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Informational 24 Bitcoin

feat(common): allow exporting unit serial number

Public commit record

What the developer wrote

Authored by Roman Zeyde

57/100 · Thin
feat(common): allow exporting unit serial number

[no changelog]
✓ 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 adds a new device message that lets a connected computer ask a Trezor hardware wallet for its unit serial number. The change only defines the message format across several programming languages and build files; it does not include the actual firmware code that reads or returns the serial number. Because the serial number is a low-sensitivity identifier and the real behavior is not shown, the direct security risk is small, but it slightly expands what an untrusted host can learn about the device without user approval.

Recommended action

Review the companion firmware commit that implements the GetSerialNumber handler to confirm the serial number is returned only after appropriate authorization, is sourced from a read-only factory region, and does not enable host-side tracking or downgrade attacks. Consider adding a changelog entry and documenting the privacy implications for users.

Security signals we found

01

New wire_in management message added without visible authorization logic

02

Device-unique identifier (serial number) exposed over USB/transport protocol

03

Legacy firmware explicitly skips the new messages, limiting scope on older devices

04

No changelog entry provided despite user-visible feature

Risk score

Why this scored 24/100

Our methodology →
Potential impact 2/30
Exploitability 3/25
Stealth signal 4/15
Affected reach 3/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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