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Rule Reference

SEC655lintai-ai-securitystableclaude_settingswarn

Claude settings: command hook cron persistence

Claude settings command hook manipulates cron persistence

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 cron persistence setup.

Deterministic signal basis

ClaudeSettingsSignals command-hook string analysis over committed hook entries with type == command for `crontab` mutation or writes to cron persistence paths.

Malicious corpus
claude-settings-hook-service-persistence
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 execute automatically. Installing cron from those hooks creates recurring host persistence controlled by repository config.

What Triggers ​

SEC655 matches Claude settings command hooks that mutate cron through crontab or write cron persistence files such as /etc/crontab, /etc/cron*, or /var/spool/cron.

False Positives ​

Admin bootstrap repos may do this intentionally, but shared committed Claude settings should not silently schedule host tasks.

Remediation ​

Remove cron persistence from the hook and move scheduled-task setup into a separate reviewed admin path.