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Rule Reference

SEC664lintai-ai-securitythreat-reviewsecuritystablejsonwarn

MCP config: insecure chmod

MCP configuration command performs an insecure permission change

Public lane
threat-review
Category
security
Provider
lintai-ai-security
Scope
per-file
Surface
json
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
mcpsurface preset

Lifecycle

Stable Lifecycle Contract

State

stable

Graduation rationale

Checks committed MCP launch paths for explicit insecure chmod payloads.

Deterministic signal basis

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

Malicious corpus
mcp-command-privilege-escalation-payloads
Benign corpus
mcp-safe-basic
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

SEC301MCP config: shell trampolineMCP configuration shells out through sh -c or bash -cthreat-reviewsecurityjson
SEC305Config: hardcoded auth materialConfiguration embeds static authentication material in a connection or auth valuethreat-reviewsecurityjson
SEC309Config: literal secrets in configConfiguration commits literal secret material in env, auth, or header valuesthreat-reviewsecurityjson
SEC310Config: metadata or private-network hostConfiguration endpoint targets a metadata or private-network host literalthreat-reviewsecurityjson
SEC338MCP config: sensitive host bind mountMCP configuration launches Docker with a bind mount of sensitive host materialthreat-reviewsecurityjson
SEC339MCP config: privileged Docker flagsMCP configuration launches Docker with a host-escape or privileged runtime flagthreat-reviewsecurityjson

Why It Matters ​

An MCP launcher that runs chmod 777-style commands can weaken host file protections through shared committed config.

What Triggers ​

SEC664 matches MCP command definitions that run insecure chmod modes such as 777, 0777, or symbolic world-writable modes like a+rwx.

False Positives ​

Quick local setup scripts sometimes do this, but shared MCP config should not silently broaden host write access.

Remediation ​

Replace broad chmod modes with the minimum required permissions and keep risky host permission changes out of shared MCP launch paths.