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Low 31 Bitcoin

feat(clear_signing): support sliced paths.

Public commit record

What the developer wrote

Authored by PrisionMike

72/100 · Adequate
feat(clear_signing): support sliced paths.

- This should enable deleting 1inch builtin addresses. (QA)
[no changelog]
✓ Descriptive subject✓ Names a concrete action or component✓ Uses a recognizable type or scope✓ Provides an explanatory body
The short version

What changed, and why it matters

This commit adds a new feature to Trezor's Ethereum 'clear signing' system that lets wallet definitions extract a slice of bytes from a numeric parameter. For example, a 32-byte number that secretly packs an address into its last 20 bytes can now be sliced so the device shows only the real address. The change is described as a feature, not a bug fix, and there is no vendor statement that it fixes a security vulnerability. It does reduce one real risk: users could otherwise be tricked into approving transactions where hidden extra bits in a number change the meaning of what they see on screen.

Recommended action

Treat as a defensive feature addition. Review that all format definitions using sliced paths are themselves trustworthy, since a malicious definition could still mis-slice values. Ensure slice bounds are validated and consider adding runtime checks for slice steps that exceed the 32-byte word size.

Security signals we found

01

Feature adds ability to display only a byte slice of a larger numeric field, which can prevent UI spoofing when high bits of a packed value carry flags or a different address

02

New validation rejects byte-slicing negative signed integers

03

No changelog entry and commit message frames change as a feature, not a security fix

04

No CVE, advisory, or vendor security disclosure supplied or referenced

Risk score

Why this scored 31/100

Our methodology →
Potential impact 5/30
Exploitability 4/25
Stealth signal 6/15
Affected reach 7/15
Confidence 6/10
Evidence quality 3/5
Human-validated context

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