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mrwulf
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The deployed consistency verifier implemented the RFC 9162 2.1.4.2 bit-navigation loop but its final return checked only the two reconstructed roots, omitting the terminal condition that the new-size navigation counter reach zero. That condition couples the consumed proof length to the claimed tree sizes; without it, a valid proof for one transition verifies under a lied (power-of-two) old size. Flagship: a valid 2->3 proof is accepted under the false claim 1->3 with the size-2 root. Fix: add `and sn == 0` to the final return. This is the corpus's Known Gap 14 (3,867 deployed-accepts-only cases in a pinned 73,573-case family, recorded in public log entry 13). It was found by the project's own differential harness; a post-appeal review round added a faithful RFC oracle as a third comparison, which showed the deployed verifier — not the mechanized model — was the one deviating from RFC 9162, and traced it to the missing terminal check. Scope: verify_consistency's only production caller is the consumer-side pin store, reached only behind a verified head signature. Generation is RFC-correct and unaffected; the live provider service does not run this verifier; the published standalone verify.py has no consistency verifier. An empirical search found 0 realizable pin-advance poisons against an honestly pinned consumer, consistent with Known Gap 14's non-claim. Verification: - New fail-first three-way regression test test_consistency_lied_size_three_way_agreement (deployed / recursive ConsRec model / independent faithful RFC 9162 transliteration) over the honest AND lied-size families; fails pre-fix, passes post-fix. - Historical differential tests (164,479 inclusion; 164,224 consistency) unchanged — the fix rejects nothing honest. - Full suite: 145 passed, 0 failed. Public log entry 13, the attested accumulator commit, and the IACR submission PDF are all unchanged. Vulnerable state tagged vulnerable/sn0-consistency-fd2f6ba. See docs/security-2026-07-23-consistency-terminal-check.md. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| .. | ||
| agent-native.md | ||
| cockpit.md | ||
| products.md | ||
| runbook-latch.md | ||
| security-2026-07-23-consistency-terminal-check.md | ||
| threat-model.md | ||
| warden-lab-manual.md | ||
| warden-lineup.html | ||