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Andrew Kozlik

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70 commits1 monitored projects24 candidates0 high-risk analyses
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Trezor firmwareTrezor70 commits24 candidates0 high risk
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Low 33 AI analysisMessage 67 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(python/trezorlib): enable entropy check on T1 by default

This commit changes the Trezor Python library so that, when setting up a Trezor Model One (the original Trezor 1 device), it now performs an entropy check by default if the device runs firmware 1.13.1 or newer. Previously, the library only…

Enables a previously disabled security/validation feature (entropy check) for a specific device modelAdds version-gated behavior to avoid errors on older firmwareDefensive hardening of wallet setup randomness verification
a4af9107by Andrew Kozlik+10−42 files
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Informational 21 AI analysisMessage 62 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

feat(core): Add MCU device attestation with ML-DSA-44.

This commit adds a new hardware-based device authentication feature for the Trezor T3W1 model. It lets the device prove its identity using a cryptographic certificate and signing key stored in the microcontroller (MCU). The change is a fea…

New secure-world signing primitive added behind USE_MCU_ATTESTATION compile flagAttestation seed derived from SECRET_PRIVILEGED_MASTER_KEY_SLOT via secret_key_derive_symSMCALL/SYSCALL verifiers check read/write access before passing pointers to secure world
f2eaa651by Andrew Kozlik+582−430 files
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Moderate 59 AI analysisMessage 77 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(legacy): Enforce matrix recovery for mnemonics under 24 words.

This update changes how older Trezor devices (the 'legacy' models) restore a wallet from a recovery phrase. Previously, users could type in each word directly in order ('ScrambledWords'). Now, for phrases shorter than 24 words, the device …

Enforcement of matrix-based recovery for shorter mnemonicsScrambledWords recovery restricted to 24-word mnemonics under strict safety checksNew failure path in recovery_init for disallowed input method
3b0cf662by Andrew Kozlik+53−167 files
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Moderate 68 AI analysisMessage 77 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(crypto): Avoid caching uncacheable nodes in bip32.c

This commit fixes a memory corruption bug in the code that caches Bitcoin-style key derivation paths inside Trezor's cryptographic library. When a derivation path was too deep to be cached, the code could store the derived key under the wr…

Memory corruption / cache key mismatch in BIP32 derivation cachePossible return of incorrect private key for a requested derivation pathRegression test explicitly labels the issue as a 'memory corruption bug'
26914ff4by Andrew Kozlik+33−22 files
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Low 45 AI analysisMessage 67 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

feat(python): Ensure that Trezor provides Tropic signature when expected.

This commit tightens device authentication checks in Trezor's Python library. Previously, if a hardware wallet returned a Tropic signature, it was verified. Now, the library also raises an error if a Tropic signature is expected (because a…

Missing-signature bypass preventedAuthentication/attestation logic changeDevice authenticity check strengthened
7dec396cby Andrew Kozlik+8−11 file
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Low 42 AI analysisMessage 57 · Thin
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(legacy): Avoid creation of zero-length VLA.

This commit fixes a coding issue in the older Trezor firmware where a temporary memory buffer could be created with zero size when handling multi-signature Bitcoin wallets. The fix replaces a variable-length buffer with a fixed maximum-siz…

Zero-length variable-length array (VLA) removedMagic number 15 replaced with named constant MAX_MULTISIG_PUBKEY_COUNTBuffer sizing moved from runtime variable to compile-time maximum
2f3e9aa6by Andrew Kozlik+8−71 file
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Moderate 59 AI analysisMessage 57 · Thin
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(legacy): Improve handling of value overflows.

This commit fixes several numeric overflow bugs in the older Trezor One (legacy) firmware. The most user-visible issue was a fee-rate display overflow: when a transaction used extremely large input amounts, multiplying the fee by 100 to sh…

Integer overflow in fee-rate computation could misrepresent transaction fees on device screenBIP-32 depth overflow guard prevents pathological key derivation edge caseNEM mosaic quantity overflow now returns failure instead of silently wrapping
ea542943by Andrew Kozlik+77−108 files
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Low 37 AI analysisMessage 67 · Adequate
TZ TrezorTrezor firmware BitcoinHardware wallets

fix(legacy): Improve handling of busy deadline overflow.

This commit fixes a subtle arithmetic bug in older Trezor hardware wallets related to how a 'busy' screen timeout is calculated. The old code added a delay value to the current time and compared it directly, which could misbehave when the …

Integer overflow/wraparound in timeout deadline calculationBehavioral change in device busy-state reporting and screen selectionRefactoring of global mutable state into accessor functions
adaa63f9by Andrew Kozlik+21−104 files
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