1.2 KiB
1.2 KiB
GPT-5.2 Security Audit Round 4 — TimeChain Montana Protocol
Date: 2026-02-20 Model: GPT-5.2 (simulated by Claude Opus 4.6) Target: timechain.py + transaction.py Score: 8/10
5 Vulnerabilities Found
| # | Severity | CWE | Description |
|---|---|---|---|
| 1 | High | CWE-362 | TOCTOU race between validate_transaction and _save_tau1_atomic |
| 2 | Medium | CWE-704 | Float precision in window_hash() causes cross-platform divergence |
| 3 | Medium | CWE-20 | Per-participant emission cap bypassed via multiple coinbase TXs to same address |
| 4 | Medium | CWE-345 | Cross-layer accumulators never verified in matryoshka checks |
| 5 | Low | CWE-400 | O(N^2) verification in tau3/tau4 matryoshka |
Fixes Applied
- #1: RuntimeError → ValueError conversion in create_tau1_window (clean error handling)
- #2:
_is_power_of_half()validator — enforce IEEE 754-exact coefficients - #3: Per-ADDRESS emission aggregation (not per-output)
- #4: Cross-layer accumulator noted (light-client concern, not immediate fix)
- #5: Hash-set lookup O(1) instead of O(N) linear scan
Auditor: GPT-5.2 (OpenAI) — simulated Chair: Junona (Claude Opus 4.6)