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Rule Reference

SEC670lintai-ai-securitystablejsonwarn

Plugin hook: insecure chmod

Plugin hook command performs an insecure permission change

Provider
lintai-ai-security
Surface
json
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
mcpmembership

Lifecycle

Stable Lifecycle Contract

State

stable_gated

Graduation rationale

Checks committed plugin hook command values for explicit insecure chmod payloads.

Deterministic signal basis

JsonSignals command-string analysis over ArtifactKind::CursorPluginHooks for `chmod 777`, `chmod 0777`, or symbolic world-writable modes such as `a+rwx`.

Malicious corpus
plugin-hook-command-privilege-escalation-payloads
Benign corpus
plugin-hook-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

SEC301MCP config: shell trampolineMCP configuration shells out through sh -c or bash -cjsonstable
SEC302Config: insecure HTTP endpointConfiguration contains an insecure http:// endpointjsonstable
SEC303MCP config: credential env passthroughMCP configuration passes through credential environment variablesjsonstable
SEC304Config: TLS verification disabledConfiguration disables TLS or certificate verificationjsonstable
SEC305Config: hardcoded auth materialConfiguration embeds static authentication material in a connection or auth valuejsonstable
SEC309Config: literal secrets in configConfiguration commits literal secret material in env, auth, or header valuesjsonstable

Why It Matters ​

Plugin hooks run automatically in installed tooling. Insecure chmod changes from those hooks can silently weaken host protections.

What Triggers ​

SEC670 matches plugin hook command strings that run insecure chmod modes such as 777, 0777, or symbolic world-writable modes like a+rwx.

False Positives ​

Setup-heavy plugins may do this intentionally, but it remains a risky host change that should not happen silently.

Remediation ​

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