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Moderate 64 Bitcoin

feat(ethereum): allow approve and transfer to send eth

Public commit record

What the developer wrote

Authored by PrisionMike

62/100 · Adequate
feat(ethereum): allow approve and transfer to send eth

[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 changes how Trezor devices display Ethereum transactions when someone sends ERC-20 token approval or transfer calls that also include native ETH. Previously, the device might not clearly show the attached ETH, so a user could unknowingly approve sending tokens plus real ETH. The patch makes the device surface that native ETH amount on the confirmation screen. It is a defensive fix that improves transparency rather than introducing a vulnerability.

Recommended action

Treat as a security-hardening UX fix. Verify that the native amount is clearly visible and not truncated on small screens, and that the new test vectors pass on all supported models. No immediate incident response is indicated, but users should be informed that prior firmware may have under-displayed ETH attached to token calls.

Security signals we found

01

UI display of previously hidden native ETH value in ERC-20 approve/transfer

02

New test fixtures explicitly for 'with_eth' combinations

03

Commentary in code states 'so it can't be signed unseen'

04

No signing or cryptography logic changed; only confirmation rendering

05

Applies to all current UI layout families

Risk score

Why this scored 64/100

Our methodology →
Potential impact 18/30
Exploitability 12/25
Stealth signal 8/15
Affected reach 14/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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