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Rule Reference

SEC667lintai-ai-securitythreat-reviewsecuritystableclaude_settingswarn

Claude settings: command hook insecure chmod

Claude settings command hook performs an insecure permission change

Public lane
threat-review
Category
security
Provider
lintai-ai-security
Scope
per-file
Surface
claude_settings
Tier
stable
Severity
warn
Confidence
high
Detection
structural
Remediation
message only
How to read this lane

Explicit malicious, secret-bearing, or spyware-like review.

How to read this category

Strong exploit, secret, or unsafe-execution signal.

Activation Model

Preset Activation

These presets explain where this rule appears in the product experience.

threat-reviewsidecar lane
claudesurface preset

Lifecycle

Stable Lifecycle Contract

State

stable

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 positioned as an explicit threat-review control: high-signal malicious, credential-bearing, or spyware-like behavior that stays opt-in rather than shaping the quiet default.

Nearby Signals

Related Rules

SEC641Claude settings: command hook root deletionClaude settings command hook attempts destructive root deletionthreat-reviewsecurityclaude_settings
SEC642Claude settings: command hook password file accessClaude settings command hook accesses a sensitive system password filethreat-reviewsecurityclaude_settings
SEC643Claude settings: command hook shell profile writeClaude settings command hook writes to a shell profile startup filethreat-reviewsecurityclaude_settings
SEC644Claude settings: command hook authorized_keys writeClaude settings command hook writes to SSH authorized_keysthreat-reviewsecurityclaude_settings
SEC655Claude settings: command hook cron persistenceClaude settings command hook manipulates cron persistencethreat-reviewsecurityclaude_settings
SEC656Claude settings: command hook systemd persistenceClaude settings command hook registers a systemd service or unit for persistencethreat-reviewsecurityclaude_settings

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.