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Low 36 Bitcoin

feat(common,core,python,tests): add support for StellarInvokeHostFunctionOp.

Public commit record

What the developer wrote

Authored by Jun Luo

72/100 · Adequate
feat(common,core,python,tests): add support for StellarInvokeHostFunctionOp.
✓ 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 support for signing Stellar Soroban smart-contract transactions on Trezor hardware wallets. It introduces new message types, on-device confirmation screens, and serialization logic for complex contract arguments and authorization trees. The change is a feature addition rather than a bug fix; it does not by itself fix a known vulnerability, but it does expand the attack surface of the Stellar signing flow and includes several security-relevant design choices (e.g., showing externally signed authorizations only on request).

Recommended action

Treat this as a high-touch feature addition requiring focused review of the Stellar operations layout and serialization code, especially the consistency between what is displayed and what is signed, handling of nested/recursive authorization trees, and canonical strkey validation. No immediate emergency response is indicated by the diff alone, but regression and fuzz testing of the new message types is warranted before release.

Security signals we found

01

New signing path for smart-contract operations with large, nested, user-supplied data structures

02

UI formatting logic explicitly tries to prevent delimiter forgery in displayed SCV_STRING/SYMBOL values

03

Authorization entries with ADDRESS credentials are not shown by default; user must opt in

04

Strkey decoder now enforces canonical base32 encoding, checksum, payload length, and version

05

Soroban operation constrained to be single operation, no memo, ext.v=1

06

soroban_data is passed through as opaque bytes and committed only via signed digest

Risk score

Why this scored 36/100

Our methodology →
Potential impact 8/30
Exploitability 6/25
Stealth signal 4/15
Affected reach 7/15
Confidence 7/10
Evidence quality 4/5
Human-validated context

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