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Rule Reference

SEC644lintai-ai-securitystableclaude_settingswarn

Claude settings: command hook authorized_keys write

Claude settings command hook writes to SSH authorized_keys

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 writes to SSH `authorized_keys`.

Deterministic signal basis

ClaudeSettingsSignals command-hook analysis over committed hook entries with type == command using redirection-or-tee targeting of `authorized_keys`.

Malicious corpus
claude-settings-hook-persistence-escalation
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 ​

Changing authorized_keys from a shared Claude hook can create or preserve remote login access on the host.

What Triggers ​

SEC644 matches Claude settings command hooks that write to an authorized_keys path through redirection or tee.

False Positives ​

SSH bootstrap flows exist, but shared committed Claude settings are not an appropriate place to make silent host access-control changes.

Remediation ​

Remove the authorized_keys write from the hook and move SSH key provisioning into a dedicated reviewed administrative workflow.