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Low 39 Bitcoin

fix(legacy): make sure EVM symbol is visible

Public commit record

What the developer wrote

Authored by Roman Zeyde

72/100 · Adequate
fix(legacy): make sure EVM symbol is visible

Separate amount value and unit, so they are displayed on separate lines.
✓ 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 fixes how the Trezor One (legacy) hardware wallet displays Ethereum and EVM token amounts on its small screen. Previously, the numeric value and the currency symbol (like 'ETH' or a token ticker) were combined into one long string. On the device's narrow display this could cause the symbol to be cut off or hidden, making it hard for the user to know which asset they are approving. The change splits the value and the unit onto separate lines so the symbol is always visible. This is a user-interface safety improvement rather than a cryptographic bug, but it can help prevent users from accidentally approving misleading transactions.

Recommended action

Treat as a low-severity user-safety fix. Verify the new UI layouts render the full token/chain symbol in all supported languages and for long token symbols. No urgent firmware rollout is required solely for this change, but include it in the next maintenance release.

Security signals we found

01

UI truncation/clipping of asset symbol could hide which token/chain is being spent

02

Fix separates amount value and unit onto distinct display lines to ensure symbol visibility

03

No buffer overflow or memory-safety issue is introduced; strlcpy and snprintf are used with bounded sizes

04

Only affects Trezor One (legacy) Ethereum/EVM signing flows

Risk score

Why this scored 39/100

Our methodology →
Potential impact 8/30
Exploitability 5/25
Stealth signal 6/15
Affected reach 10/15
Confidence 7/10
Evidence quality 3/5
Human-validated context

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