fix: backport security fixes from app-version branch#24
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Security improvements:
- FireblocksSigner: Add externalTxId for idempotency (prevents duplicate signing)
- FireblocksSigner: Replace fixed 3s poll with exponential backoff (3s→30s)
- FireblocksSigner: Add 30-minute timeout to prevent infinite polling
- concatSignature: Validate v ∈ {0,1} (reject invalid recovery IDs)
- concatSignature: Validate signature length (128 hex chars)
- concatSignature: Normalize high-S signatures via @noble/secp256k1
- validateAddress: Support multisig addresses (SM/SN prefixes)
- untilBurnHeightForCycles: Fix off-by-one error in cycle calculation
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Summary
Backports critical security fixes from the
app-versionbranch tomainto ensure both branches have consistent security hardening.Security Improvements
FireblocksSigner.ts:
externalTxIdparameter for idempotent signing requests (prevents duplicate transactions on retry)helpers.ts:
concatSignature: Validate recovery ID v ∈ {0, 1} (reject malformed signatures)concatSignature: Validate signature is exactly 128 hex charactersconcatSignature: Normalize high-S signatures via@noble/secp256k1for node compatibilityvalidateAddress: Support multisig addresses (SM prefix for mainnet, SN for testnet)untilBurnHeightForCycles: Fix off-by-one error in PoX cycle calculationTest Plan
Related
These fixes address issues identified in the June 2026 security review. See
CODE_REVIEW_COMPREHENSIVE_JUNE_2026.mdin the app repo for full details.