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Informational 17 Bitcoin

chore(core): add testing MCU attestation certificate

Public commit record

What the developer wrote

Authored by Ondřej Vejpustek

72/100 · Adequate
chore(core): add testing MCU attestation certificate

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

What changed, and why it matters

This commit adds a test-only digital certificate for the T3W1 hardware emulator. It is explicitly labeled as a testing certificate for emulators, lives in a 'unix' emulator directory, and is not used in real Trezor devices. There is no direct evidence it introduces a security vulnerability, but shipping test credentials in source code always deserves a quick check that they cannot accidentally be enabled in production firmware.

Recommended action

Verify that the 'unix' emulator certificate is excluded from production device builds (e.g., by build-system guards or separate source sets). Confirm the disclosed root seed is not used for any production attestation. No immediate patch is required if these conditions hold.

Security signals we found

01

Test-only certificate material added to emulator path

02

README explicitly states 'Certificate chains for emulators'

03

Root ML-DSA seed is disclosed in README as a known test value

04

No production firmware code or real device secrets changed

05

Certificate uses modern post-quantum ML-DSA (OID 2.16.840.1.101.3.4.3.17)

Risk score

Why this scored 17/100

Our methodology →
Potential impact 2/30
Exploitability 1/25
Stealth signal 1/15
Affected reach 2/15
Confidence 8/10
Evidence quality 3/5
Human-validated context

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