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Moderate 61 Bitcoin

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Public commit record

What the developer wrote

Authored by ww3512687

28/100 · Opaque
review account info
✓ Subject identifies a change! No meaningful explanatory body! Opaque security-relevant change
The short version

What changed, and why it matters

This commit is a security-focused code review and hardening pass on account and secret handling in the Keystone 3 hardware wallet firmware. It replaces unsafe string and memory functions (strcpy, sprintf, memcpy) with safer bounded versions, removes debug printf leaks of sensitive data, fixes a bug where a new-password cache overwrote the password cache, adds compile-time guards against shipping test keys in production, and hardens JSON parsing against malformed flash data. These are defensive improvements that reduce the risk of buffer overflows, information leaks, and accidental weakening of secure-element protections.

Recommended action

Treat this commit as a security hardening patch. Review the new helper functions for correct bounds handling, verify that production builds do not define ATECC608B_TEST_MODE or DS28S60_TEST_MODE, and ensure the removed debug prints do not leave other logging sites that leak secrets. Consider running static analysis and targeted fuzzing on the JSON parsing and xpub derivation paths.

Security signals we found

01

Replacement of strcpy/sprintf/memcpy with bounded strncpy_s/snprintf_s/memcpy_s across secret and account code

02

Removal of printf debug statements that printed xpubs, wallet config, mnemonics, and JSON secrets to UART/log

03

Secure zeroization of cached passwords, passphrases, entropy, EMS, and mnemonics before freeing

04

Fix of SecretCacheSetNewPassword assigning to g_passwordCache instead of g_newPasswordCache

05

Compile-time #error preventing ATECC608B/DS28S60 test-mode keys in PRODUCTION_BUILD

06

Null/length checks added to JSON parsing and flash read/write paths

07

Bounds check added to SLIP39 mnemonic cache index

08

Fix of GetPassphrase returning bool false instead of NULL for invalid account index

09

Refactoring of xpub derivation to reduce duplicated conditional code paths

Risk score

Why this scored 61/100

Our methodology →
Potential impact 18/30
Exploitability 12/25
Stealth signal 8/15
Affected reach 12/15
Confidence 7/10
Evidence quality 4/5
Human-validated context

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