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Security audit

Shelly Plug S Gen3

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed device contract for a Shelly smart plug and does not contain hidden code, install hooks, or unrelated data access.

Install only in a SmartClaws setup where you intend agents to read telemetry from and, if enabled, switch a Shelly Plug S Gen3. Confirm the command channel and device authority are configured for the specific plug you want controlled, and keep credentials out of logs as the skill instructs.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 137)May include surrounding context.

md
- Call Shelly RPC directly.
- Treat plug internal temperature as room temperature.
- Re-send commands repeatedly without checking recent telemetry/decision state.

## Bridge-Agent Use