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Mike Tolkachev

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31 commits1 monitored projects11 candidates1 high-risk analyses
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Blockstream JadeBlockstream31 commits11 candidates1 high risk
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Informational 15 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

rpc: refactor app code to use getters with default values

This commit is a straightforward code cleanup that replaces verbose 'read this optional value, or leave the default' patterns with shorter helper functions that do the same thing. There is no change in behavior and no security issue visibl…

b6a07147by Mike Tolkachev+22−348 files
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Low 36 AI analysisMessage 74 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

build: annotate functions returning error codes to ensure they are checked

This commit is a preventive build-hardening change. It adds compiler annotations (WARN_UNUSED_RESULT) to many functions that return success/failure codes, so the compiler will warn if a caller ignores the result. The goal is to catch futur…

Compiler annotation added to enforce checking of error-returning functionsNo specific vulnerability fixed in the diffNo functional code changes or call-site fixes included
909a89aaby Mike Tolkachev+215−15225 files
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Low 42 AI analysisMessage 28 · Opaque
BS BlockstreamBlockstream Jade BitcoinHardware wallets

psbt: fix path size

This commit fixes a small but meaningful bug in how Jade, a hardware wallet, reads key paths from Bitcoin PSBT data. The code was passing the byte size of a buffer when it should have passed the number of 32-bit entries. Depending on how t…

Buffer-size semantic mismatch in security-critical PSBT parsingUse of sizeof() on uint32_t array where element count is expectedCode path involved in 2of3 multisig recovery key identification
9e0c3747by Mike Tolkachev+2−21 file
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Moderate 59 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

sign_psbt: add early reject on wrong genesis blockhash

This commit fixes a bug in the Blockstream Jade hardware wallet's PSBT (Partially Signed Bitcoin Transaction) signing code. Previously, when the transaction's genesis block hash did not match the expected network, the code set an error mes…

Missing return in error path allows execution to continue after validation failureCross-network genesis hash mismatch not enforced as a hard failurePSBT signing logic accepts mismatched network parameters
56e130b0by Mike Tolkachev+1−01 file
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Low 42 AI analysisMessage 45 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

main: fix error handling during PIN change

This commit fixes a bug in the PIN-change flow on Blockstream Jade hardware wallets. Previously, if re-encrypting the wallet keys with a new PIN failed, or if the user abandoned the PIN change, the code did not jump to cleanup as intended.…

Missing error-path control flow in cryptographic key handlingPotential use of stale or partially initialized key material after PIN-change failureCleanup bypass in sensitive authentication code path
64c30823by Mike Tolkachev+2−01 file
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Moderate 59 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

attestation: harden error handling of challenge signing

This commit fixes a bug in the Blockstream Jade hardware wallet's attestation signing process. Previously, if signing the attestation challenge failed, the device would send an error message but then continue running the rest of the functi…

Missing return after error path allows fall-through to success-path replyUninitialized output.ext_signature_len could leak stack data or cause undefined behaviorAttestation signing failure could result in sending an invalid attestation reply
ecc5871bby Mike Tolkachev+2−01 file
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Low 39 AI analysisMessage 50 · Thin
BS BlockstreamBlockstream Jade BitcoinHardware wallets

attestation: fix missing cleanup on failed efuse write

This commit fixes a small but real bug in the device attestation setup code for Blockstream Jade, a hardware crypto wallet. When a one-time programmable security fuse failed to burn, the code used to exit immediately without releasing memo…

Missing cleanup on error path in security-critical initializationResource leak on failed efuse writePotential inconsistent attestation state after partial initialization
d37d88b7by Mike Tolkachev+1−11 file
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Moderate 59 AI analysisMessage 77 · Adequate
BS BlockstreamBlockstream Jade BitcoinHardware wallets

wallet: fix unhandled wrong asset in wallet summaries

This commit fixes a bug in the Blockstream Jade hardware wallet where a function that tracks assets during transaction signing could fail silently. Previously, if an unexpected or wrong asset was encountered while building a summary of tra…

Unchecked return value from asset_summary_update() in signing pathPotential bypass of asset/balance validation during transaction signingWrong or unknown asset could be silently dropped from wallet summaries
b33cf02bby Mike Tolkachev+18−53 files
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Moderate 59 AI analysisMessage 85 · Strong
BS BlockstreamBlockstream Jade BitcoinHardware wallets

sign: update output logic, rename and document output flags for clarity

This commit reworks how a Blockstream Jade hardware wallet labels transaction outputs. The key change is that the 'change' flag is now only set when the output is also confirmed as belonging to the wallet ('is ours'). Previously, downstrea…

Change output flag now gated by wallet-ownership flagUI hides change outputs based on single bit with runtime assertionGreen 2of3 outputs no longer marked as change because not marked as wallet-owned
cf79a3aaby Mike Tolkachev+32−245 files
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High 72 AI analysisMessage 85 · Strong
BS BlockstreamBlockstream Jade BitcoinHardware wallets

sign_tx: suppress validation/change attribution for green 2of3 outputs

This update fixes a security gap in how Blockstream Jade signs Bitcoin transactions for a specific wallet type called Green 2of3. Previously, the device trusted the connected app to supply a recovery public key and might silently treat an …

Host-supplied recovery_xpub was trusted for change attributionChange output could be misattributed without user confirmationFix suppresses automatic validation for Green 2of3 outputs
0243f239by Mike Tolkachev+17−11 file
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