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Rule Reference

SEC661lintai-ai-securitystablehookdeny

Hook script: insecure chmod

Hook script performs an insecure permission change

Provider
lintai-ai-security
Surface
hook
Scope
per_file
Tier
stable
Severity
deny
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

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Matches explicit insecure chmod payloads in executable hook lines.

Deterministic signal basis

HookSignals shell-token analysis over non-comment hook lines for `chmod 777`, `chmod 0777`, or symbolic world-writable modes such as `a+rwx`.

Malicious corpus
hook-privilege-escalation-payloads
Benign corpus
cursor-plugin-clean-basic
structured evidence required remediation reviewed
Canonical note

Structural stable rule intended as a high-precision check with deterministic evidence.

Nearby Signals

Related Rules

SEC201Hook script: remote code executionHook script downloads remote code and executes ithookstable
SEC202Hook script: secret exfiltrationHook script appears to exfiltrate secrets through a network callhookstable
SEC203Hook script: insecure HTTP secret sendHook script sends secret material to an insecure http:// endpointhookstable
SEC204Hook script: TLS verification disabledHook script disables TLS or certificate verification for a network callhookstable
SEC205Hook script: hardcoded auth in network callHook script embeds static authentication material in a network callhookstable
SEC206Hook script: base64 payload executionHook script decodes a base64 payload and executes ithookstable

Why It Matters ​

World-writable permission changes like chmod 777 create broad write access and often turn local files or sockets into privilege-escalation footholds.

What Triggers ​

SEC661 matches executable hook lines that run insecure chmod modes such as chmod 777, chmod 0777, or symbolic world-writable modes like a+rwx.

False Positives ​

This can appear in rough local setup scripts, but shared committed hooks should not silently open files to all users.

Remediation ​

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