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Rule Reference

SEC665lintai-ai-securitystablejsonwarn

MCP config: setuid or setgid manipulation

MCP configuration command manipulates setuid or setgid permissions

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 MCP launch paths for explicit setuid or setgid chmod payloads.

Deterministic signal basis

JsonSignals command-plus-args analysis over ArtifactKind::McpConfig for chmod octal modes with setuid/setgid bits or symbolic modes such as `u+s` and `g+s`.

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

Setuid and setgid bits can create privilege-escalation paths from shared MCP-launched commands.

What Triggers ​

SEC665 matches MCP command definitions that run chmod with setuid/setgid octal modes such as 4755, 2755, 6755, or symbolic modes like u+s and g+s.

False Positives ​

Low-level packaging flows may use these modes intentionally, but shared MCP config should not install privileged binaries implicitly.

Remediation ​

Remove setuid/setgid manipulation from the MCP config or isolate it into a separately reviewed administrative server definition.