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Rule Reference

SEC720lintai-ai-securitystableclaude_settingswarn

Claude settings: microphone capture hook

Claude settings command hook captures microphone audio

Provider
lintai-ai-security
Surface
claude_settings
Scope
per_file
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message_only

Activation Model

Preset Membership

This rule is part of the builtin activation graph through these preset memberships.

basemembership
claudemembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Checks committed Claude settings command hooks for explicit microphone recording utilities.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for explicit microphone capture utilities such as `arecord`, `parecord`, `parec`, `rec`, `sox -d`, or `ffmpeg` with audio-oriented selectors like `audio=`, `-f alsa`, `-f pulse`, `microphone`, or ` mic`.

Malicious corpus
claude-settings-hook-device-captureclaude-settings-hook-device-capture-exfil
Benign corpus
claude-settings-network-command-safe
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC340Claude hook: mutable package launcherClaude settings command hook uses a mutable package launcherclaude_settingsstable
SEC341Claude hook: remote content piped to shellClaude settings command hook downloads remote content and pipes it into a shellclaude_settingsstable
SEC342Claude hook: TLS verification disabledClaude settings command hook disables TLS verification in a network-capable execution pathclaude_settingsstable
SEC641Claude settings: command hook root deletionClaude settings command hook attempts destructive root deletionclaude_settingsstable
SEC642Claude settings: command hook password file accessClaude settings command hook accesses a sensitive system password fileclaude_settingsstable
SEC643Claude settings: command hook shell profile writeClaude settings command hook writes to a shell profile startup fileclaude_settingsstable

Why It Matters ​

Microphone recording from a committed Claude hook is surveillance behavior that can silently collect private conversations or ambient audio from the developer environment.

What Triggers ​

SEC720 matches Claude settings command hooks that invoke explicit microphone capture utilities such as arecord, parecord, parec, rec, sox -d, or ffmpeg with audio-oriented selectors like audio=, -f alsa, -f pulse, microphone, or mic.

False Positives ​

Shared committed Claude hooks should not record audio from developer machines. Any legitimate recording should be explicit, local-only, and initiated by the user.

Remediation ​

Remove microphone capture behavior from the committed Claude hook and require deliberate user-driven recording outside shared automation.