cloudflare / security-audit-skill

# security-audit
A coding-agent skill that turns your agent into a security auditor. It orchestrates isolated agents through reconnaissance, coverage-led hunting, candidate validation, structured output, independent record verification, and target-neutral reporting.
This is the skill that seeded Cloudflare's vulnerability discovery harness, described in Build your own vulnerability harness. The harness grew into a multi-stage, fleet-wide system; this skill is the single-repo starting point it evolved from.
## What it does
The skill runs a structured audit in six phases:
1. **Reconnaissance** -- map architecture, trust boundaries, input surfaces, prior evidence, and deterministic coverage in `architecture.md` and `coverage-ledger.json`.
2. **Coverage-led hunting** -- assign isolated hunters from ledger units, record their checks, and use coverage critics to find gaps.
3. **Candidate validation** -- give every unique candidate to a fresh verifier that tries to disprove it.
4. **Structured output** -- write `confirmed`, `needs_validation`, and `rejected` records to `findings.json` and validate them against `report-schema.json`.
5. **Independent record verification** -- fresh agents verify final source claims. Material replacements receive another independent verifier.
6. **Target-neutral reporting** -- derive `REPORT.md`, `FINDINGS-DETAIL.md`, and `NEEDS-VALIDATION.md` from the verified records and coverage ledger.
The parent runs `validate-coverage-ledger.cjs` after creating the ledger and after each later ledger update. It runs `validate-findings.cjs` in Phase 4 and again after every Phase 5 replacement.
The verdicts are distinct: `confirmed` has a complete source trace and bounded observed result, `needs_validation` has an exact unresolved fact and no severity, and `rejected` records a disproved candidate.
Multiple runs against the same repo are additive. The skill uses prior ledgers and findings to target gaps, revalidate changed source, and carry forward current-source evidence without treating stale or unresolved work as covered.
## Files
| File | Purpose |
|------|---------|
| `SKILL.md` | Setup, core principles, platform terminology, workflow overview, and audit anti-patterns |
| `RECONNAISSANCE.md` | Phase 1 reconnaissance prompts and synthesis instructions |
| `HUNTING.md` | Phase 2 orchestration, hunting methodology, and validation rules |
| `ATTACK-CLASSES.md` | Core, wildcard, and obvious-things attack prompts |
| `MEMORY-SAFETY-AND-BINARY.md` | Memory-safety, binary, and kernel hunting classes for native targets |
| `AI-AND-LLM.md` | Prompt-injection, agent/tool, and output-handling hunting classes for LLM-backed targets |
| `WEB-PROTOCOL-AND-AUTH.md` | HTTP request-framing, cache, and authentication-protocol hunting classes for HTTP-protocol and auth targets |
| `CLIENT-SIDE.md` | DOM-injection, messaging-trust, UI-redress, and prototype-pollution hunting classes for client-side/browser targets |
| `SUPPLY-CHAIN-AND-RELEASE.md` | Depe