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Informational 20 Bitcoin

feat(common): introduce DebugLink-based N4W1 emulator messages

Public commit record

What the developer wrote

Authored by Roman Zeyde

62/100 · Adequate
feat(common): introduce DebugLink-based N4W1 emulator messages

[no changelog]
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope! No meaningful explanatory body
The short version

What changed, and why it matters

This commit only adds new message definitions for a debug-only feature called N4W1 emulator. It does not change any firmware logic, cryptographic code, or user-facing behavior. The messages are marked as DebugLink traffic, which is intended for testing and emulator use, not for production devices. There is no direct security vulnerability visible in this change, but adding debug interfaces always slightly increases the attack surface if those interfaces are accidentally reachable in production.

Recommended action

Treat this as a low-signal infrastructure change. When the corresponding handler implementation is committed, review it carefully for authorization, input validation, and whether the interface can be reached outside emulator/debug builds. Ensure DebugLink is disabled in release firmware and that these messages cannot be used to read or modify security-relevant storage.

Security signals we found

01

New DebugLink message types added to the wire protocol

02

Messages allow read/write/delete-like operations on key-value pairs over debug channel

03

Legacy firmware build explicitly skips these messages

04

No implementation of handlers or authorization checks present in this commit

05

DebugLink interfaces are generally disabled on production hardware

Risk score

Why this scored 20/100

Our methodology →
Potential impact 2/30
Exploitability 2/25
Stealth signal 3/15
Affected reach 3/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

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