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Informational 24 Bitcoin

feat(core): add trezorctl set-log-filter command

Public commit record

What the developer wrote

Authored by cepetr

57/100 · Thin
feat(core): add trezorctl set-log-filter command

[no changelog]
✓ 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 developer-only command, `trezorctl set-log-filter`, that lets someone with physical debug access to a Trezor device change which internal log messages are printed. It only works when the device was built with a special debug-console feature enabled, and it does not change how ordinary user operations work. There is no direct evidence in the commit that this creates a security vulnerability, but any new debug command slightly increases the attack surface available to someone who already has debug access.

Recommended action

Treat this as a low-risk debug-infrastructure change. If reviewing for release, verify that production firmware builds do not define `USE_DBG_CONSOLE`, confirm that `syslog_set_filter()` safely handles arbitrary filter strings (length, null termination, format-string safety), and ensure the debug transport remains inaccessible to untrusted hosts.

Security signals we found

01

New debug-only wire message added to the protocol surface

02

User-supplied string passed from protobuf into a C syslog filter function

03

Handler is gated by USE_DBG_CONSOLE compile-time flag and __debug__ runtime guard

04

Legacy firmware build explicitly excludes the new message

05

No input sanitization or length checks visible in the diff

Risk score

Why this scored 24/100

Our methodology →
Potential impact 2/30
Exploitability 3/25
Stealth signal 4/15
Affected reach 3/15
Confidence 8/10
Evidence quality 4/5
Human-validated context

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