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Low 33 Bitcoin

feat(core): generate SLIP-21 node for Evolu

Public commit record

What the developer wrote

Authored by obrusvit

57/100 · Thin
feat(core): generate SLIP-21 node for Evolu
✓ 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 Trezor feature that lets users derive a special cryptographic key (a SLIP-21 node) for a third-party storage framework called Evolu. The device will show an on-screen confirmation before releasing the key. It is a feature addition, not a fix for a known vulnerability. The main security consideration is that any host application able to send the new message type can request this key, but only after the user confirms on the device. The key is tied to a fixed path ("TREZOR"/"Evolu"), so it cannot be used to steal cryptocurrency directly, but if a user is tricked into approving it, the key could be leaked to a malicious application.

Recommended action

Review whether the new message type should be gated behind an application policy or session authorization beyond a single user confirmation. Verify that the confirm_action prompt cannot be silently approved by a compromised host or debuglink in production. Confirm that the fixed SLIP-21 path does not overlap with any other cryptographic usage. Treat this as a routine feature review rather than an incident response.

Security signals we found

01

New wire message type added to an existing privileged interface

02

User confirmation required before key derivation

03

Fixed SLIP-21 derivation path limits key scope

04

Legacy firmware skips the new messages, reducing attack surface on legacy devices

05

No input validation issues visible in the handler because the request message carries no fields

06

TODO comment indicates UI copy is not final

Risk score

Why this scored 33/100

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

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