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Rule Reference

SEC667lintai-ai-securitystableclaude_settingswarn

Claude settings: command hook insecure chmod

Claude settings command hook performs an insecure permission change

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 insecure chmod payloads.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for `chmod 777`, `chmod 0777`, or symbolic world-writable modes such as `a+rwx`.

Malicious corpus
claude-settings-hook-privilege-escalation-payloads
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 ​

Shared Claude hooks execute automatically. Running chmod 777-style commands from them can quietly weaken host file protections.

What Triggers ​

SEC667 matches Claude settings command hooks that run insecure chmod modes such as 777, 0777, or symbolic world-writable modes like a+rwx.

False Positives ​

This can show up in rough setup hooks, but shared committed Claude settings should not silently widen host write access.

Remediation ​

Replace broad chmod modes with the minimum required permissions and keep risky host permission changes out of shared hooks.