Output

All findings MUST conform to schemas/finding.json.

Container-security-specific fields: affected.image_digest, affected.image_tag, affected.cluster_name, affected.namespace, affected.resource_kind, affected.service_account, cve, cvss, fixed_version, cis_control, and the sbom_diff block for diff findings.

Workflow Index

Payloads Index

References Index

Examples Index

Templates Index

Tools

Last Validated

2026-04. Minimum tool versions: Trivy 0.59, Grype 0.87, Syft 1.18, Kubescape 3.0, kube-bench 0.10 (CIS K8s v1.9), Falco 0.38, Tetragon 1.2, Hadolint 2.12, Cosign 2.4.