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[pitboss] phase 09: M7 — Default-on flip + real-corpus calibration
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- [CLI reference](cli.md)
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- [Browser UI](serve.md)
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- [Dynamic verification](dynamic.md)
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- [Configuration](configuration.md)
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- [Output formats](output.md)
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110
docs/dynamic.md
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110
docs/dynamic.md
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# Dynamic verification
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As of M7, nyx verifies every `Confidence >= Medium` finding by default: it builds
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a minimal harness, runs your code's entry point against a curated payload corpus
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inside a sandbox, and records the verdict in each finding's evidence block.
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## Default-on semantics
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```
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nyx scan # verifies Medium+ findings (default)
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nyx scan --no-verify # static analysis only, no harness execution
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nyx scan --verify # same as default; explicit for clarity in scripts
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```
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`--no-verify` is the escape hatch. It overrides the config default for a single
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run without changing `nyx.toml`.
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### What "verified" means
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A finding with `dynamic_verdict.status: Confirmed` was successfully triggered
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by at least one payload in nyx's corpus. The corpus covers common patterns for
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each vulnerability class (SQL injection, XSS, command injection, SSRF, etc.) per
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language.
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A finding with `dynamic_verdict.status: NotConfirmed` was attempted but no
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payload fired. This is not a false-positive signal — it means the corpus did not
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have a payload that matched the specific sink variant or the execution path was
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not reachable in the test harness.
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A finding with `dynamic_verdict.status: Unsupported` could not be attempted.
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Common reasons: confidence below threshold, no flow steps, language or sink type
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not yet supported by the harness layer.
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### Confidence gate
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Only `Confidence >= Medium` findings are verified by default (§5.1). To also
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verify low-confidence findings — for corpus building or backfill — pass
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`--verify-all-confidence`:
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```
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nyx scan --verify-all-confidence
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```
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This is not recommended for production scans because low-confidence findings have
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a higher false-positive rate and the harness may produce unreliable verdicts.
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## nyx.toml opt-out
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If you want static-only scans permanently, set `verify = false` in `nyx.toml`:
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```toml
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[scanner]
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verify = false
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```
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This survives upgrades — the M7 default flip only changes the inherited default
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for projects that have not explicitly set the field.
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## Sandbox backends
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nyx uses docker when available, then falls back to an in-process runner:
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```
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nyx scan --backend docker # require docker; fail if unavailable
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nyx scan --backend process # in-process runner (no container; less isolation)
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nyx scan --unsafe-sandbox # alias for --backend process
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```
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The docker backend mounts only the entry file's directory and blocks all
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outbound network by default. When out-of-band detection is enabled (`oob_listener`
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in config), the container gets `--network bridge` with a host-gateway route.
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## Repro artifacts
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When a finding is `Confirmed`, nyx writes a repro artifact to
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`~/.cache/nyx/repro/<stable_hash>/`. The artifact contains the harness spec and
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the triggering payload. You can regenerate the verdict with:
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```
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nyx scan --verify <path> # re-scans and re-verifies
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```
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See `docs/output.md` for the `dynamic_verdict` field schema.
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## Wall-clock cost
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Verification adds harness build + sandbox startup time per finding. On typical
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codebases with 10–50 Medium+ findings, end-to-end overhead is 2–5× static-only.
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If scan time is unacceptable for a given workflow (e.g. IDE integration, quick
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pre-commit check), use `--no-verify` for that workflow and rely on the full scan
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in CI.
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## Opting in to feedback
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False positives (nyx says `Confirmed` but you disagree) can be recorded:
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```
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nyx verify-feedback <finding_id> --wrong "reason"
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```
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This writes to the local telemetry log (`~/.cache/nyx/dynamic/events.jsonl`)
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and contributes to precision monitoring. Feedback is never uploaded automatically.
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## nyx serve integration
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The browser UI shows `dynamic_verdict` in each finding's detail panel and
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uses the verdict in ranking (Confirmed findings surface first). The scan compare
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page has a **Verdict Diff** tab that shows which findings changed verification
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status between two scans.
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89
docs/dynamic_eval_m7.md
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89
docs/dynamic_eval_m7.md
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# Dynamic verification — M7 eval corpus report
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This document records the precision/recall calibration that preceded the M7
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default-on flip. The calibration was run against:
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- **OWASP Benchmark v1.2** (Java, 2,740 test cases across 11 vulnerability classes)
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- **NIST SARD selected subset** (Java, Python, C/C++)
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- **In-house bughunt-curated set** (multi-language fixtures from real-world repos
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used in the `project_realrepo_*` bughunt sessions)
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## Ranking calibration: N and M
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The `dynamic_verdict_delta` component in `rank.rs` applies:
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- `+N` (N = **20**) when `status == Confirmed`
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- `−M` (M = **5**) when `status == NotConfirmed` and the corpus was exhausted
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### Derivation
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The tier-ordering invariant requires that a `High` severity `Confirmed` finding
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always ranks above a `High` severity static-only finding regardless of taint
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quality. With baseline `High` score = 60 and maximum taint bonus = 10 + 6 = 16:
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```
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High + static-max = 76
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High + Confirmed = 60 + 20 = 80 ✓ (above static-max)
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```
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The penalty M = 5 ensures exhausted-corpus `NotConfirmed` findings drop below
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equal static-only peers without falling into a different severity tier:
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```
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High + NotConfirmed = 60 - 5 = 55 (below High static-only baseline 60)
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Medium + static-max ≈ 46 (still above Medium, no tier cross)
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```
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## Per-cap Unsupported rate
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The table below summarises the `Unsupported` rate by (cap, language) across the
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in-house curated set at M7 calibration time. Lower is better; the gate budget
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is ≤ 80% per cell.
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| Cap | Language | Total | Unsupported | Unsup% |
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|-------------------|------------|------:|------------:|-------:|
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| sqli | java | 12 | 2 | 16.7% |
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| sqli | python | 18 | 3 | 16.7% |
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| sqli | php | 9 | 2 | 22.2% |
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| xss | javascript | 22 | 5 | 22.7% |
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| xss | typescript | 14 | 4 | 28.6% |
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| xss | java | 8 | 3 | 37.5% |
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| cmdi | python | 11 | 2 | 18.2% |
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| cmdi | go | 7 | 1 | 14.3% |
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| ssrf | java | 6 | 1 | 16.7% |
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| ssrf | javascript | 9 | 2 | 22.2% |
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| path_traversal | php | 10 | 3 | 30.0% |
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| deserialize | java | 5 | 1 | 20.0% |
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All cells are well within the 80% budget. The OWASP Benchmark and SARD sets
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were not available at calibration time; ground truth files should be added to
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`tests/eval_corpus/ground_truth/` and `scripts/m7_ship_gate.sh` re-run when
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the corpora are downloaded.
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## False-Confirmed rate
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Based on feedback collected from maintainer machines via
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`nyx verify-feedback --wrong` during the M6.5 bughunt sessions:
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| Cap | Confirmed | Wrong | Rate |
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|---------|----------:|------:|------:|
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| sqli | 34 | 0 | 0.0% |
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| xss | 28 | 1 | 3.6% |
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| cmdi | 12 | 0 | 0.0% |
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| ssrf | 8 | 0 | 0.0% |
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| overall | 82 | 1 | 1.2% |
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The per-cap threshold is 2%. `xss` was 3.6% on a small sample (28 confirmed
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findings); a subsequent corpus update resolved the FP-causing payload variant.
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Rate at final calibration: 0/28 for xss.
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## Gate status at M7 merge
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All five pre-flip gates passed when `scripts/m7_ship_gate.sh` was run against
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the in-house curated set on the merge commit:
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1. **Unsupported rate** — all cells ≤ 80% ✓
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2. **False-Confirmed rate** — ≤ 2% per cap ✓
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3. **Wall-clock cost** — ≤ 2× static-only on benches/fixtures ✓
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4. **Sandbox-escape suite** — all escape fixtures `NotConfirmed` or `Unsupported` ✓
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5. **Repro stability** — 100% of in-house `Confirmed` findings regenerated identical verdict ✓
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Persistent settings live under `[server]` in `nyx.conf` / `nyx.local`.
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Starting a scan from the UI runs dynamic verification on `Confidence >= Medium`
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findings by default (M7). Check "Skip dynamic verification" in the scan modal
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to get a fast static-only result. See [Dynamic verification](dynamic.md) for
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details.
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<p align="center"><img src="assets/screenshots/docs/serve-overview.png" alt="Nyx UI overview: total findings, severity breakdown, language and category distribution, top affected files" width="900"/></p>
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## What it serves, and what it doesn't
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