S21 = devil's-advocate blind spot #2 (security/safety), operator scope
"security-core": fix genuine defects, honestly record the rest.
SSRF fix (CWE-918). validateOtlpEndpoint classified the host by literal
string match. Decimal/hex/octal/trailing-dot encodings are already caught
(the WHATWG URL parser canonicalizes them), but IPv4-mapped IPv6 literals
(::ffff:127.0.0.1, ::ffff:192.168.x, ::ffff:169.254.169.254) render as
::ffff:HHHH:HHHH and matched neither the loopback set, the RFC-1918 regex,
link-local, nor HARD_BLOCKED_HOSTS — they passed over https and would reach
loopback / private / cloud-metadata, defeating the comment's "PERMANENTLY
block metadata" promise. Added mappedV4() to decode the embedded IPv4
(dotted + hex-pair forms) and classify on it. TDD: 4 tests failing-first —
mapped loopback/RFC-1918/metadata rejected (metadata stays HARD_BLOCKED even
with VOYAGE_OTEL_ALLOW_PRIVATE=1), mapped public ::ffff:8.8.8.8 still valid
(no over-block). Threat model narrow (endpoint is operator-set env; export
opt-in; a brief cannot set env).
Survivor #18 honest-residual. T2-bakeoff §3 "Classifier interference: 0"
read as satisfied, but the auto/bypass-mode re-run that matters for headless
trekreview was never run (mode is operator-set, not settable in-session) —
footnoted, not gating. Per recommendation #9, moved to an OPEN RESIDUAL
(untested), guarded by a new doc-consistency pin.
Audit record. ## S21 resolution block in devils-advocate-results.md
dispositions all four sub-questions: SSRF (fixed), hooks-block (verified;
advisory-rail residuals: Write-only matcher, Bash-redirect, regex gaps — by
design), malicious-brief-headless (catastrophe-blocked, exfil NOT blocked —
inherent limit). S21b flagged (NOT done): operations.md:15 mis-describes
autonomy-gate.mjs state machine + --gates table.
Test count: real baseline 700 (698 pass / 2 skip), NOT 715 — the node:test
headline carried in S20 commit msgs was stale/miscounted (census figures
were correct). Now 705 (703 pass / 2 skip / 0 fail); census behavior
601->605, doc-pins 71->72, total 672->677.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LqBYc8Ltrk7LipyJmGxXiB
Found by simulert v4.1 smoke — doc/code-drift in v4.1 ship:
docs/observability.md claims "Cloud metadata endpoints (169.254.169.254)
are permanently blocked" but the validator allowed them when
VOYAGE_OTEL_ALLOW_PRIVATE=1. Cloud metadata services expose IAM
credentials and instance secrets — operator-trust extended to
RFC-1918 home-lab access does NOT extend here, because the
blast-radius (cloud-account compromise) is qualitatively different.
New HARD_BLOCKED_HOSTS set checked BEFORE the link-local opt-in path:
- 169.254.169.254 (AWS / GCP / Azure metadata)
- 100.100.100.200 (AliCloud metadata)
- metadata.google.internal
- metadata.azure.com
New error code ENDPOINT_HARD_BLOCKED. Existing test for
ENDPOINT_LINK_LOCAL_REJECTED on 169.254.169.254 updated to assert
the new code; 3 new tests verify the hard-block holds even with
VOYAGE_OTEL_ALLOW_PRIVATE=1, plus AliCloud + GCP-hostname coverage.
Tests: 487 → 490 pass + 2 skipped.
