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Rule Reference

SEC718lintai-ai-securitystablejsonwarn

MCP config: microphone capture exfiltration

MCP configuration command captures and exfiltrates microphone audio

Provider
lintai-ai-security
Surface
json
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
mcpmembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Checks committed MCP launch paths for explicit microphone recording utilities combined with remote transfer behavior.

Deterministic signal basis

JsonSignals command-plus-args analysis over ArtifactKind::McpConfig 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`, combined with remote sinks such as `curl`, `wget`, `scp`, `rsync`, `nc`, or HTTP(S) endpoints.

Malicious corpus
mcp-command-device-capture-exfil
Benign corpus
mcp-safe-basic
structured evidence required remediation reviewed
Canonical note

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

Nearby Signals

Related Rules

SEC301MCP config: shell trampolineMCP configuration shells out through sh -c or bash -cjsonstable
SEC302Config: insecure HTTP endpointConfiguration contains an insecure http:// endpointjsonstable
SEC303MCP config: credential env passthroughMCP configuration passes through credential environment variablesjsonstable
SEC304Config: TLS verification disabledConfiguration disables TLS or certificate verificationjsonstable
SEC305Config: hardcoded auth materialConfiguration embeds static authentication material in a connection or auth valuejsonstable
SEC309Config: literal secrets in configConfiguration commits literal secret material in env, auth, or header valuesjsonstable

Why It Matters ​

Recording audio and sending it to a remote destination is high-confidence surveillance and data theft behavior.

What Triggers ​

SEC718 matches MCP commands 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, and also transmit data to remote sinks such as curl, wget, scp, rsync, nc, or HTTP(S) endpoints.

False Positives ​

Shared committed MCP launch paths should not record and transmit microphone data. Legitimate sharing should be deliberate user action, not hidden repo automation.

Remediation ​

Remove microphone capture and remote transfer behavior from the committed MCP launch path and keep captured audio local unless the user explicitly chooses to share it.