security-review

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• SKILL.md

SKILL.md (first lines)

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# Security Review

> **HARD GATE** — Requires git context (branch with merge-base or diff). Never
> writes files outside `specs/security/`. Findings below confidence 8/10 are
> suppressed. Pre-flight: `git rev-parse HEAD >/dev/null 2>&1`

## Parallel worktree mode (e45s18)

When running alongside `audit-code`, use isolated worktrees so scans do not race on the same index:

```bash
bash scripts/lib/parallel-review-worktrees.sh security-review
```

Each check gets a detached worktree at `.bigpowers/worktrees/review-<name>/`; reports still write only under `specs/security/`.

## 5-phase scan

| # | Phase | What |
|---|-------|------|
| 1 | **Scope Resolution** | Detect diff via `git diff --merge-base origin/HEAD`; resolve languages/frameworks from dependency files |
| 2 | **Context Research** | Identify existing security patterns, sanitization, auth model in the codebase |
| 3 | **Vulnerability Assessment** | Trace user input → sink; check auth boundaries, crypto, deserialization, path ops |
| 4 | **False-Positive Filtering** | Cross-check each finding against exclusion rules; reject confidence < 8 |
| 5 | **Report Generation** | Output structured markdown: file:line, severity, category, exploit scenario, fix |

## Categories

Covered: SQLi, XSS, SSRF, command injection, auth bypass, unsafe deserialization, path traversal, IDOR, crypto flaws, secrets exposure, template injection, NoSQLi

## CWE mapping mandate (e45s26)

Every **new detection rule** added to this skill MUST:

1. Map to a [CWE](https://cwe.mitre.org/) ID in `REFERENCE-vuln-categories.md` (e.g. SQLi → CWE-89, XSS → CWE-79).
2. Ship **two fixture pairs** under `skills/security-review/fixtures/`:
   - **Positive** — minimal code the rule MUST flag (vulnerable pattern present).
   - **Negative** — structurally similar code the rule MUST NOT flag (safe pattern / false-positive guard).

| Rule | CWE | Positive fixture | Negative fixture |
|------|-----|------------------|------------------|
| SQL injection | CWE-89 | `fixtures/CWE-89-sqli-positive.py` | `fixtures/CWE-89-sqli-negative.py` |
| XSS (DOM) | CWE-79 | `fixtures/CWE-79-xss-positive.js` | `fixtures/CWE-79-xss-negative.js` |
| Missing tenant scoping (IDOR) | CWE-639 | `fixtures/CWE-639-idor-positive.go` | `fixtures/CWE-639-idor-negative.go` |
| Fail-open verify directive | CWE-754 | `fixtures/CWE-fail-open-verify-positive.sh` | `fixtures/CWE-fail-open-verify-negative.sh` |

Before merging a new category, run both fixtures through the detection guidance and confirm positive flags / negative passes.

## SQL-safety doctrine (e45s41 — proven authorship)

Formal rule for SQL injection classification:

| SQL source | Attacker-reachable input? | Verdict |
|------------|---------------------------|---------|
| Hardcoded / compile-time constant string | N/A | **Safe** — proven authorship |
| Developer-authored query with bound parameters only | No dynamic fragments from user input | **Safe** |
| String concatenation / template with user-controlled values | Yes | **Unsafe** — report as SQLi |
| ORM query builder with user input in WHERE/JOIN | Yes | **Unsafe** unless parameterized |
| Stored procedure call with bound args | Args from trusted constants only | **Safe** |
| Stored procedure with dynamic SQL inside | User input reaches EXEC | **Unsafe** |

**Provenance test:** If the agent cannot prove the query string was authored entirely by the developer (no attacker-reachable interpolation), treat as vulnerable. Hardcoded SQL in migrations, seeds, and admin scripts is safe; anything reachable from HTTP/CLI/user input is not.

## BCP Plus Integration

This skill maps to **BCP Plus dimension 12 (Security & Compliance)**. When BCP Plus sizing is active, the threat model categories above correspond to sub-elements within dimension 12. The NFR Gate rule applies: standard-expectation items (e.g., "use HTTPS", "hash passwords") score 0 with a one-line rationale; only above-standard security requirements contribute to the dimension 12 count. See `docs/references/bcp-plus.md` for the full 13-dimension framework and NFR Gate pattern.

## Integration points

| Skill | Touchpoint |
|-------|------------|
| `build-epic` | Step 0 — threat-model epic scope → `specs/security/epics/<id>/THREAT_MODEL.md` |
| `plan-work` | `security:` field (none/low/medium/high) on story tasks |
| `plan-release` | +2 WSJF risk boost for HIGH+ risk epics |
| `audit-code` | Checklist: "diff scanned — no unaddressed HIGH findings" |
| `request-review` | Inject threat model categories + false-positive rules into reviewer prompt |
| `investigate-bug` | Security-impact assessment in RCA (NONE→CRITICAL) |
| `validate-fix` | Recurrence hardening check for security bugs |
| `verify-work` | Phase 5 — blocks on HIGH findings ≥ 8 confidence |
| `release-branch` | Hard gate — blocks merge if unresolved HIGH findings |

## Report format

Each finding: **`File:Line` — Severity — Category**
- Description: how the vulnerability manifests
- Exploit scenario: concrete attack path
- Recommendation: fix with code example

## Reference files

- [Vuln categories](REFERENCE-vuln-categories.md) — detection guidance per vuln type
- [False positives](REFERENCE-false-positives.md) — hard exclusions + precedent
- [Confidence rubric](REFERENCE-confidence-rubric.md) — scoring methodology (0–10)

## Verify

→ verify: `test -d specs/security && test -f scripts/lib/parallel-review-worktrees.sh && bash scripts/verify-cwe-fixture-sync.sh >/dev/null && git rev-parse HEAD >/dev/null 2>&1`

---

# Confidence Scoring Rubric

Every finding that survives Phase 4 false-positive filtering receives a confidence
score from 1 (speculative) to 10 (certain). Only findings ≥ 8 are reported.

## Score 9–10: Certain Exploit Path

**Criteria:**

From danielvm-git/bigpowers, MIT.

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