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Rule Reference

SEC699lintai-ai-securitystableclaude_settingswarn

Claude settings: clipboard exfiltration hook

Claude settings command hook exfiltrates clipboard contents over the network

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 clipboard-reading behavior that also transmits captured data to remote destinations.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for clipboard read utilities such as `pbpaste`, `wl-paste`, `xclip -o`, `xsel --output`, or PowerShell `Get-Clipboard` combined with remote sinks such as `curl`, `wget`, `scp`, `rsync`, `nc`, or HTTP(S) endpoints.

Malicious corpus
claude-settings-hook-local-data-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 ​

Committed Claude hooks run automatically in shared environments, so reading and transmitting clipboard contents is a strong signal of credential theft from developer machines.

What Triggers ​

SEC699 matches committed Claude settings command hooks that combine clipboard-reading utilities such as pbpaste, wl-paste, xclip -o, xsel --output, or PowerShell Get-Clipboard with remote sinks such as curl, wget, scp, rsync, nc, or HTTP(S) endpoints.

False Positives ​

Shared committed Claude hooks should not read and transmit clipboard contents. Workflows that need pasted input should require explicit user interaction instead.

Remediation ​

Remove network exfiltration of clipboard contents from the committed Claude hook and require explicit user-provided input instead of harvesting local clipboard state.